WO2002023787A3 - Method and apparatus for soft information generation in joint demodulation of co-channel signals - Google Patents

Method and apparatus for soft information generation in joint demodulation of co-channel signals Download PDF

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Publication number
WO2002023787A3
WO2002023787A3 PCT/US2001/023922 US0123922W WO0223787A3 WO 2002023787 A3 WO2002023787 A3 WO 2002023787A3 US 0123922 W US0123922 W US 0123922W WO 0223787 A3 WO0223787 A3 WO 0223787A3
Authority
WO
WIPO (PCT)
Prior art keywords
nondetected
detected symbol
soft values
information generation
channel signals
Prior art date
Application number
PCT/US2001/023922
Other languages
French (fr)
Other versions
WO2002023787A2 (en
WO2002023787A9 (en
Original Assignee
Ericsson Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ericsson Inc filed Critical Ericsson Inc
Priority to AU2002211213A priority Critical patent/AU2002211213A1/en
Publication of WO2002023787A2 publication Critical patent/WO2002023787A2/en
Publication of WO2002023787A3 publication Critical patent/WO2002023787A3/en
Publication of WO2002023787A9 publication Critical patent/WO2002023787A9/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0045—Arrangements at the receiver end
    • H04L1/0054—Maximum-likelihood or sequential decoding, e.g. Viterbi, Fano, ZJ algorithms
    • 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
    • H03M13/3905—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
    • 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
    • H03M13/41—Sequence estimation, i.e. using statistical methods for the reconstruction of the original codes using the Viterbi algorithm or Viterbi processors
    • 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
    • H03M13/63—Joint error correction and other techniques
    • H03M13/6325—Error control coding in combination with demodulation

Landscapes

  • Physics & Mathematics (AREA)
  • Probability & Statistics with Applications (AREA)
  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Artificial Intelligence (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Error Detection And Correction (AREA)

Abstract

A method and apparatus generated soft values from a co-channel differentially encoded received signals. The soft values are generated by determining jointly detected symbols and corresponding joint metrics. A first potential nondetected metric sum is determined by flipping the current desired coherent detected symbol and keeping the interfered coherent detected symbol as is. A second potential nondetected metric sum is determined by flipping the previous desired coherent detected symbol and keeping the interfered coherent detected symbol as is. A minimum between the difference of the detected jont metrics and the two nondetected joint metrics is found. The soft values are then established based on the minimum difference metric.
PCT/US2001/023922 2000-09-12 2001-09-10 Method and apparatus for soft information generation in joint demodulation of co-channel signals WO2002023787A2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2002211213A AU2002211213A1 (en) 2000-09-12 2001-09-10 Method and apparatus for soft information generation in joint demodulation of co-channel signals

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US66005300A 2000-09-12 2000-09-12
US09/660,053 2000-09-12

Publications (3)

Publication Number Publication Date
WO2002023787A2 WO2002023787A2 (en) 2002-03-21
WO2002023787A3 true WO2002023787A3 (en) 2002-05-30
WO2002023787A9 WO2002023787A9 (en) 2003-08-28

Family

ID=24647932

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2001/023922 WO2002023787A2 (en) 2000-09-12 2001-09-10 Method and apparatus for soft information generation in joint demodulation of co-channel signals

Country Status (2)

Country Link
AU (1) AU2002211213A1 (en)
WO (1) WO2002023787A2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102263563A (en) * 2010-05-27 2011-11-30 中兴通讯股份有限公司 Decoding soft information processing method and device
US9036680B2 (en) 1999-09-10 2015-05-19 Interdigital Technology Corporation Interference cancellation in a spread spectrum communication system

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6115406A (en) 1999-09-10 2000-09-05 Interdigital Technology Corporation Transmission using an antenna array in a CDMA communication system

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0625829A2 (en) * 1993-05-21 1994-11-23 AT&T Corp. Post processing method and apparatus symbol reliability generation

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0625829A2 (en) * 1993-05-21 1994-11-23 AT&T Corp. Post processing method and apparatus symbol reliability generation

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
ARSLAN H ET AL: "Coherent MAP detection of DQPSK signals in non-ISI channels", WIRELESS COMMUNICATIONS AND NETWORKING CONFERENCE, 1999. WCNC. 1999 IEEE NEW ORLEANS, LA, USA 21-24 SEPT. 1999, PISCATAWAY, NJ, USA,IEEE, US, 21 September 1999 (1999-09-21), pages 216 - 220, XP010353814, ISBN: 0-7803-5668-3 *
JIUNN-TSAIR CHEN ET AL: "Low complexity joint MLSE receiver in the presence of CCI", COMMUNICATIONS, 1998. ICC 98. CONFERENCE RECORD. 1998 IEEE INTERNATIONAL CONFERENCE ON ATLANTA, GA, USA 7-11 JUNE 1998, NEW YORK, NY, USA,IEEE, US, 7 June 1998 (1998-06-07), pages 704 - 708, XP010284765, ISBN: 0-7803-4788-9 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9036680B2 (en) 1999-09-10 2015-05-19 Interdigital Technology Corporation Interference cancellation in a spread spectrum communication system
CN102263563A (en) * 2010-05-27 2011-11-30 中兴通讯股份有限公司 Decoding soft information processing method and device
CN102263563B (en) * 2010-05-27 2016-03-30 中兴通讯股份有限公司 A kind of processing method of the Soft Inform ation for decoding and device

Also Published As

Publication number Publication date
WO2002023787A2 (en) 2002-03-21
WO2002023787A9 (en) 2003-08-28
AU2002211213A1 (en) 2002-03-26

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