| PCM/FM遥测系统下LDPC译码算法研究 |
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| 引用本文： | 张丽丽,赵泽茂,包建荣. PCM/FM遥测系统下LDPC译码算法研究[J]. 机电工程, 2011, 28(1): 63-66 |
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| 作者姓名： | 张丽丽 赵泽茂 包建荣 |
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| 作者单位： | 杭州电子科技大学,通信工程学院,浙江,杭州,310018 |
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| 基金项目： | 国家自然科学基金委员会，中国工程物理研究院联合基金 |
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| 摘 要： | 低密度奇偶校验(LDPC)码译码过程中,当信噪比低于译码阈值时误码率趋于一非零常数,此时继续进行消息迭代不会改善码字误码性能。针对这一问题,提出了一种改进的译码方法,一旦译码结果出现多次重复,即令迭代停止,大幅减少了迭代次数。将LDPC码及改进的译码方法应用于脉冲编码调制/调频(PCM/FM)遥测系统,并从复杂度和误码率两个方面进行了对比分析。仿真结果表明,PCM/FM遥测系统下,利用改进方法的归一化最小和算法误码性能较好,而且该算法易于硬件实现。
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| 关 键 词： | 脉冲编码调制/调频 低密度奇偶校验 译码 迭代次数 |
Research on decoding of LDPC codes in the PCM/FM reentry telemetry system |
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| ZHANG Li-li,ZHAO Ze-mao,BAO Jian-rong. Research on decoding of LDPC codes in the PCM/FM reentry telemetry system[J]. Mechanical & Electrical Engineering Magazine, 2011, 28(1): 63-66 |
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| Authors: | ZHANG Li-li ZHAO Ze-mao BAO Jian-rong |
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| Affiliation: | (College of Communication Engineering,Hangzhou Dianzi University,Hangzhou 310018,China) |
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| Abstract: | In the phase of decoding,when the SNR is lower than the decoding threshold,to continuously information iterative can＇t improve the BER performance of low density parity check（LDPC） codes.In order to solve this problem,an improved decoding method was proposed.In this method,the decoding was terminated once the results repeating,and the iterative times was decreased.LDPC codes and the new decoding method were applied to pulse code modulation/frequency modulation（PCM/FM） telemetry system,then complexity and the BER performance were analyzed.Simulations show that,under the PCM/FM telemetry system,the normalized min-sum algorithm using the improved decoding method shows excellent BER performance.Meanwhile,this algorithm is easy to hardware implementation. |
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| Keywords: | pulse code modulation/frequency modulation（PCM/FM） low density parity check（LDPC） codes decoding iterative times |
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