Special Section on Satellite Data Compression

Joint nonbinary low-density parity-check codes and modulation diversity over fading channels

[+] Author Affiliations
Zhiping Shi

University of Electronic Science and Technology of China, National Key Lab of Communication, Section 2, No.4, Jianshe North Road, Chengdu, Sichuan 610054 China

Tiffany Jing Li

Lehigh University, Department of Electrical and Computer Engineering, 19 Memorial Dr. West, Bethlehem, PA 18015

Zhongpei Zhang

University of Electronic Science and Technology of China, National Key Lab of Communication, Section 2, No.4, Jianshe North Road, Chengdu, Sichuan 610054 China

J. Appl. Remote Sens. 4(1), 041780 (September 14, 2010). doi:10.1117/1.3496488
History: Received November 29, 2009; Revised July 10, 2010; Accepted September 2, 2010; September 14, 2010; Online September 14, 2010
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Abstract

A joint exploitation of coding and diversity techniques to achieve efficient, reliable wireless transmission is considered. The system comprises a powerful non-binary low-density parity-check (LDPC) code that will be soft-decoded to supply strong error protection, a quadratic amplitude modulator (QAM) that directly takes in the non-binary LDPC symbols and a modulation diversity operator that will provide power- and bandwidth-efficient diversity gain. By relaxing the rate of the modulation diversity rotation matrices to below 1, we show that a better rate allocation can be arranged between the LDPC codes and the modulation diversity, which brings significant performance gain over previous systems. To facilitate the design and evaluation of the relaxed modulation diversity rotation matrices, based on a set of criteria, three practical design methods are given and their point pairwise error rate are analyzed. With EXIT chart, we investigate the convergence between demodulator and decoder.A rate match method is presented based on EXIT analysis. Through analysis and simulations, we show that our strategies are very effective in combating random fading and strong noise on fading channels.

© 2010 Society of Photo-Optical Instrumentation Engineers

Topics

Modulation

Citation

Zhiping Shi ; Tiffany Jing Li and Zhongpei Zhang
"Joint nonbinary low-density parity-check codes and modulation diversity over fading channels", J. Appl. Remote Sens. 4(1), 041780 (September 14, 2010). ; http://dx.doi.org/10.1117/1.3496488


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