基于LDPC码的超短波高速数传系统性能研究

摘要

为满足超短波高速数传系统的性能要求,对发送序列进行LDPC编码,并选取修正最小和译码算法进行译码.通过自适应均衡技术消除多径干扰,并将接收机分为DFE均衡器和LDPC译码器两部分.基于Matlab仿真平台,构建超短波高速数传系统仿真模型,对典型VHF信道模型下的传输性能进行仿真及分析.仿真结果表明,准循环LDPC码在中高码率下仍能获得较大的编码增益,基于LDPC码的超短波高速数传系统可获得优异的传输性能,具有良好的工程应用前景.%In order to satisfy the performance requirement of the VHF high-speed data transmission system,the sending se-quence is coded with LDPC,and the modified min-sum(MMS)decoding algorithm is selected for decoding. The adaptive equa-lization technique is used to eliminate the multipath interference,and divide the receiver into the DFE equalizer and LDPC de-coder. On the basis of Matlab simulation platform,the simulation model of the VHF high-speed data transmission system was constructed,and the transmission performance of the typical VHF channel model is simulated and analyzed. The simulation re-sults show that the quasi-cyclic LDPC code with the medium and high code rate can obtain better coding gain,and the VHF high-speed data transmission system based on LDPC code has good high-speed data transmission performance and good engineering application prospect.