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战术数据链系统能够提高部队信息化作战能力,其中信道编码技术是保证消息传输可靠性的关键技术之一.构建了一种新的战术数据链系统,系统采用低密度奇偶校验(LDPC,Low-Density Parity-Check)码方案,LDPC码是适用于传输可靠性要求高的通信系统的新型码组.介绍了LDPC码方案中的和积算法,描述了系统的传输模型,分析了系统在固定频率和加性白色高斯噪声(AWGN,Additive White Gaussian Noise)信道条件下的链路性能.利用计算机进行蒙特卡罗仿真,结果表明:在AWGN信道和瑞利衰落信道下,LDPC编码方案可以有效地降低数据链系统的误比特率,取得比采用里德.所罗门编码的联合战术信息分发系统更好的误码性能.LDPC码作为信道编码技术的备选码组,为进一步提高战术数据链的可靠性提供了一种解决方案.
Tactical data link system can improve the capability of military informatization, and channel coding technology is one of the key technologies to ensure the reliability of message transmission.A new tactical data link system is constructed, which uses low density parity check (LDPC, Low -Density Parity-Check (LDPC) code, which is a new code group which is suitable for the communication system with high reliability requirements.This paper introduces the Sum-Sum algorithm in the LDPC code scheme, describes the transmission model of the system, Frequency and Additive White Gaussian Noise (AWGN) channel performance.The Monte Carlo simulation with computer shows that under AWGN channel and Rayleigh fading channel, the LDPC coding scheme can effectively Reduce the bit error rate of the data link system and achieve better error performance than the joint tactical information distribution system using Reed Solomon code.LDPC code is an alternative code group for the channel coding technology and further improves the reliability of the tactical data link Sex provides a solution.