基于LDPC码的铁路轨旁设备监测数据可靠传输方法

发布时间：2018-08-28 14:50

【摘要】：针对轨旁监测系统数据传输可靠性要求高,而信息传输易受电力牵引、噪声信号干扰、信号传输衰减等因素影响的问题,基于低密度奇偶校验(LDPC)码研究铁路轨旁设备监测数据的可靠传输方法。LDPC码具有超强的纠错能力,由校验矩阵定义,其纠错能力主要取决于LDPC码的度分布,也就是校验矩阵的行(列)重参数,因此提出基于外信息转移图分析方法的度分布搜索算法,用于确定给定码率下规则LDPC码的最佳度分布参数。在此基础上,结合2种主要铁路轨旁监测数据的特点及其传输需求,提出3套LDPC编码方案并通过仿真计算,验证编码方案的纠错能力。仿真结果表明:给出的LDPC编码方案,可将信息传输的误码率从10-2量级降到10-6以下量级,极大地提升了铁路轨旁设备监测数据传输的可靠性。
[Abstract]:Aiming at the problem that the reliability of data transmission in the rail side monitoring system is high, and the information transmission is easily affected by electric traction, noise signal interference and signal transmission attenuation, etc. Based on low density parity check (LDPC) code the reliable transmission method of monitoring data of railway track side equipment. LDPC-code has super error correction ability. Defined by check matrix, its error correction ability mainly depends on the degree distribution of LDPC code. Therefore, a degree distribution search algorithm based on the external information transfer graph analysis method is proposed to determine the optimal degree distribution parameters of regular LDPC codes at a given bit rate. On this basis, combined with the characteristics and transmission requirements of two main railway track side monitoring data, three sets of LDPC coding schemes are put forward, and the error correction ability of the coding scheme is verified by simulation calculation. The simulation results show that the proposed LDPC coding scheme can reduce the BER of information transmission from 10-2 to less than 10-6, which greatly improves the reliability of monitoring data transmission by rail side equipment.
【作者单位】：中国铁道科学研究院通信信号研究所;
【基金】：中国铁路总公司科技研究开发计划重点项目(2015X007-D)
【分类号】：TN911.22;U284.91

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