WO2002023739A3 - Method and apparatus for decoding of turbo encoded data - Google Patents

Method and apparatus for decoding of turbo encoded data Download PDF

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Publication number
WO2002023739A3
WO2002023739A3 PCT/US2001/028974 US0128974W WO0223739A3 WO 2002023739 A3 WO2002023739 A3 WO 2002023739A3 US 0128974 W US0128974 W US 0128974W WO 0223739 A3 WO0223739 A3 WO 0223739A3
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Prior art keywords
values
alpha
calculations
logarithmic
decoding
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PCT/US2001/028974
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French (fr)
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WO2002023739A2 (en
Inventor
Hau Thien Tran
Kelly B Cameron
Ba-Zhong Shen
Christopher R Jones
Thomas A Hughes Jr
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Broadcom Corp
Hau Thien Tran
Kelly B Cameron
Ba-Zhong Shen
Christopher R Jones
Thomas A Hughes Jr
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Application filed by Broadcom Corp, Hau Thien Tran, Kelly B Cameron, Ba-Zhong Shen, Christopher R Jones, Thomas A Hughes Jr filed Critical Broadcom Corp
Priority to AU2001292700A priority Critical patent/AU2001292700A1/en
Priority to EP01973082A priority patent/EP1364463A2/en
Publication of WO2002023739A2 publication Critical patent/WO2002023739A2/en
Publication of WO2002023739A3 publication Critical patent/WO2002023739A3/en

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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M13/00—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes
    • H03M13/37—Decoding methods or techniques, not specific to the particular type of coding provided for in groups H03M13/03 - H03M13/35
    • H03M13/39—Sequence estimation, i.e. using statistical methods for the reconstruction of the original codes
    • H03M13/3972—Sequence estimation, i.e. using statistical methods for the reconstruction of the original codes using sliding window techniques or parallel windows
    • H—ELECTRICITY
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    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M13/00—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes
    • H03M13/03—Error detection or forward error correction by redundancy in data representation, i.e. code words containing more digits than the source words
    • H03M13/05—Error detection or forward error correction by redundancy in data representation, i.e. code words containing more digits than the source words using block codes, i.e. a predetermined number of check bits joined to a predetermined number of information bits
    • H03M13/13—Linear codes
    • H03M13/15—Cyclic codes, i.e. cyclic shifts of codewords produce other codewords, e.g. codes defined by a generator polynomial, Bose-Chaudhuri-Hocquenghem [BCH] codes
    • H03M13/151—Cyclic codes, i.e. cyclic shifts of codewords produce other codewords, e.g. codes defined by a generator polynomial, Bose-Chaudhuri-Hocquenghem [BCH] codes using error location or error correction polynomials
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    • H03M13/00—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes
    • H03M13/25—Error detection or forward error correction by signal space coding, i.e. adding redundancy in the signal constellation, e.g. Trellis Coded Modulation [TCM]
    • H—ELECTRICITY
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    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M13/00—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes
    • H03M13/25—Error detection or forward error correction by signal space coding, i.e. adding redundancy in the signal constellation, e.g. Trellis Coded Modulation [TCM]
    • H03M13/258—Error detection or forward error correction by signal space coding, i.e. adding redundancy in the signal constellation, e.g. Trellis Coded Modulation [TCM] with turbo codes, e.g. Turbo Trellis Coded Modulation [TTCM]
    • H—ELECTRICITY
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    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M13/00—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes
    • H03M13/27—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes using interleaving techniques
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    • H03M13/2957—Turbo codes and decoding
    • H03M13/2978—Particular arrangement of the component decoders
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    • H03M13/39—Sequence estimation, i.e. using statistical methods for the reconstruction of the original codes
    • H03M13/3905—Maximum a posteriori probability [MAP] decoding or approximations thereof based on trellis or lattice decoding, e.g. forward-backward algorithm, log-MAP decoding, max-log-MAP decoding
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    • H03M13/3905—Maximum a posteriori probability [MAP] decoding or approximations thereof based on trellis or lattice decoding, e.g. forward-backward algorithm, log-MAP decoding, max-log-MAP decoding
    • H03M13/3922—Add-Compare-Select [ACS] operation in forward or backward recursions
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    • H03M13/37—Decoding methods or techniques, not specific to the particular type of coding provided for in groups H03M13/03 - H03M13/35
    • H03M13/39—Sequence estimation, i.e. using statistical methods for the reconstruction of the original codes
    • H03M13/3905—Maximum a posteriori probability [MAP] decoding or approximations thereof based on trellis or lattice decoding, e.g. forward-backward algorithm, log-MAP decoding, max-log-MAP decoding
    • H03M13/3927—Log-Likelihood Ratio [LLR] computation by combination of forward and backward metrics into LLRs
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    • H03M13/00—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes
    • H03M13/37—Decoding methods or techniques, not specific to the particular type of coding provided for in groups H03M13/03 - H03M13/35
    • H03M13/39—Sequence estimation, i.e. using statistical methods for the reconstruction of the original codes
    • H03M13/3988—Sequence estimation, i.e. using statistical methods for the reconstruction of the original codes for rate k/n convolutional codes, with k>1, obtained by convolutional encoders with k inputs and n outputs
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    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M13/00—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes
    • H03M13/37—Decoding methods or techniques, not specific to the particular type of coding provided for in groups H03M13/03 - H03M13/35
    • H03M13/39—Sequence estimation, i.e. using statistical methods for the reconstruction of the original codes
    • H03M13/41—Sequence estimation, i.e. using statistical methods for the reconstruction of the original codes using the Viterbi algorithm or Viterbi processors
    • H03M13/4107—Sequence estimation, i.e. using statistical methods for the reconstruction of the original codes using the Viterbi algorithm or Viterbi processors implementing add, compare, select [ACS] operations
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    • H03M13/65—Purpose and implementation aspects
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    • H03M13/65—Purpose and implementation aspects
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    • H04L1/00—Arrangements for detecting or preventing errors in the information received
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    • H04L1/0041—Arrangements at the transmitter end
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    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
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    • H04L1/0047—Decoding adapted to other signal detection operation
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    • H03M13/03—Error detection or forward error correction by redundancy in data representation, i.e. code words containing more digits than the source words
    • H03M13/05—Error detection or forward error correction by redundancy in data representation, i.e. code words containing more digits than the source words using block codes, i.e. a predetermined number of check bits joined to a predetermined number of information bits
    • H03M13/13—Linear codes
    • H03M13/15—Cyclic codes, i.e. cyclic shifts of codewords produce other codewords, e.g. codes defined by a generator polynomial, Bose-Chaudhuri-Hocquenghem [BCH] codes
    • H03M13/151—Cyclic codes, i.e. cyclic shifts of codewords produce other codewords, e.g. codes defined by a generator polynomial, Bose-Chaudhuri-Hocquenghem [BCH] codes using error location or error correction polynomials
    • H03M13/1515—Reed-Solomon codes
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    • H04L1/0059—Convolutional codes
    • H04L1/006—Trellis-coded modulation

Abstract

propabad and apparatus for reducing memory requirements and increasing speed of decoding of turbo encoded data in a MAP decoder. Turbo coded data is decoded by computing alpha values and saving checkpoint alpha values on a stack. The checkpoint values are then used to recreate the alpha values to be used in computations when needed. By saving only a subset of the Alpha values memory to hold them is conserved. Alpha and beta computations are made using a min* operation which provides a mathematic equivalence for adding logarithmic values without having to convert from the logarithmic domain. To increase the speed of the min* operation logarithmic values are computed assuming that one min* input is larger than the other and visa versa at the same time. The correct value is selected later based on a partial resulta calculation comparing the values accepted for the min* calculation. Additionally calculations are begun without waiting for previous calculations to finish. The computational values are kept to a minimal accuracy to minimize propagation delay. An offset is added to the logarithmic calculations in order to keep the calculations from becoming negative and requiring another bit to represent a sign bit. Circuits that correct for errors in partial results are employed. Normalization circuits which zero alpha and beta most significant bits based on a previous decoder interation are employed to add only minimal time to circuit critical paths.
PCT/US2001/028974 2000-09-12 2001-09-12 Method and apparatus for decoding of turbo encoded data WO2002023739A2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AU2001292700A AU2001292700A1 (en) 2000-09-12 2001-09-12 Method and apparatus for decoding of turbo encoded data
EP01973082A EP1364463A2 (en) 2000-09-12 2001-09-12 Method and apparatus for decoding of turbo encoded data

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
US23205300P 2000-09-12 2000-09-12
US23228800P 2000-09-12 2000-09-12
US60/232,288 2000-09-12
US60/232,053 2000-09-12
US09/878,148 US7242726B2 (en) 2000-09-12 2001-06-08 Parallel concatenated code with soft-in soft-out interactive turbo decoder
US09/878,148 2001-06-08

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WO2002023739A2 WO2002023739A2 (en) 2002-03-21
WO2002023739A3 true WO2002023739A3 (en) 2003-09-25

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PCT/US2001/028875 WO2002023738A2 (en) 2000-09-12 2001-09-12 Parallel concatenated code with soft-in soft-out interactive turbo decoder
PCT/US2001/028974 WO2002023739A2 (en) 2000-09-12 2001-09-12 Method and apparatus for decoding of turbo encoded data

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EP (2) EP1327307B1 (en)
AU (2) AU2001294564A1 (en)
WO (2) WO2002023738A2 (en)

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