Title:
LOG-LIKELIHOOD RATIO CALCULATION CIRCUIT, RECEPTION APPARATUS, AND LOG-LIKELIHOOD RATIO CALCULATION METHOD
Document Type and Number:
WIPO Patent Application WO/2017/158725
Kind Code:
A1
Abstract:
An LLR calculation unit is provided with: a range detection unit (211) that detects which range a reception signal after a modulo operation falls in among a plurality of ranges determined on the basis of a boundary value in the modulo operation; a coefficient determination unit (212) that determines, on the basis of a detection result from the range detection unit (211), coefficients to be used in calculation of a log-likelihood ratio of the most significant bit in quadrature amplitude modulation of the reception signal after the modulo operation; and an LLR computation unit (213) that computes the log-likelihood ratio of the most significant bit using the reception signal after the modulo operation and the coefficients.
Inventors:
NISHIMOTO HIROSHI (JP)
Application Number:
PCT/JP2016/058156
Publication Date:
September 21, 2017
Filing Date:
March 15, 2016
Export Citation:
Assignee:
MITSUBISHI ELECTRIC CORP (JP)
International Classes:
H04J99/00; H03M13/45; H04B7/04; H04L27/38
Other References:
SHIGENORI KINJO: "A low complexity soft demapping method for expanded M-QAM constellations", CIRCUITS AND SYSTEMS (APCCAS) , 2014 IEEE ASIA PACIFIC CONFERENCE ON, 17 November 2014 (2014-11-17) - 24 November 2014 (2014-11-24), pages 137 - 140, XP055537489, Retrieved from the Internet
YASUHIKO TANABE ET AL.: "An Error Reduction Method of Modulo Operation for a MIMO Broadcast Channel Using Tomlinson-Harashima Precoding in Low SNR Region", 2008 NEN IEICE COMMUNICATIONS SOCIETY CONFERENCE KOEN RONBUNSHU 1, 2 September 2008 (2008-09-02), pages S-1 - S-2, XP000761097
AKINORI OHASHI ET AL.: "A Study on Low- Complexity Calculation of Log Likelihood Ratio for Quardrature Amplitude Modulation", 2013 NEN IEICE COMMUNICATIONS SOCIETY CONFERENCE TSUSHIN KOEN RONBUNSHU 1 , IEICE, 20 September 2013 (2013-09-20), pages 368, XP000990996
See also references of EP 3432496A4
MAX H. M. COSTA: "Writing on Dirty Paper", IEEE TRANSACTIONS ON INFORMATION THEORY, vol. 29, no. 3, May 1983 (1983-05-01), pages 439 - 441
M. TOMLINSON: "NEW AUTOMATIC EQUALISER EMPLOYING MODULO ARITHMETIC", ELECTRONICS LETTERS, vol. 7, March 1971 (1971-03-01), pages 138 - 139, XP000761097
H. HARASHIMA; H. MIYAKAWA: "Matched-Transmission Technique for Channels With Intersymbol Interference", IEEE TRANSACTIONS ON COMMUNICATIONS, vol. 20, no. 4, August 1972 (1972-08-01), pages 774 - 779, XP000990996
H. MATSUOKA; S. SAMPEI; N. MORINAGA; Y. KAMIO: "Adaptive Modulation System with Punctured Convolutional Code for High Quality Personal Communication Systems", IEICE TRANS. COMMUN., vol. E79-B, no. 3, March 1996 (1996-03-01), pages 328 - 334, XP000588456
R. PYNDIAH; A. PICART; A. GLAVIEUX: "PERFORMANCE OF BLOCK TURBO CODED 16-QAM AND 64-QAM MODULATIONS", PROC. GLOBECOM'95, vol. 2, November 1995 (1995-11-01), pages 1039 - 1043, XP010164530, DOI: doi:10.1109/GLOCOM.1995.502563
E.C.Y. PEH; Y.-C. LIANG: "Power and Modulo Loss Tradeoff with Expanded Soft Demapper for LDPC Coded GMD-THP MIMO Systems", IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS, vol. 8, no. 2, February 2009 (2009-02-01), pages 714 - 724, XP011252004
S. KINJO: "An efficient soft demapper for Tomlinson-Harashima precoded systems", IEICE COMMUNICATIONS EXPRESS, vol. 4, no. 3, March 2015 (2015-03-01), pages 89 - 94
YASUHIKO TANABE ET AL.: "An Error Reduction Method of Modulo Operation for a MIMO Broadcast Channel Using Tomlinson-Harashima Precoding in Low SNR Region", 2008 NEN IEICE COMMUNICATIONS SOCIETY CONFERENCE KOEN RONBUNSHU 1, 2 September 2008 (2008-09-02), pages S-1 - S-2, XP000761097
AKINORI OHASHI ET AL.: "A Study on Low- Complexity Calculation of Log Likelihood Ratio for Quardrature Amplitude Modulation", 2013 NEN IEICE COMMUNICATIONS SOCIETY CONFERENCE TSUSHIN KOEN RONBUNSHU 1 , IEICE, 20 September 2013 (2013-09-20), pages 368, XP000990996
See also references of EP 3432496A4
MAX H. M. COSTA: "Writing on Dirty Paper", IEEE TRANSACTIONS ON INFORMATION THEORY, vol. 29, no. 3, May 1983 (1983-05-01), pages 439 - 441
M. TOMLINSON: "NEW AUTOMATIC EQUALISER EMPLOYING MODULO ARITHMETIC", ELECTRONICS LETTERS, vol. 7, March 1971 (1971-03-01), pages 138 - 139, XP000761097
H. HARASHIMA; H. MIYAKAWA: "Matched-Transmission Technique for Channels With Intersymbol Interference", IEEE TRANSACTIONS ON COMMUNICATIONS, vol. 20, no. 4, August 1972 (1972-08-01), pages 774 - 779, XP000990996
H. MATSUOKA; S. SAMPEI; N. MORINAGA; Y. KAMIO: "Adaptive Modulation System with Punctured Convolutional Code for High Quality Personal Communication Systems", IEICE TRANS. COMMUN., vol. E79-B, no. 3, March 1996 (1996-03-01), pages 328 - 334, XP000588456
R. PYNDIAH; A. PICART; A. GLAVIEUX: "PERFORMANCE OF BLOCK TURBO CODED 16-QAM AND 64-QAM MODULATIONS", PROC. GLOBECOM'95, vol. 2, November 1995 (1995-11-01), pages 1039 - 1043, XP010164530, DOI: doi:10.1109/GLOCOM.1995.502563
E.C.Y. PEH; Y.-C. LIANG: "Power and Modulo Loss Tradeoff with Expanded Soft Demapper for LDPC Coded GMD-THP MIMO Systems", IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS, vol. 8, no. 2, February 2009 (2009-02-01), pages 714 - 724, XP011252004
S. KINJO: "An efficient soft demapper for Tomlinson-Harashima precoded systems", IEICE COMMUNICATIONS EXPRESS, vol. 4, no. 3, March 2015 (2015-03-01), pages 89 - 94
Attorney, Agent or Firm:
TAKAMURA, Jun (JP)
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