WO2002041494A3 - Method and apparatus for implementing a parallel correlator and applications thereof - Google Patents

Method and apparatus for implementing a parallel correlator and applications thereof Download PDF

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Publication number
WO2002041494A3
WO2002041494A3 PCT/US2001/043077 US0143077W WO0241494A3 WO 2002041494 A3 WO2002041494 A3 WO 2002041494A3 US 0143077 W US0143077 W US 0143077W WO 0241494 A3 WO0241494 A3 WO 0241494A3
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WO
WIPO (PCT)
Prior art keywords
results
layer
coefficient
bits
coefficients
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Application number
PCT/US2001/043077
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French (fr)
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WO2002041494A2 (en
Inventor
David F Sorrells
Michael J Bultman
Gregory S Rawlins
Michael W Rawlins
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Parkervision Inc
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Priority to AU2002239251A priority Critical patent/AU2002239251A1/en
Publication of WO2002041494A2 publication Critical patent/WO2002041494A2/en
Publication of WO2002041494A3 publication Critical patent/WO2002041494A3/en

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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions
    • G06F17/10—Complex mathematical operations
    • G06F17/15—Correlation function computation including computation of convolution operations
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions
    • G06F17/10—Complex mathematical operations
    • G06F17/14—Fourier, Walsh or analogous domain transformations, e.g. Laplace, Hilbert, Karhunen-Loeve, transforms
    • G06F17/141—Discrete Fourier transforms
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions
    • G06F17/10—Complex mathematical operations
    • G06F17/14—Fourier, Walsh or analogous domain transformations, e.g. Laplace, Hilbert, Karhunen-Loeve, transforms
    • G06F17/147—Discrete orthonormal transforms, e.g. discrete cosine transform, discrete sine transform, and variations therefrom, e.g. modified discrete cosine transform, integer transforms approximating the discrete cosine transform

Abstract

A fast correlator transform (FCT) algorithm and methods and systems for implementing same, correlate an encoded data word (X0-XM-1) with encoding coefficients (C0-CM-1), wherein each of (X0-XM-1) is represented by one or more bits and each said coefficient is represented by one or more bits, wherein each coefficient has k possible states, and wherein M is greater than 1. In accordance with the invention, X0 is multiplied by each state (C0(0) through C0(k-1)) of the coefficient C0, thereby generating results X0C0(0) through X0C0(k-1). This is repeating for data bits (X1-XM-1)and corresponding coefficients (C1-CM-1), respectively. The results are grouped into N groups. Members of each of the N groups are added to one another, thereby generating a first layer of correlation results. The first layer of results is grouped and the members of each group are summed with one another to generate a second laber of results. This process is repeated as necessary until a final layer of results is generated. The final layer of results includes a separate correlation output for each possible state of the complete set of coefficients (C0-CM-1). The final layers of results is compared to identify a most likely code encoded on said data word.
PCT/US2001/043077 2000-11-14 2001-11-14 Method and apparatus for implementing a parallel correlator and applications thereof WO2002041494A2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2002239251A AU2002239251A1 (en) 2000-11-14 2001-11-14 Method and apparatus for implementing a parallel correlator and applications thereof

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US24800100P 2000-11-14 2000-11-14
US60/248,001 2000-11-14

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WO2002041494A2 WO2002041494A2 (en) 2002-05-23
WO2002041494A3 true WO2002041494A3 (en) 2003-08-21

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US (3) US7010559B2 (en)
AU (1) AU2002239251A1 (en)
WO (1) WO2002041494A2 (en)

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US20050193049A1 (en) 2005-09-01
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