NDLI: Improve the Performance of LDPC Coded QAM by Selective Bit Mapping in Terrestrial Broadcasting System

Content Provider	IEEE Xplore Digital Library
Author	Liang Gong Lin Gui Bo Liu Bo Rong Yin Xu Yiyan Wu Wenjun Zhang
Copyright Year	1963
Abstract	In this paper, we employ selective bit mapping to improve the performance of the LDPC coded QAM scheme for terrestrial DTV broadcasting system. The threshold of message-passing decoding can be considerably lowered by selectively mapping the binary components of LDPC codeword to the positions in the m-tuples to be mapped into 2mQAM symbols. In our approach, the mapping pattern is described by bit-mapping polynomials, based on which density evolution can be applied. The optimization algorithm is developed with two implementation concerns, using the Chinese DTMB standard as an example. Numerical results illustrate that our proposed approach can improve the decoding threshold by 0.05 dB to 0.499 dB depending on the code rate and the order of QAM modulation. Simulation results show that the actual BER improvement varies from 0.09 dB to 0.6 dB with different code-modulation combinations in both single-carrier and OFDM modes.
Sponsorship	IEEE Broadcast Technology Society
Starting Page	263
Ending Page	269
Page Count	7
File Size	440237
File Format	PDF
ISSN	00189316
Volume Number	57
Issue Number	2
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-06-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Decoding Quadrature amplitude modulation Polynomials Optimization Iterative decoding PAM/QAM modulation Bit mapping decoding threshold density evolution DTMB LDPC codes
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering Media Technology

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