多元域LDPC码在卫星通信中的应用研究

Analysis of Non-Binary LDPC Codes in the Application of Sa-tellite Communications

在卫星通信中,如何提高抗干扰能力是需要重点关注的问题之一。多元域LDPC码是通信界研究的热点课题,较二进制LDPC码有更优的纠错性能。本文从卫星通信的应用角度出发,对利用LU分解进行编码的通用编码算法展开研究,以保证矩阵稀疏性为目标,分析了行主元选取策略。同时研究了多元域LDPC码的迭代译码算法。对多元域LDPC码纠错系统的纠错性能进行了仿真,测试结果表明多元域LDPC码的性能优于信源信息速率和码率相同的二进制LDPC码,为多元域LDPC码在卫星通信中的应用奠定了基础。

In deep space communication system, improving ability of error correction is a key technique. Non-binary LDPC Codes are hotspot and outperform Binary LDPC Codes. Based on application of satellite communications, the universal encoding algorithm based on LU factorization is researched. In order to keep low density of matrix, criteria of row pivot is analyzed. Iterative decoding algorithm is researched. By comparing simulation performance of Non-binary LDPC Codes and Binary LDPC Codes, it shows that Non-binary LDPC Codes are better than Binary LDPC Codes. The result is helpful to application of Non-binary LDPC Codes in satellite communications.