NDLI: Selective bit mapping for Chinese DTMB LDPC coded QAM modulation scheme

Content Provider	IEEE Xplore Digital Library
Author	Liang Gong Lin Gui Bo Liu Bo Rong Yin Xu Yiyan Wu Wenjun Zhang
Copyright Year	2011
Description	Author affiliation: Shanghai Jiao Tong University, China (Liang Gong; Lin Gui; Bo Liu; Yin Xu; Wenjun Zhang) \|\| Communications Research Centre, Ottawa, Canada (Bo Rong; Yiyan Wu)
Abstract	In this paper, we introduce selective-bit mapping to improve the performance of the LDPC coded QAM modulation scheme for Chinese Digital Terrestrial Television Broadcasting (DTMB) system. The threshold of message-passing decoding can be lowered by matching the binary components of LDPC codeword to the positions in the m-tuples to be mapped into $2^{m}QAM$ symbols. By our approach, the pattern of mapping is described by bit-mapping polynomials, based on which density evolution using Gaussian approximation can be applied. We optimize the bit mapping polynomials for the LDPC codes of the Chinese DTMB standard. Numerical results illustrate that by the proposed approach the decoding threshold can be lowered by 0.05dB to 0.499dB by different combinations of code rate and order of QAM modulations. Simulation results show that the actual BER improvement varies from 0.09dB to 0.6dB in single-carrier and OFDM modes.
Starting Page	1
Ending Page	6
File Size	954864
Page Count	6
File Format	PDF
ISBN	9781612841212
ISSN	21555052
e-ISBN	9781612841229
e-ISBN	9781612841205
DOI	10.1109/BMSB.2011.5954932
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-06-08
Publisher Place	Germany
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Bit mapping Quadrature amplitude modulation PAM/QAM Modulation Tin LDPC Codes Density Evolution Parity check codes Chinese DTMB standard Demodulation Decoding threshold
Content Type	Text
Resource Type	Article

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3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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