CN101188585B - Conversion method of data sampling rate and its system in baseband signal transmission - Google Patents
Conversion method of data sampling rate and its system in baseband signal transmission Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0262—Arrangements for detecting the data rate of an incoming signal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/05—Electric or magnetic storage of signals before transmitting or retransmitting for changing the transmission rate
Abstract
The invention provides a data sampling rate conversion method in baseband signal transmission and a transmission system thereof. The method comprises the following steps: firstly, a radio frequency far end unit receives antenna data, and a data sampling rate conversion module performs sampling reducing processing to the data in the baseband signal; secondly, the processed data is continued to be transmitted through a data transmission channel; thirdly, before the data is transmitted to a baseband chip, a data sampling rate restoring module processes the data, restores the sampling rate to the sampling rate required for the baseband chip, and then performs post processing. The baseband signal sampling rate conversion method of the invention can greatly increase the RRU connection number under the premise that the performance is not influenced.
Description
Technical field
The present invention relates to digital communication system, the transform method and the system thereof of data sampling rate during baseband signal is transmitted in particularly a kind of digital communication system.
Background technology
In the wireless communication system, owing to be subjected to the restriction of Optical Fiber Transmission ability, (RF Rmote Unit, RRU) number is limited to the supported RF remote unit in base station (NodeB) at present.In order to make communication products more competitive (for operator saves cost), need in limited transmittability, connect more RRU.
(RF Rmote Unit RRU) is applied in the present radio frequency remote technology RF remote unit, realizes the transmitting-receiving of radio-frequency head, by Optical Fiber Transmission and NodeB baseband interface.
Shown in Figure 1 is NodeB and RF remote unit RRU connection diagram in the prior art.RF remote unit RRU mainly is the transmitting-receiving that realizes radio-frequency head, by Optical Fiber Transmission and NodeB baseband interface.Be that a plurality of RRU are unit cascaded by Optical Fiber Transmission and baseband interface shown in the figure, the antenna number that connects the RRU unit can be single antenna, double antenna or many antennas.
Under the prior art, if use the Optical Fiber Transmission of 1.2288G or 2.4576G respectively, if the uplink and downlink base band uses existing 8 bits and 16 bit bit wides to handle, and adopts the 3.84*2M/s sampling rate, then only can support 3 RRU (1.2288G) or 7 RRU (2.4576G).
In order to make NodeB can support more RRU unit, can in I, Q data transmission procedure, take to reduce the method for quantization bit and transformed samples rate.If bit width position, the single sub-district of RBI is handled and is not changed the sampling rate size, uplink and downlink base band bit bit wide is dropped to 7 bits and 15 bits respectively, then can support 4 RRU (1.2288G) or 8 RRU (2.4576G).Assess by the difference that simulation means is handled the base band receptivity of front and back to cut position, it is very little to performance impact to find to reduce quantization bit, for system, can accept fully, if but reduce quantization bit once more will be bigger to receiving Effect on Performance.
Therefore consider transform data sample rate in the baseband signal transmission course, reach the purpose that increases the RRU unit number.If take the method for transformed samples rate, just need carry out down-sampled processing to data speed.Present antenna base band data sampling rate is 3.84*2M/s, and actual carrier frequency separation is 5MHz, and effective signal bandwidth is distributed in about 0 frequency less than 5MHz, and peak frequency is 2.5MHz.According to sampling thheorem, promptly can obtain primary signal without distortion as long as satisfy the sampling rate of 3.84/2*1.22=2.34M/s (roll-off factor is 1.22), reduce sample rate and also just reduced volume of transmitted data, can in limited transmittability, transmit the data of more antennas or RRU.Then the data of low sampling rate are returned to 3.84*2M/s by simple FIR filtering interpolation method with sampling rate.Adopt this method, almost not having in guaranteed performance only increases FIR filtering interpolation processing process under the prerequisite of loss, and the concatenation ability between RRU and the NodeB just can obtain 30%～60% raising.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of data transmission method of transform data sample rate, makes that NodeB can support more RF remote unit (RRU) in limited transmittability, solves the defective of off-capacity in the present system.
The present invention proposes the method for data sampling rate conversion in a kind of baseband signal transmission, comprises following steps:
(a) in RF remote unit RRU, utilize FIR filtering difference approach that the data in the baseband signal are carried out down-sampled processing;
(b) data after the processing continue to be transferred to base station node B;
(c) in transfer of data to baseband chip, in NodeB, utilize FIR filtering difference approach that data are handled, its sample rate is returned to the sample rate of baseband chip requirement.
Data sampling rate in the described step (a) after down-sampled is greater than 2.34M/s.
Described FIR filtering interpolation method comprises following steps:
(d1) pending data are made L times of interpolation;
(d2) data after the interpolation are extracted, extract one in every M the value, wherein, L, the value of M makes that its sample rate of data after extracting is desired sample rate;
(d3) with data processed and N rank FIR filter factor integration in (d2), generate new sequence, the parameter of determining when wherein filter length N and FIR filter factor are for system design.
A kind of baseband signal transmission system comprises RF remote unit RRU, data transmission channel and base station node B, it is characterized in that: also comprise the A/D modular converter among the described RF remote unit RRU, the data sampling rate conversion module also comprises data sampling rate and recovers module among the described NodeB, wherein:
The antenna data that described A/D modular converter is used for that RRU is received carries out the A/D conversion;
Described data sampling rate conversion module is used to utilize FIR filtering difference approach that the data of A/D modular converter output are carried out down-sampled processing;
Described data sampling rate recovers module and is used for utilizing the data that FIR filtering difference approach transmits data transmission channel to carry out sample rate recovery processing, data sampling rate is returned to the sample rate of baseband chip requirement.
Described RF remote unit reception antenna data, change by the A/D modular converter, by described data sampling rate conversion module the data after changing are carried out down-sampled processing then, data processed transfers to NodeB by data transmission channel, recovers the sample rate that module returns to data sampling rate the baseband chip requirement by described data sampling rate again.
Baseband signal sampling rate conversion method of the present invention, compared with prior art, a kind of special treatment method that reduces sampling rate and carry out the sampling rate recovery after transmission has been done in transmission to antenna data, by simulating, verifying method of the present invention receptivity is not almost influenced, and under the impregnable prerequisite of performance, can increase the RRU linking number.Sampling rate after the reduction of adopting in the emulation is 2.4*2M/s, and the concatenation ability between RRU and the NodeB has improved about 50%.
Description of drawings
Fig. 1 is NodeB and a RRU unit connection diagram in the prior art;
Fig. 2 is a baseband signal transmission system structured flowchart of the present invention;
Fig. 3 is a data sampling rate conversion scheme general flow chart of the present invention;
Fig. 4 is that the down-sampled and sampling rate in the baseband signal transmission of the present invention is recovered concrete implementing procedure figure;
Fig. 5 is the signal schematic representation before and after sampling rate conversion of the present invention is handled;
Wherein Fig. 5 (a) is the signal schematic representation without the over-sampling rate conversion;
The signal schematic representation of Fig. 5 (b) for recovering through down-sampled and sample rate to handle;
Fig. 5 (c) is untreated signal and the middle processed signal contrast of Fig. 5 (b) schematic diagram among Fig. 5 (a).
Embodiment
The present invention is described in further detail below in conjunction with the drawings and specific embodiments.
Data sampling rate transform method in the baseband transmission of the present invention, be that a kind of reduction I, Q data are (according to the modulation system QPSK modulation of adopting, need input two-way modulation signal, one the tunnel is I circuit-switched data, one the tunnel is the Q circuit-switched data) thus the sampling rate in the transmission course increases the method for RRU unit linking number, and the basic scheme of its technology is:
At system design stage, determine FIR filter factor and FIR filter length.The FIR filter factor here will be applied to the FIR filter of following two diverse locations: required FIR filter factor when data are down-sampled in (1) RRU unit; (2) FIR filtering interpolation is carried out sampling rate required filter factor when recovering.
In system's operation phase, each following step of main branch of handling is carried out:
The first step: down-sampled process, in the RRU unit, drop to fs ' sampling rate and carry out transfer of data from original 3.84*2M/s sampling rate, according to sampling thheorem, as long as satisfy and promptly can obtain primary signal without distortion greater than the sampling rate of 3.84/2*1.22=2.34M/s (roll-off factor is 1.22), the desirable 2.4*2 of the fs ' here, 2.64*2 or the 2.88*2M equivalence, carry out next step then;
Down-sampled specific implementation method has two kinds:
1. directly use low sampling rate, be made as fs ' (the desirable 2.4*2 of fs ', 2.64*2 or 2.88*2M equivalence) here and sample;
2. keep existing sampling rate 3.84*2M/s, before the transmission data, carry out down-sampledly, sampling rate is dropped to fs ' from 3.84*2M/s with FIR filtering interpolation method.
For the filtering interpolation convenient, the sampling rate of choosing can for:
(1) 3.84*2*5/8=4.8M/s, the antenna data stream of transmission is original 1.6 times, the RRU number increases about 50%;
(2) 3.84*2*11/16=5.28M/s, the antenna data stream of transmission is original 1.45 times, the RRU number increases about 49%;
(3) 3.84*2*3/4=5.76M/s, the antenna data stream of transmission is original 1.33 times, the RRU number increases about 40%.
Here getting these three kinds of values is example, can certainly choose other sampling rate.
Second step: transfer of data is to NodeB;
The 3rd step: sampling rate is recovered, and carries out transfer of data through data transmission channel under fs ' sampling rate, adopts FIR filtering interpolation to recover sampling rate to 3.84*2M/s in NodeB;
The 4th step: adopt former sampling rate 3.84*2M/s to transmit data to baseband chip, finish subsequent treatment.
Shown in Figure 2 is baseband signal transmission system structured flowchart of the present invention.This system comprises RF remote unit RRU, and data transmission channel and base station node B comprise A/D modular converter and data sampling rate conversion module in the RF remote unit, and comprise data sampling rate among the NodeB and recover module, wherein:
The antenna data that described A/D modular converter is used for that RRU is received carries out the A/D conversion;
Described data sampling rate conversion module is used for the data of A/D modular converter output are carried out down-sampled processing;
The data that described data sampling rate recovery module is used for that data transmission channel is transmitted are carried out sample rate and are recovered processing, data sampling rate are returned to the sample rate of baseband chip requirement.
The antenna data that RF remote unit RRU receives carries out the A/D conversion, carries out the conversion of data sampling rate then, reduces sampling rate and carries out transfer of data, and the down-sampled method here has two kinds:
1) directly samples with low sampling rate fs ';
2) reduce sampling rate to fs ' by FIR filtering interpolation.Here interpolation, sampling and filtering are combined unified consideration, to realize that the multiplication number of times is minimum filter construction.
Adopt second method among the present invention, because present antenna data sampling rate is 3.84*2M/s, the antenna data that the RRU unit is received by method two is reduced to fs ' from the sampling rate of 3.84*2M/s through FIR filtering interpolation, transmits data to NodeB through data transmission channel.Because under prior art, uplink baseband I, Q data sampling speed are fixed as 3.84*2M/s, are the data that the data of fs ' return to the 2 sampling speed of 3.84M by FIR filtering interpolation with sampling rate in NodeB therefore.
Shown in Figure 3 is data sampling rate conversion scheme general flow chart, and this scheme mainly comprises two processes: down-sampled process and data sampling rate recovery process.
Figure 4 shows that the down-sampled process in the baseband signal transmission and the flow chart of sampling rate recovery process.The concrete data sampling rate transform process method of carrying out of this flow chart can be divided into following step:
1. RF remote unit RRU reception antenna I, Q data are carried out the A/D conversion;
2. down-sampled process;
Realize down-sampledly in the RRU unit, the present invention adopts above-mentioned second method, keeps existing sampling rate 3.84*2M/s, carries out down-sampledly before the transmission data with FIR filtering interpolation method, and step is achieved as follows:
The first step: the sampling rate of 3.84*2M/s doubly is interpolated into 3.84*2*L (M/s) through L1;
Second step: the data that interpolation is later extract, and the value from every M1 sampled point is got a sampled point as extracting the value of first sampled point in the M1 sampled point, promptly obtains the data flow of fs '=3.84*2*L1/M1 (M/s);
The 3rd step: the data flow that interpolation sampling is later and the FIR filter factor on N rank carry out integration (FIR filter factor here and FIR filter length N are the parameters of determining) respectively when system design, generate new sequence, adopt low sampling rate fs ', RF remote unit RRU transmits data to deliver in the base band and is for further processing.
Wherein, L1 is the interpolation multiple, and M1 is an extracting multiple, and N is a filter length, and fs ' is the low sampling rate after the data sampling rate conversion.
Suppose that input signal is x (n), output signal is y (n), and h (n) is FIR filter response (being the impulse response of FIR filter factor), then output signal
FIR filter unit sample respo wherein
g(n，m)＝h(nL1+<mM1>
L1)n＝0，1，...，K-1，m＝0，1，...，L1-1，K＝N/L1
As can be seen from the above equation, the input data x (n) according to
Conversion, to each outputting data signals y (n), n=0,1 ..., L1-1, at each n constantly, the y (n) that input data and filter coefficient correspondence multiply each other and obtain this moment is then with the multiplication of next filter, obtain down a bit exporting y (n), finish up to total data processing to input data x (n).
3. carry out transfer of data to NodeB;
4.FIR the filtering interpolation is recovered sampling rate;
Based on the demand of baseband chip, its sampling rate requires to be 3.84*2M/s, therefore for the down-sampled antenna data of RRU unit output, need carry out the recovery of sampling rate and handle, and sampling rate is returned to 3.84*2M/s from fs '.This just needs to adopt FIR filtering interpolation to realize that its processing procedure is as follows:
The first step: the low sampling rate of fs ' doubly is interpolated into fs ' * L2 (M/s) through L2;
Second step: the data that interpolation is later extract, and the value of getting a sampled point from every M2 sampled point as extracting first sampled point in M2 the sampled point, promptly obtains the data flow of fs=fs ' * L2/M2=3.84*2M/s.
The 3rd step: the data flow that interpolation sampling is later and the FIR filter factor on N rank carry out integration (FIR filter factor here and FIR filter length N are the parameters of determining) respectively when system design, generate new sequence.Adopt former sampling rate 3.84*2M/s to transmit data to baseband chip this moment, finishes subsequent treatment.
Wherein, wherein, L2 is the interpolation multiple, and M2 is an extracting multiple, and N is a filter length, and fs is a primary antenna data sampling speed.
Suppose that input signal is x (n), output signal is y (n), and h (n) is FIR filter response (being the impulse response of FIR filter factor), then output signal
Wherein FIR filter unit sampling is corresponding
g(n，m)＝h(nL2+<mM2>
L2)＝n0，1，...，K-1，m＝0，1，...，L1-1，K＝N/L2
As can be seen from the above equation, the input data x (n) according to
Conversion, to each outputting data signals y (n), n=0,1 ..., L2-1, at each n constantly, the y (n) that input data and filter coefficient correspondence multiply each other and obtain this moment is then with the multiplication of next filter, obtain down a bit exporting y (n), finish up to total data processing to input data x (n).
5. transfer of data is carried out subsequent treatment to baseband chip.
Shown in Figure 5 is the signal schematic representation of sampling rate conversion processing method front and back, and wherein: a) signal schematic representation of data sampling rate conversion process of the present invention is not passed through in expression; B) expression is through the data sampling rate conversion, and the down-sampled sampling rate of Cai Yonging is 2.4*2M/s here, at first is the down-sampled processing of FIR filtering interpolation, is the later signal schematic representation of processing of FIR filtering interpolation sampling rate recovery then; C) for being placed among the figure, the signal among above-mentioned two figure compares.
Because present antenna base band data sampling rate is 3.84*2M/s, and actual carrier frequency separation is 5MHz, effective signal bandwidth is distributed in about 0 frequency less than 5MHz, and peak frequency is 2.5MHz.According to sampling thheorem, promptly can obtain primary signal without distortion as long as satisfy the sampling rate of 3.84/2*1.22=2.34M/s (roll-off factor is 1.22), figure c from Fig. 5) as can be seen, both signals are basic identical, difference is very little, so the present invention only increases FIR filtering interpolation processing process to almost not influence of performance.
Claims (4)
1. the method for data sampling rate conversion during a baseband signal is transmitted comprises following steps:
(a) in RF remote unit RRU, utilize FIR filtering difference approach that the data in the baseband signal are carried out down-sampled processing;
Wherein, described FIR filtering interpolation method comprises following steps:
(d1) pending data are made L times of interpolation;
(d2) data after the interpolation are extracted, extract one in every M the value, wherein, L, the value of M makes that its sample rate of data after extracting is desired sample rate;
(d3) with data processed and N rank FIR filter factor integration in (d2), generate new sequence, the parameter of determining when wherein filter length N and FIR filter factor are for system design;
(b) data after the processing continue to be transferred to base station node B;
(c) in transfer of data to baseband chip, in NodeB, utilize FIR filtering difference approach that data are handled, its sample rate is returned to the sample rate of baseband chip requirement.
2. the method for claim 1 is characterized in that: the data sampling rate in the described step (a) after down-sampled is greater than 2.34M/s.
3. a baseband signal transmission system comprises RF remote unit RRU, data transmission channel and base station node B, it is characterized in that: also comprise the A/D modular converter among the described RF remote unit RRU, the data sampling rate conversion module also comprises data sampling rate and recovers module among the described NodeB, wherein:
The antenna data that described A/D modular converter is used for that RRU is received carries out the A/D conversion;
Described data sampling rate conversion module is used to utilize FIR filtering difference approach that the data of A/D modular converter output are carried out down-sampled processing; Wherein, described FIR filtering interpolation method comprises:
(d1) pending data are made L times of interpolation;
(d2) data after the interpolation are extracted, extract one in every M the value, wherein, L, the value of M makes that its sample rate of data after extracting is desired sample rate;
(d3) with data processed and N rank FIR filter factor integration in (d2), generate new sequence, the parameter of determining when wherein filter length N and FIR filter factor are for system design;
Described data sampling rate recovers module and is used for utilizing the data that FIR filtering difference approach transmits data transmission channel to carry out sample rate recovery processing, data sampling rate is returned to the sample rate of baseband chip requirement.
4. system as claimed in claim 3, it is characterized in that: described RF remote unit reception antenna data, change by the A/D modular converter, by described data sampling rate conversion module the data after changing are carried out down-sampled processing then, data processed transfers to NodeB by data transmission channel, recovers the sample rate that module returns to data sampling rate the baseband chip requirement by described data sampling rate again.
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| CN2006101458154A CN101188585B (en) | 2006-11-17 | 2006-11-17 | Conversion method of data sampling rate and its system in baseband signal transmission |
| PCT/CN2007/000656 WO2008058439A1 (en) | 2006-11-17 | 2007-03-01 | A method and system for converting the data sample rate in the baseband signal transmission |
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| CN2006101458154A CN101188585B (en) | 2006-11-17 | 2006-11-17 | Conversion method of data sampling rate and its system in baseband signal transmission |
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| CN101753181B (en) * | 2008-12-12 | 2015-04-29 | 电信科学技术研究院 | Data transmission method, system and device |
| CN101754490B (en) * | 2008-12-17 | 2012-11-07 | 电信科学技术研究院 | Data transmission method, system and device |
| CN102215199A (en) * | 2010-04-09 | 2011-10-12 | 电信科学技术研究院 | In-phase/quadrature (IQ) data transmission method and device |
| CN103929388B (en) * | 2014-04-23 | 2017-10-03 | 大唐移动通信设备有限公司 | A kind of data handling system and processing method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4630285A (en) * | 1985-03-18 | 1986-12-16 | The United States Of America As Represented By The Director Of The National Security Agency | Method for reducing group delay distortion |
| JP2001196970A (en) * | 2000-01-11 | 2001-07-19 | Matsushita Electric Ind Co Ltd | Cdma receiver and cdma reception method |
| CN1464685A (en) * | 2002-06-13 | 2003-12-31 | 优创科技（深圳）有限公司 | Method for processing acoustic frequency flow playback in network terminal buffer |
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| US7693236B2 (en) * | 2000-05-15 | 2010-04-06 | Texas Instruments Incorporated | If-to-baseband conversion for flexible frequency planning capability |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4630285A (en) * | 1985-03-18 | 1986-12-16 | The United States Of America As Represented By The Director Of The National Security Agency | Method for reducing group delay distortion |
| JP2001196970A (en) * | 2000-01-11 | 2001-07-19 | Matsushita Electric Ind Co Ltd | Cdma receiver and cdma reception method |
| CN1464685A (en) * | 2002-06-13 | 2003-12-31 | 优创科技（深圳）有限公司 | Method for processing acoustic frequency flow playback in network terminal buffer |
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