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Journal of Applied Sciences ›› 2011, Vol. 29 ›› Issue (6): 551-558.doi: 10.3969/j.issn.0255-8297.2011.06.001

• Communication Engineering •     Next Articles

Joint Optimization Algorithm for Protograph LDPC Codes

FANG Yi1, WANG Lin1, CHEN Ping-ping2, XIAO Min1   

  1. 1. Department of Communication Engineering, Xiamen University, Xiamen 361005, Fujian Province, China
    2. Department of Electronic Engineering, Xiamen University, Xiamen 361005, Fujian Province, China
  • Received:2011-01-04 Revised:2011-03-29 Online:2011-11-30 Published:2011-11-29
  • About author:方毅，博士生，研究方向：信道纠错编码与信息论，E-mail: fangyi1986812@163.com；王琳，教授，博导，研究方向：通信物理层算法设计分析与实现，E-mail: wanglin@xmu.edu.cn

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Abstract:

According to the requirements and characteristic of space communication, protograph low-density parity-check (LDPC) codes have been proposed by Jet Propulsion Laboratory (JPL), which have better performance than conventional LDPC codes. In this paper, we propose a joint optimization algorithm for protograph LDPC codes, aiming at lowering the error floor of protograph LDPC codes, while maintaining good perfor ance at waterfall region without increasing encoding and decoding complexity. Theoretical analysis and simulation indicate that the repeat accumulate (RA) and accumulate repeat accumulate (ARA) codes designed by using the proposed algorithm have a remarkable coding-gain, and a lower error floor, as compared with the conventional RA and accumulated repeat by-4-jagged accumulate (AR4JA) codes at the high SNR region.

Key words: protograph low-density parity-check codes, optimization algorithm, coding gain, bit error rate, error floor

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