CN102308486B - Method and apparatus for generating expansion channel - Google Patents
Method and apparatus for generating expansion channel Download PDFInfo
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- CN102308486B CN102308486B CN201180001371.6A CN201180001371A CN102308486B CN 102308486 B CN102308486 B CN 102308486B CN 201180001371 A CN201180001371 A CN 201180001371A CN 102308486 B CN102308486 B CN 102308486B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M11/00—Telephonic communication systems specially adapted for combination with other electrical systems
- H04M11/06—Simultaneous speech and data transmission, e.g. telegraphic transmission over the same conductors
- H04M11/062—Simultaneous speech and data transmission, e.g. telegraphic transmission over the same conductors using different frequency bands for speech and other data
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- H—ELECTRICITY
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Abstract
The invention discloses a method and an apparatus for generating an expansion channel. The method comprises the steps of using twisted-pair wire channels in the amount of n, and generating expansion channels in the amount of m by means of different schemes. Each scheme of the different schemes generates expansion channels in the amount of m, wherein n is more than 2, and m is no more than (n-1). The expansion channel is divided into a non-cascade expansion channel and a cascade expansion channel. The method comprises the steps of respectively acquiring the total performance parameter value of expansion channels in the amount of m generated in different schemes; making a comparison of the total performance parameter values of expansion channels in the amount of m generated in different schemes and selecting a scheme corresponding to a non minimum value P. With the invention, a better or best expansion channel scheme can be selected in an intelligent manner, and thereby the expansion channel can have a better performance and SuperMIMO can have a better performance.
Description
Technical field
The present invention relates to data communication field, specifically, relate to the method and apparatus of generating expansion channel.
Background technology
Twisted-pair feeder is that the wire by two mutually insulateds is intertwined mutually according to certain specification and a kind of general distribution made, belongs to communication network transmission medium.Twisted-pair feeder is divided into Shielded Twisted Pair STP (Shielded Twisted Pair) and unshielded twisted pair UTP (Unshielded Twisted Pair).UTP is widely used in Etherloop and telephone wire, and a kind of UTP being comprised of the transmission line of four pairs of different colours is usually used in Ethernet data transmission.In trunk circuit, generally by many UTP lines, (as 25 pairs, 100 pairs or more) are combined to composition cable.The technology that transmits signal based on UTP is varied, wherein,, there is application foundation widely in the technology such as Asymmetrical Digital Subscriber Line ADSL (Asymmetric Digital Subscriber Line), high bitrate digital subscriber line road HDSL (High bit Rate DSL), superelevation speed digital subscriber line VDSL (Very High Speed Digital Subscriber Line).For convenience, the technology such as ADSL, HDSL and VDSL are referred to as to xDSL technology.
The xDSL technology that tradition transmits signal based on UTP, carrys out signal transmission to UTP as N channel using N conventionally.Along with further developing of high speed business, the traffic capacity of xDSL technology, with and the access rate that provides, can not meet gradually user's demand.For this reason, prior art has proposed a kind of method of extended channel, the mode that adopts series connection common mode N to the basis of the N of a UTP channel on, expand N-1 channel, make channel quantity after expanding reach 2N-1 individual.The method expands a new channel between every two couples of adjacent UTP, the transmission means of original channel is constant, still use the difference DM (Differential Mode) of this channel to carry out signal transmission, signal transmission on extended channel is divided into two parts, the common mode CM (Common Mode) that use to generate respectively two original channels of this extended channel transmits, and at receiving terminal, the common-mode signal on these two channels is done to the be expanded signal of channel of difference.
Between multipair twisted-pair feeder in a bundle cable, and all exist and crosstalk between twisted-pair feeder channel and extended channel, crosstalk and can make the performance of xDSL greatly reduce.Can use the technology for eliminating of crosstalking, by the elimination of crosstalking of interchannel.Existing vector quantization Vector technology, can eliminate crosstalking of interchannel, and xDSL performance is promoted greatly.
For higher access rate is provided to user, conventionally the multipair twisted-pair feeder resource from P1 to PN is bound, utilize a plurality of transceivers to combine and receive and send, combined transceiving coordinates above-mentioned channel expansion technology, and the technology for eliminating of crosstalking, just formed super multiple-input and multiple-output Digital Subscriber Line SuperMIMODSL (Super Multiple-input and Multiple-output Digital Subscriber Line) transmission system as shown in Figure 1.
The CO of central office (Central Office) access device Digital Subscriber Line Access Multiplexer DSLAM (Digital Subscriber Line Access Multiplexer) to the connection of user side equipment CPE (Customer Premises Equipment) as shown in Figure 2.DSLAM is connected to main-frame MDF (Main Distribution Frame) by cable, has splicing ear to switch and make local side apparatus connect the not collinear right of main cable on MDF.Main cable generally forms by much tying cable, 100 pairs of even more twisted-pair feeders of every bundle, and therefore, it is several thousand even up to ten thousand to subscribers feeder that MDF is generally connected with, i.e. twisted-pair feeder.The scale of distribution cable is less than main cable, generally has hundreds of to subscribers feeder, and distribution cable is connected with main cable by cross-connecting box, and same, cross-connecting box also has splicing ear can switch the order of connection.Finally, subscribers feeder arrives ustomer premises access equipment CPE by junction box.If use SuperMIMO technology, at least need 2 lines to arriving user's side.
Because MDF and cross-connecting box have splicing ear to switch, thus DSLAM to user's side through which to subscribers feeder can select, can be different.Generally, before activating the service, operator has just completed the connection of MDF and cross-connecting box, uses which user just to determine activating the service, can use these definite subscribers feeder carry out channel expansion.If the subscribers feeder line that will use definite user, to before, can be selected the subscribers feeder that will be used from the subscribers feeder of the subscribers feeder logarithm more than using, then, based on these, determine that the subscribers feeders that will use carry out channel expansion.
Prior art provides the method for extended channel in SuperMIMO system, but, based on twisted-pair feeder channel, channel is expanded to obtain the channel expansion scheme of extended channel of requirement and type if not unique, different extended channel schemes have different performances, and adopting the bad extended channel of performance to generate scheme can impact offering terminal use's service quality.
Summary of the invention
In SuperMIMO system, adopt the bad extended channel of performance to generate scheme and can cause SuperMIMO overall system performance not high, affect the speed of SuperMIMO system.
On the one hand, embodiments of the invention provide a kind of method of generating expansion channel, comprising:
Use n twisted-pair feeder channel, adopt respectively different schemes to generate a different m extended channel, each scheme in described different schemes generates m extended channel, wherein, n > 2, m≤n-1, wherein, extended channel is divided into non-cascade extended channel and cascade extended channel, each non-cascade extended channel is generated by two twisted-pair feeder channels, each 1 grade of cascade extended channel is generated by two non-cascade extended channels, or, by a non-cascade extended channel and a twisted-pair feeder channel, generated, each L level cascade extended channel, wherein L > 1, by two L-1 level cascade extended channels, generated, or, by a L-1 level cascade extended channel and a non-cascade extended channel, generated, or, by a L-1 level cascade extended channel and a twisted-pair feeder channel, generated, or, by a L-1 level cascade extended channel and a L-i level cascade extended channel, generated, wherein i > 1,
Obtain respectively the Performance Parameters value of m the extended channel generating under described different schemes;
The Performance Parameters value of the m generating under a more described different schemes extended channel, and select the scheme that one of them non-minimum value P is corresponding.
On the other hand, embodiments of the invention provide a kind of method of generating expansion channel, comprising:
Using n twisted-pair feeder channel to carry out in channel expansion process, wherein, n > 2, while using two channels to generate an extended channel, measures respectively the crossfire value that forms two interchannels of this channel combination in different channel combinations;
More described crossfire value, and select in described crossfire value two channel generating expansion channels in channel combination corresponding to non-minimum value.
On the other hand, embodiments of the invention provide a kind of device of generating expansion channel, comprising:
Extended channel generation unit, be used for using n twisted-pair feeder channel, adopt respectively different schemes to generate a different m extended channel, each scheme in described different schemes generates m extended channel, wherein, n > 2, m≤n-1, m extended channel comprises at least one extended channel, wherein, extended channel is divided into non-cascade extended channel and cascade extended channel, each non-cascade extended channel is generated by two twisted-pair feeder channels, each 1 grade of cascade extended channel is generated by two non-cascade extended channels, or, by a non-cascade extended channel and a twisted-pair feeder channel, generated, each L level cascade extended channel, wherein L > 1, by two L-1 level cascade extended channels, generated, or, by a L-1 level cascade extended channel and a non-cascade extended channel, generated, or, by a L-1 level cascade extended channel and a twisted-pair feeder channel, generated, or, by a L-1 level cascade extended channel and a L-i level cascade extended channel, generated, wherein i > 1,
Performance parameter obtains unit, for obtaining respectively the Performance Parameters value of m the extended channel generating under described different schemes;
Selected cell, for the Performance Parameters value of m extended channel generating under more described different schemes, and selects one of them non-minimum value P
1corresponding scheme.
On the other hand, embodiments of the invention provide a kind of device of generating expansion channel, comprising:
Twisted-pair feeder channel selected cell, for select at random respectively n twisted-pair feeder channel of various combination from N twisted-pair feeder channel, wherein n > 2, N > n;
Middle scheme selected cell, be used for using n twisted-pair feeder channel, adopt respectively different schemes to generate a different m extended channel, each scheme in described different schemes generates m extended channel, wherein, n > 2, m≤n-1, m extended channel comprises at least one extended channel, wherein, extended channel is divided into non-cascade extended channel and cascade extended channel, each non-cascade extended channel is generated by two twisted-pair feeder channels, each 1 grade of cascade extended channel is generated by two non-cascade extended channels, or, by a non-cascade extended channel and a twisted-pair feeder channel, generated, each L level cascade extended channel, wherein L > 1, by two L-1 level cascade extended channels, generated, or, by a L-1 level cascade extended channel and a non-cascade extended channel, generated, or, by a L-1 level cascade extended channel and a twisted-pair feeder channel, generated, or, by a L-1 level cascade extended channel and a L-i level cascade extended channel, generated, wherein i > 1, obtain respectively the Performance Parameters value of m the extended channel generating under described different schemes, the Performance Parameters value of the m generating under a more described different schemes extended channel, and select the scheme that one of them non-minimum value P is corresponding,
Final scheme selected cell, for non-minimum value P corresponding to n twisted-pair feeder channel of more described various combination and select the scheme of one of them non-minimum value.
On the other hand, embodiments of the invention provide a kind of device of generating expansion channel, comprising:
Measuring unit, for using n twisted-pair feeder channel to carry out channel expansion process, wherein, n > 2, while using two channels to generate an extended channel, measure respectively the crossfire value of two interchannels of this channel combination of composition in different channels combination;
Selected cell, for more described crossfire value, and selects in described crossfire value two channel generating expansion channels in channel combination corresponding to non-minimum value.By embodiments of the invention, can choose intelligently and select a kind of more excellent or optimum extended channel scheme, make extended channel have better performance, thereby make SuperMIMO system there is good performance.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme of the embodiment of the present invention, below the accompanying drawing of required use during embodiment is described is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is SuperMIMO DSL transmission system schematic diagram
Fig. 2 is that DSLAM is to the connection diagram of CPE
Fig. 3 is channel expansion method schematic diagram in the embodiment of the present invention
Fig. 4 is spreading channel signals transmission schematic diagram in the embodiment of the present invention
Fig. 5 is multiple channel expansion scheme schematic diagram in the embodiment of the present invention
Fig. 6 is multiple channel expansion scheme schematic diagram in the embodiment of the present invention
Fig. 7 is the schematic diagram of generating expansion channel method in the embodiment of the present invention
Fig. 8 is that in the embodiment of the present invention, common-mode signal is processed schematic diagram
Fig. 9 is SuperMIMO channel initialization schematic flow sheet in the embodiment of the present invention
Figure 10 is a kind of electronic switching circuit schematic diagram in the embodiment of the present invention
Figure 11 is the schematic diagram of generating expansion channel method in the embodiment of the present invention
Figure 12 is the schematic diagram of generating expansion channel method in the embodiment of the present invention
Figure 13 is the schematic diagram of generating expansion channel method in the embodiment of the present invention
Figure 14 is the schematic diagram of generating expansion channel device in the embodiment of the present invention
Figure 15 is the schematic diagram of generating expansion channel device in the embodiment of the present invention
Figure 16 is the schematic diagram of generating expansion channel device in the embodiment of the present invention
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Embodiment based in the present invention, those of ordinary skills, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
While carrying out channel expansion based on twisted-pair feeder channel, the extended channel generating is divided into non-cascade extended channel and cascade extended channel, if two channels for generating expansion channel are all twisted-pair feeder channels, the extended channel generating is so just non-cascade extended channel NCEC (Non-cascading Extended Channel); If two channels for generating expansion channel have one to be extended channel, the extended channel generating is so exactly cascade extended channel CEC (Cascading Extended Channe1).Non-cascade extended channel is generated by two twisted-pair feeder channels, 1 grade of cascade extended channel is generated by two non-cascade extended channels, or generated by a non-cascade extended channel and a twisted-pair feeder channel, be greater than 1 L level cascade extended channel, by two L-1 level cascade extended channels, generated, or, by a L-1 level cascade extended channel and a non-cascade extended channel, generated, or, by a L-1 level cascade extended channel and a twisted-pair feeder channel, generated, or, by a L-1 level cascade extended channel and a L-i level cascade extended channel, generated, above-mentioned L > 1, i > 1.
While realizing NCEC and CEC with centre tap, can do difference by the common-mode signal on the centre tap of two channels, generate an extended channel.Use said method, can be by being more than or equal to a random natural number n twisted-pair cable of 2 to generating n-1 NCEC or CEC extended channel, each twisted-pair cable is to a twisted-pair feeder channel of correspondence.
As shown in Figure 3, with 4 couples of twisted-pair feeder P1, P2, P3 and P4, generate the circuit of 7 channels.Wherein, P1, P2, P3, P4 are connected with the output of transformer 1, transformer 2, transformer 3, transformer 4 respectively at transmitting terminal, and be connected at the input of receiving terminal and corresponding transformer, 3 in figure and 4 be two inputs or two outputs of indication transformers respectively; It is common differential mode twisted-pair feeder channel that DM1, DM2, DM3, DM4 are 4, by the centre tap 5 of transformer 1 and transformer 2, by DM1 and DM2, generates NCEC1 channel, and NCEC1 inputs by transformer 5 at transmitting terminal; By the centre tap 5 of transformer 3 and transformer 4, by DM3 and DM4, generate NCEC2 channel, NCEC2 inputs by transformer 6 at transmitting terminal, by the centre tap 5 of transformer 5 and transformer 6, by NCEC1 and NCEC2, generate CEC channel, CEC inputs by transformer 7 at transmitting terminal.
How Fig. 4 transmits at twisted-pair feeder from the channel signal of signal aspect explanation expansion, 4 couples of corresponding 4 twisted-pair feeder channel P of UTP
1, P
2, P
3and P
4, expansion obtains two NCEC channels: NCEC1 channel and NCEC2 channel, and a CEC channel.Wherein, the signal that NCEC1 channel, NCEC2 channel and CEC channel send at transmitting terminal is respectively x
1, x
2and x
3, the signal of receiving at receiving terminal is respectively y
1, y
2and y
3.Transmitted signal on each extended channel is all divided into equal and opposite in direction, two signals of opposite direction, and transmit as the common-mode signal of twisted-pair feeder channel.Wherein, the x on NCEC1 channel
1be divided into+x of signal
1/ 2 and-x
1/ 2, respectively as P
1the common-mode signal of channel and P
2the common-mode signal of channel is transmitted.X on NCEC2 channel
2be divided into+x of signal
2/ 2 and-x
2/ 2, respectively as P
3the common-mode signal of channel and P
4the common-mode signal of channel is transmitted.X on CEC channel
3be divided into+x of signal
3/ 2 and-x
3/ 2, as the common-mode signal of NCEC1 channel and the common-mode signal of NCEC2 channel, transmit respectively, wherein, be divided into+x during through NCEC1 channel
3/ 4 and+x
3/ 4, respectively as P
1the common-mode signal of channel and P
2the common-mode signal of channel is transmitted, be divided into-x during through NCEC2 channel
3/ 4 and-x
3/ 4, respectively as P
3the common-mode signal of channel and P
4the common-mode signal of channel is transmitted.Sending and receiving to the common mode channel of every pair of twisted-pair feeder is to realize by the centre tap of the transformer in connection layout 1.Centre tap transmission X signal to transformer will respectively produce the signal of X/2 on the circuit that connects both sides tap, thereby reach the object that sends common-mode signal.
As shown in Figure 5, differential mode generating expansion channel by common-mode signal, if have 4 twisted-pair cables to P1, P2, P3, P4, need the extended channel generating to be: 2 non-cascade extended channels, 11 grade of cascade extended channel and this 1 grade of cascade extended channel are generated by 2 non-cascade extended channels, under this pattern, 4 lines are to there being generation schemes different in 3:
501: with P1, P4 generates NCEC1, P2, P3 generates NCEC2, and NCEC1 and NCEC2 generate CEC.
502: with P1, P2 generates NCEC1, P3, P4 generates NCEC2, and NCEC1 and NCEC2 generate CEC.
503: with P1, P3 generates NCEC1, P2, P4 generates NCEC2, and NCEC1 and NCEC2 generate CEC.
Certainly, the extended channel of required generation can be also: 1 non-cascade extended channel, 11 grade of cascade extended channel being generated by non-cascade extended channel and twisted-pair feeder channel, 1 by 11 grade of cascade extended channel and 12 grades of cascade extended channel that twisted-pair feeder channel generates, under this kind of pattern, can there be 3 kinds of generation schemes as shown in Figure 6:
601: with P1, P4 generates NCEC1, P2 and NCEC1 generate CEC1, and CEC1 and P 3 generate CEC2.
602: with P1, P4 generates NCEC1, P3 and NCEC1 generate CEC1, and CEC1 and P2 generate CEC2.
603: with P1, P3 generates NCEC1, P2 and NCEC1 generate CEC1, and CEC1 and P4 generate CEC2.
As scheme in 3 in 3 kinds of schemes in Fig. 5 and Fig. 6, although all generated 3 extended channels, but the performance of the extended channel generating may be different, and embodiments of the invention provide the method for selecting the more excellent scheme of a kind of performance from different extended channel schemes.
After user's distribution is determined, determined the n being used by CPE twisted-pair feeder channel, can adopt the method 700 shown in Fig. 7, the good scheme of performance that selection will be used in the different schemes of this n twisted-pair feeder channel generating expansion channel, the method comprises:
701: use n twisted-pair feeder channel, adopt respectively different schemes to generate a different m extended channel, each scheme in described different schemes generates m extended channel, wherein, n > 2, m≤n-1;
703: the Performance Parameters value that obtains respectively m the extended channel generating under described different schemes;
705: the Performance Parameters value of the m generating under a more described different schemes extended channel, and select the scheme that one of them non-minimum value P is corresponding.
Between different schemes in 701, can there is identical pattern, be between different scheme: the number of non-cascade extended channel is identical, and the number of 1 grade of cascade extended channel is identical and to generate the type of two channels of each 1 grade of cascade extended channel respectively identical, and the number of other L level cascade extended channel of each grade is identical, rank identical and these two channel cascade extended channels is identical respectively respectively for the type of two channels generating this L level cascade extended channel.For example, 3 scheme modes in Fig. 5 are identical, and 3 scheme modes in Fig. 6 are identical.Certainly, between different schemes, also can there is different patterns, for example 601 in 501 in Fig. 5 and Fig. 6.
Take Fig. 5 as example, with 4 twisted-pair feeder channels can generate comprise 2 NCEC and 1 CEC 3 extended channels, 501,502,503 represent different schemes, it is different in each scheme, generating the channel combination that 3 extended channels adopt, between these three schemes, generate NCEC1, NCEC2, CEC and all adopted respectively the combination of different channel, for example, the channel combination that generates NCEC1 in 501 is P1 and P4, the channel combination that generates NCEC1 in 502 is P1 and P2, and in 503 is P1 and P3.
Take Fig. 6 as example again, with 4 twisted-pair feeder channels, can generate 3 extended channels that comprise 1 NCEC and 2 CEC, 601, the 602, the 603rd, different schemes, between 601 and 602, the channel combination that generates NCEC1 is identical, be all P1 and P4, the channel combination that still generates CEC1 is different, and the channel combination that generates CEC2 is also different.Between 601 and 603, although CEC1 is generated by NCEC1 and P2, owing to generating the channel combination of NCEC1 employing, be different, the channel combination that therefore generates CEC1 is also different.
Shown in Fig. 5 and Fig. 6 is all with 4 twisted-pair feeder channels, to generate the situation of 3 extended channels, can certainly only generate 2 NCEC with 4 twisted-pair feeder channels, or only generate 1 NCEC and 1 CEC, under these two kinds of situations, also can have the scheme of different generating expansion channels.
When the n p power that is 2, p >=2 wherein, while generating n-1 extended channel, use n all twisted-pair feeder channels to generate between two non-cascade extended channel, use all non-cascade extended channels to generate between two 1 grade of cascade extended channel, each 1 grade of cascade extended channel is only generated by two non-cascade extended channels, since 1 grade of cascade extended channel, if this grade of cascade extended channel is not 1, use this grade of all cascade extended channels to generate between two more higher leveled cascade extended channel, the rest may be inferred, until the highest cascade extended channel generating only has 1, each L level cascade extended channel is only generated by two L-1 level cascade extended channels, can there be a plurality of different schemes can carry out in a manner mentioned above channel expansion, can obtain respectively the Performance Parameters of n-1 the extended channel generating under different schemes, therefrom select a non-minimum corresponding scheme in Performance Parameters value, preferably, non-minimum value is maximum.
When described n twisted-pair feeder channel only connected the one end in the CO of central office (Central Office) or subscriber terminal equipment CPE (Customer Premises Equipment), can obtain respectively by method hereinafter described the Performance Parameters value of m the extended channel generating under described different schemes.
The characteristic right due to each line is not exclusively the same, therefore, and can be than the DM bad channel of general twisted-pair power cable to the extended channel degree of balance performance forming by two lines.The degree of balance can be weighed with longitudinal balance degree LB (Longitudinal Balance).Except longitudinal balance degree, the measurement of line balance also has longitudinal conversion ratio LCL (Longitudinal conversion Loss) etc.The degree of balance of circuit is a key factor that affects signal transmission, therefore, when selecting extended channel, can select the extended channel that the degree of balance is good.
Take Fig. 5 as example, during employing scheme 501, measure respectively the longitudinal balance degree of NCEC1, NCEC2, CEC; Be switched to scheme 502, measure the longitudinal balance degree of each extended channel; Be switched to scheme 503, measure the longitudinal balance degree of each extended channel, calculate respectively the longitudinal balance degree sum of each extended channel in 3 schemes, the longitudinal balance degree sum of gained can be used as the Performance Parameters that characterizes 3 extended channels that generate.The scheme of the non-minimum of longitudinal balance degree sum can be selected, preferably, the scheme of longitudinal balance degree sum maximum can be selected.
Crosstalking between the extended channel generating is less, influencing each other between them is also just less, therefore, can to the performance of extended channel, assess by measuring crosstalking between a plurality of extended channels that generate under different schemes, and then the off-peak extended channel scheme of totally crosstalking between selection extended channel, preferably, can select the minimum scheme of totally crosstalking.
Crosstalk and comprise near-end cross NEXT (Near End Crosstalk) and far-end cross talk FEXT (Far End Crosstalk).Crosstalking can be that differential mode is crosstalked, and namely on a channel, sends out difference mode signal, receives differential mode crosstalk signal on other channel/circuits.In the embodiment of the present invention, said crosstalking except use differential mode is crosstalked, also can be used common mode crosstalk, is exactly on a channel/circuit, to send out common-mode signal, receives common mode crosstalk signal on other channel/circuits.Using the benefit of common mode crosstalk is that common mode crosstalk is crosstalked stronger than differential mode, more easily measured.
Take Fig. 5 as example, be switched to scheme 501, measure NCEC1, NCEC2, crosstalking between CEC; Equally, be switched to scheme 502,503, measure NCEC1, NCEC2, crosstalking between CEC, calculates the sum of crosstalking between the extended channel recording under different schemes, and the inverse of this sum of crosstalking can be used as the parameter of the overall performance that characterizes extended channel.When n twisted-pair feeder channel only connected the one end in CO or CPE, crosstalking of measurement can be that near-end common mode crosstalk or the near-end differential mode of link crosstalked.Can select the inverse of each channel interference sum, or the scheme of the non-minimum of inverse of the energy sum of crosstalking, preferably, can select the scheme of Performance Parameters maximum.
When n twisted-pair feeder channel both connected CO, while also having connected CPE, the acquisition of describing in 703 characterizes the performance parameter value of the overall activation rate of m extended channel, except can be from any one link be measured longitudinal balance degree and near-end cross, can also measure the far-end cross talk of each extended channel, activation rate, achievable rate, signal to noise ratio, the performance index such as decay, and correspondingly use the inverse of the sum of crosstalking, activation rate sum, achievable rate sum, signal to noise ratio sum, the inverse of decay sum is used as characterizing the Performance Parameters of m extended channel.
Concrete measuring process described above can adopt DSL nest plate to realize.
Specific to adopting respectively different schemes to generate m extended channel described in 701, can adopt similar device as shown in Figure 8 to realize.Fig. 8 be take 4 lines to being example, line is connected with 4 with the output 3 of transformer 1, transformer 2, transformer 3, transformer 4 respectively to P1, P2, P3, P4, each transformer centre tap 5 is connected with each common-mode signal transceiver respectively, and modular converter is obtained the common-mode signal of each twisted-pair feeder channel and common-mode signal is processed to rear generating expansion channel by common-mode signal transceiver.The mode of in control module control modular converter, common-mode signal being carried out to digital processing is to obtain respectively different channel expansion schemes.Control module can be used DSL nest plate to realize.After extended channel scheme is determined, can be by selected extended channel scheme notice opposite end.
Existing DSL initialization flow process comprises handshake phase, channel discovery phase, training stage, Multiple Channel Analysis and mutual stage.Existing DSL traffic channel initialization procedures is the initialization for a DSL channel.SuperMIMO initialization is multi channel associating initialization procedure.At SuperMIMO initial phase, in SuperMIMO, a plurality of channels carry out initialization simultaneously.
In SuperMIMO initialization procedure, the initialization of channel can comprise that an extended channel scheme determines the stage.An example of SuperMIMO traffic channel initialization procedures, as shown in Fig. 9 900, comprises that SuperMIMO handshake phase 901, extended channel scheme determine stage 903, channel discovery phase, training stage, Multiple Channel Analysis and mutual stage.Can carry out mutual SuperMIMO user basic information in SuperMIMO handshake phase 901.
Further, channel expansion information can be at capabilities list CL (Capabilities List), capabilities list+request CLR (Capabilities List+Request), mode request MR (Model Request), model selection MS (Model Select), in the message such as schema recommendation MP (Mode Proposal), transmit, transceiver obtains the channel expansion information of opposite end from the other side's message of receiving, and sends message and respond.In channel expansion information, the twisted-pair feeder logarithm parameter that SuperMIMO user uses is used for notifying modular converter, obtain the common-mode signal of which twisted-pair feeder for building extended channel, whether will use the extended channel generating mode parameter of cascade for notifying modular converter, whether use CEC channel.If without CEC, so only generate NCEC, NCEC generates the complete expansion generation CEC that later no longer continues.
The generating expansion channel of employing different schemes respectively described in 701, also can adopt the mode of similar electronic switch as shown in figure 10 to realize.Take that to realize extended channel schemes different in Fig. 5 be example, the on off state of 1001 shown in Figure 10,1002,1,003 three switches forms a Switch State Combination in Power Systems, represent that P1 and P2 form NCEC1, P3 and P4 form NCEC2, channel expansion scheme 502 in corresponding diagram 5, control unit is controlled the on off state of three switches.Above-mentioned 3 switches also can adopt respectively other Switch State Combination in Power Systems with the scheme of 501,503 in corresponding diagram 5.Therefore, corresponding certain scheme, can control the on off state of one group of each switch in electronic switch to generate each extended channel.For different schemes, can control one group of electronic switch adopts different Switch State Combination in Power Systems to realize different schemes, in one group of electronic switch, the on off state of each electronic switch forms a Switch State Combination in Power Systems, the corresponding different schemes of different Switch State Combination in Power Systems, different Switch State Combination in Power Systems is corresponding one by one with different schemes, between different Switch State Combination in Power Systems, in one group of electronic switch, the on off state of each electronic switch is incomplete same.Electronic switch is a kind ofly can control the device that is communicated with different pins by program or physical button.
Channel expansion Scheme Choice process described above can be in 900 realizes in the initialization procedure of SuperMIMO, for example, can be after SuperMIMO handshake phase, before channel discovery phase, use n the twisted-pair feeder channel that will be used by CPE, adopt different schemes to generate a different m extended channel, the scheme of the non-minimum of Performance Parameters of m the extended channel that selection generates, then carries out initialization to the extended channel generating under this scheme.Preferably, can select the scheme of population parameter value maximum.
Before determining distribution, when the twisted-pair feeder that user CPE will be used is not also determined, available twisted-pair cable is greater than and needs the twisted-pair cable using to quantity n quantity N, can select from N line centering n line pair of various combination, to the n of a various combination line pair, adopt above-mentioned method to select a scheme, then compare the scheme of selecting under various combination, more therefrom select a scheme.Can before activating the service, operator carry out circuit selection, to make as far as possible user obtain good performance.
While carrying out above-mentioned selection circuit, because distribution is not also determined, CPE does not generally have to connect, and the signal that can send by the CO of central office (Central Office) DSLAM is selected.
N described in 701 twisted-pair feeder channel can be selected at random from N twisted-pair feeder channel, and extended channel Scheme Choice process may further include following processing as shown in figure 11:
1101: from described N twisted-pair feeder channel, select at random M group twisted-pair feeder channel, wherein M > 1, every group comprises n twisted-pair feeder channel, the n of every group twisted-pair feeder channel is all different from described n twisted-pair feeder channel, n twisted-pair feeder channel in every group selected to corresponding scheme corresponding to non-minimum value, and non-minimum value corresponding to k group is P
k, k=1,2...M.Preferably, can select scheme corresponding to maximum.
1103: more described P and P
1, P
2... P
mand select scheme corresponding to one of them non-minimum value.Preferably, can select scheme corresponding to maximum.
Because twisted-pair feeder channel has connected CO, can obtain the parameter that characterizes the extended channel overall performance generating by measuring the longitudinal balance degree of extended channel; Or when the extended channel generating is greater than 1, can measures near-end common mode crosstalk or the near-end differential mode of the CO end between extended channel and crosstalk, obtain the parameter that characterizes the extended channel overall performance generating.
In generating expansion channel process, can be used for generating crosstalking between two extended channels of an extended channel by measurement, any select to generate an extended channel with two extended channels, the method of a kind of extended channel that embodiments of the invention provide is as shown in Figure 12 1200, and the method comprises:
1201: using n twisted-pair feeder channel to carry out in channel expansion process, wherein, n > 2, while using two channels to generate an extended channel, measures respectively the crossfire value of two interchannels of this channel combination of composition in different channels combination;
1203: the crossfire value relatively recording, and select in described crossfire value two channel generating expansion channels in channel combination corresponding to non-minimum value.
Further, different channel described in 1201 forms this channel combination two channels in combining are all two twisted-pair feeder channels, and described two twisted-pair feeder channels can generate a non-cascade extended channel; Or, be all a twisted-pair feeder channel and a non-cascade extended channel, a described twisted-pair feeder channel and a non-cascade extended channel can generate 1 grade of cascade extended channel; Or, be all two non-cascade extended channels, described two non-cascade extended channels can generate 1 grade of cascade extended channel; Or, be all two L-1 level cascade extended channels, wherein L > 1, and described two L-1 level cascade extended channels can generate a L level cascade extended channel; Or, be all a L-1 level cascade extended channel and a twisted-pair feeder channel, wherein L > 1, and a described L-1 level cascade extended channel and a twisted-pair feeder channel can generate a L level cascade extended channel; Or, be all a L-1 level cascade extended channel and a non-cascade extended channel, wherein L > 1, and a described L-1 level cascade extended channel and a non-cascade extended channel can generate a L level cascade extended channel; Or, all a L-1 level cascade extended channel and a L-i level cascade extended channel, wherein L > 1, i > 1, and a described L-1 level cascade extended channel and a L-i level cascade extended channel can generate a L level cascade extended channel.
Take Fig. 5 as example, adopt 4 twisted-pair cables to generating 3 extended channels, 2 non-cascade extended channels that generate for twisted-pair feeder channel wherein, 1 is two cascade extended channels that non-cascade extended channel generates, in these 3 extended channels, while generating first non-cascade extended channel NCEC1, can there is different channel combination producing NCEC1, these different channels combinations comprise P1 and P4, P1 and P3, P1 and P2, P2 and P3, P2 and P4, P3 and P4, while generating NCEC1, can measure crosstalking of two twisted-pair feeder interchannels in the combination of these different channels, and compare and measure the crossfire value obtaining, a channel combination producing NCEC1 of non-minimum selects to crosstalk from these crossfire values, preferably, can select the combination of crossfire value maximum.
Take Fig. 6 as example again, and the different channel combination that generates NCEC1 comprises P1 and P4, P1 and P3, P1 and P2, P2 and P3, P2 and P4, P3 and P4, while generating NCEC1, can measure crosstalking of two interchannels in the combination of these different channels, and compare and measure the crossfire value obtaining, a channel combination producing NCEC1 of the non-minimum of selecting to crosstalk from these crossfire values, preferably, can select the combination of crossfire value maximum; Suppose that P1 and P4 combination are selected to generate NCEC1, the different channels combination that generates CEC1 has NCEC1 and P2, NCEC1 and P3, can measure crosstalking of two interchannels in these two kinds different channels combinations, and the crossfire value relatively recording, select the maximum combination producing CEC1 that crosstalks; After the channel that generates CEC1 combines and determines, the channel combination that generates CEC2 only has a kind of.
When the n p power that is 2, p >=2 wherein, while generating n-1 extended channel, use n all twisted-pair feeder channels to generate between two non-cascade extended channel, use all non-cascade extended channels to generate between two 1 grade of cascade extended channel, each 1 grade of cascade extended channel is only generated by two non-cascade extended channels, since 1 grade of cascade extended channel, if this grade of cascade extended channel is not 1, use this grade of all cascade extended channels to generate between two more higher leveled cascade extended channel, the rest may be inferred, until the highest cascade extended channel generating only has 1, each L level cascade extended channel is only generated by two L-1 level cascade extended channels.Can, in generating n-1 extended channel process, to each, can there is the extended channel of a plurality of different incompatible generations of channel group before generating, to adopt method as shown in figure 12 to select.3 powers with 2,8 twisted-pair feeder channels are example, can generate 7 extended channels, 4 non-cascade extended channels wherein, 21 grade of cascade extended channels, 12 grades of cascade extended channel.While generating front 3 non-cascade extended channels, there is different channel combinations available, while generating first 1 grade of cascade extended channel, also have different channel combinations available.
Further, while measuring the crossfire value described in 1201, when this n twisted-pair feeder channel has been connected to CO but has not been connected to CPE, can crosstalk at near-end common mode crosstalk or the near-end differential mode of CO side measurement CO end; When described n twisted-pair feeder channel has been connected to CO and CPE, can measure that far-end common mode crosstalk, far-end differential mode are crosstalked at CO end or cpe end, a kind of in crosstalking of near-end common mode crosstalk, near-end differential mode; When described n twisted-pair feeder channel, be not connected to CO but while being connected to CPE, can measure a kind of in crosstalking of near-end common mode crosstalk, near-end differential mode at cpe end.Can send reference signal by DSL nest plate, and measure and crosstalk.
In method shown in 1200, described n twisted-pair feeder channel can be after determining distribution, to have determined the twisted-pair feeder channel that will be connected to CPE.Also can be n twisted-pair feeder channel before distribution is determined, its quantity can be greater than the quantity of the twisted-pair feeder channel that need to be connected to CPE.
Before distribution is determined, available twisted-pair feeder channel quantity N is greater than the twisted-pair feeder channel quantity n being used by CPE, and embodiments of the invention provide a kind of method of selecting n twisted-pair feeder channel from N twisted-pair feeder channel, and detailed process as shown in figure 13, comprising:
1301: the crossfire value of measuring the different twisted-pair feeder channel combinations that form between two in not selected twisted-pair feeder channel in N twisted-pair feeder channel;
1303: the crossfire value of more different twisted-pair feeder channel combinations;
1305: choose two twisted-pair feeder channels in the combination of crossfire value maximum of different twisted-pair feeder channels combination;
1307: if the number of the twisted-pair feeder channel of choosing does not reach n, or, the number of the twisted-pair feeder channel of choosing does not reach n-1, repeat above process, until the number of the twisted-pair feeder channel of choosing reaches n, or, until the number of the twisted-pair feeder channel of choosing reaches n-1, from not selected twisted-pair feeder channel, random selection is 1, makes the twisted-pair feeder channel number of choosing reach n.
While selecting circuit, because distribution is not also determined, CPE does not generally have to connect, and the signal that can send by the CO of central office (Central Office) DSLAM is selected.Crosstalking in 1301 can be crosstalked for near-end common mode crosstalk or the near-end differential mode of CO end.
Embodiments of the invention provide a kind of device of extended channel, and as shown in Figure 14 1400, n represents n twisted-pair feeder channel, extended channel generation unit 1401 is used n twisted-pair feeder channel, adopts different schemes to generate respectively m extended channel, and wherein n > 2, m≤n-1, m
1and m
2represent wherein two extended channels that different schemes generates.The combination of channel that in m extended channel, each extended channel adopts is different, generates the channel combination that each extended channel adopts also not identical between different schemes, and m the extended channel therefore generating is not identical yet.
Performance parameter obtains the parameter P value that unit 1403 obtains respectively the overall performance that characterizes m extended channel under each different schemes, for example m
1and m
2the Performance Parameters value of a middle m extended channel is respectively P
1and P
2;
Further, performance parameter obtains unit 1403 can comprise measurement module 1407 and computing module 1409, after employing different schemes generates respectively m extended channel, when m >=1, measurement module can be measured respectively the performance parameter value of each extended channel in m the extended channel generating under described different schemes, described performance parameter value comprises longitudinal balance degree, activation rate, achievable rate, signal to noise ratio, decay inverse in a kind of, computing module calculates the performance parameter value sum of each extended channel in m the extended channel generating under described different schemes, described and as described Performance Parameters value, when m > 1, owing to can measuring crosstalking between extended channel, measurement module can also be measured respectively overall crossfire value or the overall crosstalk energy value between m the extended channel generating under described different schemes, computing module calculates the inverse of the reciprocal or overall crosstalk energy value of the overall crossfire value between m the extended channel generating under described different schemes, and the inverse of the reciprocal or overall crosstalk energy value of described overall crossfire value is as Performance Parameters.
Further, extended channel generation unit 1401 can comprise modular converter and control module as shown in Figure 8, modular converter obtains the common-mode signal of each twisted-pair feeder channel in n twisted-pair feeder channel, and the common-mode signal of n twisted-pair feeder is carried out generating m extended channel after digital processing; Control module control modular converter carries out digital processing mode to common-mode signal is to obtain respectively different channels expansion scheme.Control module can adopt DSL nest plate to realize.Extended channel generation unit can further include transceiver, for receive channel extend information, utilize described channel expansion information to carry out digital processing to generate the extended channel in different channels expansion scheme to described common-mode signal, described channel expansion information comprise twisted-pair cable that user uses to quantity, whether use the extended channel generating mode of cascade.
Device shown in 1400 can in CO, realize or CPE in realize.If realized in CO, in CO, can comprise modular converter, at modular converter, carry out digital processing, generate various extended channels.Modular converter can generate the scheme of at least two kinds of extended channels.CO can send message to CPE, measures after notifying the other side to be switched to corresponding extended channel generation scheme; Also can not notify CPE, CO is single-ended carries out the switching of extended channel scheme to obtain different extended channel generation schemes and to select.After CO completes extended channel selection, by the generating mode notice CPE of extended channel, CO and CPE carry out channel expansion according to the definite extended channel generation scheme of CO, and extended channel is carried out to initialization.
If realized in CPE, on CPE, comprise modular converter, at modular converter, carry out digital processing, generate various extended channels.Modular converter has the scheme of two kinds of generating expansion channels at least.CPE can send message to CO, measures after notifying the other side to be switched to corresponding extended channel generation scheme; CPE also can not notify CO, and the single-ended extended channel scheme of carrying out of CPE is switched and single-ended measurement; Also can be that CPE carries out the switching of channel approach under the control of CO, CO and CPE be switched to same channel expansion mode, then by CPE, are measured and determine scheme.After CPE completes extended channel selection, by the generating mode notice CO of extended channel, CO and CPE carry out channel expansion according to the definite extended channel generation scheme of CPE, and extended channel is carried out to initialization.
In addition, extended channel generation unit also can adopt similar mode as shown in figure 10 to realize, and extended channel generation unit comprises control module and one group of electronic switch.Control module is controlled one group of electronic switch and is adopted respectively different Switch State Combination in Power Systems to generate respectively m extended channel, the corresponding different schemes of different Switch State Combination in Power Systems.
Embodiments of the invention provide a kind of device of extended channel, as shown in Figure 15 1500, N represents N twisted-pair feeder channel, twisted-pair feeder channel selected cell 1501, from N twisted-pair feeder channel, select at random n twisted-pair feeder channel of various combination, wherein n > 2, N > n, n
1and n
2represent two different combinations;
Middle scheme selected cell 1503, for example, for being used n twisted-pair feeder channel, n of certain combination of selecting
1or n
2adopt different schemes to generate respectively m extended channel, wherein, m≤n-1, each scheme generates m extended channel, it is different in same scheme, generating the channel combination that in m extended channel, each extended channel adopts, and generates the channel combination difference that each extended channel adopts between different schemes; Obtain respectively the Performance Parameters P value that characterizes m extended channel under each different schemes, relatively P value corresponding to each scheme also therefrom selected a scheme that non-minimum value is corresponding, preferably, can select scheme corresponding to maximum.For example, in Figure 15, select scheme corresponding to maximum, combination n
1corresponding P
max1, n
2corresponding P
max2.
Final scheme selected cell 1505 is the non-minimum value corresponding to n twisted-pair feeder channel of various combination relatively, and according to comparative result, from these non-minimum values, select a scheme that non-minimum value is corresponding again, preferably, can select maximum.For example, in Figure 15, from comprising P
max1, P
max2in interior maximum, select again maximum P
max.
As shown in figure 16, embodiments of the invention provide a kind of extended channel device 1600, and this device comprises:
Measuring unit 1601, for using n twisted-pair feeder channel to carry out channel expansion process, wherein, n > 2, while using two channels to generate an extended channel, measure respectively the crossfire value of two interchannels of this channel combination of composition in different channels combination;
As seen from the above description, by embodiments of the invention, can choose intelligently and select a kind of preferably extended channel scheme, make extended channel have better performance, thereby make SuperMIMO system there is good performance.
Through the above description of the embodiments, those skilled in the art can be well understood to the mode that the present invention can add essential hardware platform by software and realize, and can certainly all by hardware, implement.Understanding based on such, what technical scheme of the present invention contributed to background technology can embody with the form of software product in whole or in part, this computer software product can be stored in storage medium, as ROM/RAM, magnetic disc, CD etc., comprise that some instructions are with so that a computer equipment (can be personal computer, server, or the network equipment etc.) carry out the method described in some part of each embodiment of the present invention or embodiment.
The above; be only the present invention's embodiment preferably, but protection scope of the present invention is not limited to this, is anyly familiar with in technical scope that those skilled in the art disclose in the present invention; the variation that can expect easily or replacement, within all should being encompassed in protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.
Claims (16)
1. a method for generating expansion channel, is characterized in that, comprising:
Use n twisted-pair feeder channel, adopt respectively different channels assembled scheme to generate a different m extended channel, each scheme in described different channels assembled scheme generates m extended channel, wherein, and n>2, m≤n-1, wherein, extended channel is divided into non-cascade extended channel and cascade extended channel, each non-cascade extended channel is generated by two twisted-pair feeder channels, each 1 grade of cascade extended channel is generated by two non-cascade extended channels, or, by a non-cascade extended channel and a twisted-pair feeder channel, generated, each L level cascade extended channel, L>1 wherein, by two L-1 level cascade extended channels, generated, or, by a L-1 level cascade extended channel and a non-cascade extended channel, generated, or, by a L-1 level cascade extended channel and a twisted-pair feeder channel, generated, or, by a L-1 level cascade extended channel and a L-i level cascade extended channel, generated, i>1 wherein,
Obtain respectively the Performance Parameters value of m the extended channel generating under described different channels assembled scheme;
The Performance Parameters value of m the extended channel generating under more described different channels assembled scheme, and select a scheme that non-minimum value P is corresponding in the Performance Parameters of m extended channel under described different channels assembled scheme.
2. the method for claim 1, is characterized in that, the described Performance Parameters value that obtains respectively m the extended channel generating under described different channels assembled scheme, comprising:
Measure respectively the performance parameter value of each extended channel in m the extended channel generating under described different channels assembled scheme, calculate the performance parameter sum of described each extended channel, described and as described Performance Parameters value, wherein, described performance parameter value comprises a kind of in the inverse of longitudinal balance degree, activation rate, achievable rate, signal to noise ratio, decay, wherein m >=1; Or,
Measure respectively overall crossfire value or overall crosstalk energy value between m the extended channel generating under described different channels assembled scheme, the inverse of the reciprocal or overall crosstalk energy value of described overall crossfire value is as described Performance Parameters value, wherein m>1.
3. method as claimed in claim 1 or 2, is characterized in that, the described different channels assembled scheme that adopts respectively generates a different m extended channel, comprising:
Obtain the common-mode signal of each twisted-pair feeder channel in described n twisted-pair feeder channel, control is carried out the mode of digital processing to obtain respectively described different channels assembled scheme to described common-mode signal, under described different channels assembled scheme, described common-mode signal is carried out to digital processing to generate m extended channel respectively.
4. method as claimed in claim 3, is characterized in that, further comprises:
Receive channel extend information, under described different channels assembled scheme, utilize respectively described information to carry out digital processing to generate m extended channel to described common-mode signal, described information comprise twisted-pair cable that user uses to quantity, whether generate cascade extended channel.
5. method as claimed in claim 1 or 2, is characterized in that, the described different channels assembled scheme that adopts respectively generates a different m extended channel, comprising:
Controlling one group of electronic switch adopts respectively different Switch State Combination in Power Systems to generate described different channels assembled scheme, described different Switch State Combination in Power Systems is corresponding one by one with described different channels assembled scheme, according to each Switch State Combination in Power Systems, control the state of each switch in described one group of electronic switch to generate m extended channel.
6. the method for claim 1, is characterized in that, in the traffic channel initialization procedures of super multiple-input and multiple-output Digital Subscriber Line, the extended channel generating under channel assembled scheme corresponding to described non-minimum value P is carried out to initialization.
7. the method for claim 1, is characterized in that, described n twisted-pair feeder channel selected at random from N twisted-pair feeder channel;
Further comprise:
From described N twisted-pair feeder channel, select at random M group twisted-pair feeder channel, M>1 wherein, every group comprises n twisted-pair feeder channel, the n of every group twisted-pair feeder channel is all different from described n twisted-pair feeder channel, n twisted-pair feeder channel in every group selected to corresponding channel assembled scheme corresponding to non-minimum value, and non-minimum value corresponding to k group is P
k, k=1,2...M; N in described every group twisted-pair feeder channel selected the non-minimum value of Performance Parameters that n twisted-pair feeder channel that corresponding non-minimum value is every group adopts m extended channel of different channels assembled scheme generation;
More described P and P
1, P
2... P
mand select channel assembled scheme corresponding to one of them non-minimum value.
8. a method for generating expansion channel, is characterized in that, comprising:
Using n twisted-pair feeder channel to carry out in channel expansion process, wherein, n>2, while using two channels to generate an extended channel, measures respectively the crossfire value that forms two interchannels of this channel combination in different channel combinations, wherein, extended channel is divided into non-cascade extended channel and cascade extended channel, each non-cascade extended channel is generated by two twisted-pair feeder channels, each 1 grade of cascade extended channel is generated by two non-cascade extended channels, or, by a non-cascade extended channel and a twisted-pair feeder channel, generated, each L level cascade extended channel, L>1 wherein, by two L-1 level cascade extended channels, generated, or, by a L-1 level cascade extended channel and a non-cascade extended channel, generated, or, by a L-1 level cascade extended channel and a twisted-pair feeder channel, generated, or, by a L-1 level cascade extended channel and a L-i level cascade extended channel, generated, i>1 wherein,
More described crossfire value, and select in described crossfire value two channel generating expansion channels in channel combination corresponding to non-minimum value.
9. method as claimed in claim 8, is characterized in that,
Described n twisted-pair feeder channel has been connected to the CO of central office but has not been connected to subscriber terminal equipment CPE, described in a kind of in crosstalking of the near-end common mode crosstalk, the near-end differential mode that comprise CO end that crosstalk; Or,
Described n twisted-pair feeder channel has been connected to CO and CPE, described in crosstalk that far-end common mode crosstalk, the far-end differential mode that comprises CO end or cpe end crosstalked, a kind of in crosstalking of near-end common mode crosstalk, near-end differential mode; Or,
But described n twisted-pair feeder channel is not connected to CO has been connected to CPE, described in a kind of in crosstalking of the near-end common mode crosstalk, the near-end differential mode that comprise cpe end that crosstalk.
10. method as described in claim 8 or 9, is characterized in that, forms two channels of this channel combination in described different channels combination,
Be all two twisted-pair feeder channels, described two twisted-pair feeder channels can generate a non-cascade extended channel; Or,
Be all a twisted-pair feeder channel and a non-cascade extended channel, a described twisted-pair feeder channel and a non-cascade extended channel can generate 1 grade of cascade extended channel; Or,
All two non-cascade extended channels; Described two non-cascade extended channels can generate 1 grade of cascade extended channel; Or,
All two L-1 level cascade extended channels; Described two L-1 level cascade extended channels can generate L level cascade extended channel, wherein a L>1; Or,
All a L-1 level cascade extended channel and a twisted-pair feeder channel; A described L-1 level cascade extended channel and a twisted-pair feeder channel can generate L level cascade extended channel, wherein a L>1; Or,
All a L-1 level cascade extended channel and a non-cascade extended channel; A described L-1 level cascade extended channel and a non-cascade extended channel can generate L level cascade extended channel, wherein a L>1; Or,
All a L-1 level cascade extended channel and a L-i level cascade extended channel; A described L-1 level cascade extended channel and a L-i level cascade extended channel can generate a L level cascade extended channel, L>1 wherein, i>1.
11. 1 kinds of extended channel devices, is characterized in that, comprising:
Extended channel generation unit, for using n twisted-pair feeder channel, adopts respectively different channels assembled scheme to generate a different m extended channel, each scheme in described different channels assembled scheme generates m extended channel, wherein, n>2, m≤n-1, wherein, extended channel is divided into non-cascade extended channel and cascade extended channel, each non-cascade extended channel is generated by two twisted-pair feeder channels, each 1 grade of cascade extended channel is generated by two non-cascade extended channels, or, by a non-cascade extended channel and a twisted-pair feeder channel, generated, each L level cascade extended channel, L>1 wherein, by two L-1 level cascade extended channels, generated, or, by a L-1 level cascade extended channel and a non-cascade extended channel, generated, or, by a L-1 level cascade extended channel and a twisted-pair feeder channel, generated, or, by a L-1 level cascade extended channel and a L-i level cascade extended channel, generated, i>1 wherein,
Performance parameter obtains unit, for obtaining respectively the Performance Parameters value of m the extended channel generating under described different channels assembled scheme;
Selected cell, for the Performance Parameters value of m extended channel generating under more described different channels assembled scheme, and select channel assembled scheme corresponding to a non-minimum value P in the Performance Parameters of m extended channel under described different channels assembled scheme.
12. devices as claimed in claim 11, is characterized in that, described performance parameter obtains unit and comprises:
Measurement module, for measuring respectively the performance parameter value of m each extended channel of extended channel generating under described different channels assembled scheme, described performance parameter value comprises a kind of in the inverse of longitudinal balance degree, activation rate, achievable rate, signal to noise ratio, decay, wherein m >=1; Or, for measuring respectively overall crossfire value or overall crosstalk energy value, the wherein m>1 between m the extended channel generating under described different channels assembled scheme;
Computing module, the performance parameter value sum of m each extended channel of extended channel generating under the described different channels assembled scheme for computation and measurement gained, described and as described Performance Parameters value, wherein m >=1; Or, for the inverse of the overall crossfire value between m the extended channel generating under the described different channels assembled scheme of computation and measurement gained or the inverse of overall crosstalk energy value, the inverse of the reciprocal or overall crosstalk energy value of described overall crossfire value is as Performance Parameters, wherein m>1.
13. devices as described in claim 11 or 12, is characterized in that, described extended channel generation unit comprises:
Modular converter for obtaining the common-mode signal of described n each twisted-pair feeder channel of twisted-pair feeder channel, carries out digital processing to generate m extended channel to described common-mode signal respectively under described different channels assembled scheme;
Control module, for controlling described modular converter carries out digital processing mode to described common-mode signal to obtain respectively described different channels assembled scheme.
14. devices as claimed in claim 13, is characterized in that, described extended channel generation unit further comprises:
Receiver module, for receive channel extend information, under described different channels assembled scheme, utilize respectively described channel expansion information to carry out digital processing to generate m extended channel to described common-mode signal, described channel expansion information comprise twisted-pair cable that user uses to quantity, whether generate cascade extended channel.
15. devices as described in claim 11 or 12, is characterized in that, described extended channel generation unit comprises:
Control module and one group of electronic switch, described control module is controlled described one group of electronic switch and is adopted respectively different Switch State Combination in Power Systems to generate described different channels assembled scheme, described different Switch State Combination in Power Systems is corresponding one by one with described different channels assembled scheme, according to each Switch State Combination in Power Systems, control the state of each switch in described one group of electronic switch to generate m extended channel.
The device of 16. 1 kinds of extended channels, is characterized in that, comprising:
Twisted-pair feeder channel selected cell, for select at random respectively n twisted-pair feeder channel of various combination from N twisted-pair feeder channel, n>2 wherein, N>n, wherein, extended channel is divided into non-cascade extended channel and cascade extended channel, each non-cascade extended channel is generated by two twisted-pair feeder channels, each 1 grade of cascade extended channel is generated by two non-cascade extended channels, or, by a non-cascade extended channel and a twisted-pair feeder channel, generated, each L level cascade extended channel, L>1 wherein, by two L-1 level cascade extended channels, generated, or, by a L-1 level cascade extended channel and a non-cascade extended channel, generated, or, by a L-1 level cascade extended channel and a twisted-pair feeder channel, generated, or, by a L-1 level cascade extended channel and a L-i level cascade extended channel, generated, i>1 wherein,
Intermediate channels assembled scheme selected cell, be used for using n twisted-pair feeder channel, adopt respectively different channels assembled scheme to generate a different m extended channel, each scheme in described different channels assembled scheme generates m extended channel, wherein, n>2, m≤n-1, m extended channel comprises at least one extended channel; Obtain respectively the Performance Parameters value of m the extended channel generating under described different channels assembled scheme; The Performance Parameters value of m the extended channel generating under more described different channels assembled scheme, and select the channel assembled scheme that one of them non-minimum value P is corresponding;
Final scheme selected cell, for non-minimum value P corresponding to n twisted-pair feeder channel of more described various combination and select the channel assembled scheme corresponding to non-minimum value of Performance Parameters of m extended channel under described different channels assembled scheme.
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- 2011-07-05 WO PCT/CN2011/076849 patent/WO2012106865A1/en active Application Filing
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| US5485488A (en) * | 1994-03-29 | 1996-01-16 | Apple Computer, Inc. | Circuit and method for twisted pair current source driver |
| CN1350392A (en) * | 2000-10-11 | 2002-05-22 | 日本电气株式会社 | Method for measuring and improving data subscriber transmitting characteristics |
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| CN1805305A (en) * | 2005-01-13 | 2006-07-19 | 松下电器产业株式会社 | Adaptive space-time transmit diversity method and apparatus by means of antenna selection |
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| Publication number | Publication date |
|---|---|
| CN102308486A (en) | 2012-01-04 |
| WO2012106865A1 (en) | 2012-08-16 |
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