CMMB中LDPC码的编译码研究及仿真性能分析

CMMB中采用了先进的信道纠错码LDPC码和OFDM调制技术,在移动多媒体电视标准中具有领先地位。通过分析LDPC码的校验矩阵规律,采用适合CMMB标准的改进LU分解编码算法,大大减少了存储资源的使用,并在MATLAB平台的仿真测试环境下,通过最小和译码算法进行译码,测试结果表明,LDPC码非常适用于高速传输系统中,仿真对比得到的最优修正值使译码性能改善,能满足高精度的数字信号传输需要。为CMMB的信道编解码器的硬件设计提供了一套有效的编译码算法方案,具有较好的实用价值。

Research on encode and decode of LDPC used to CMMB system and its performance analyses

CMMB system introduces new technologies such as LDPC codes and OFDM,which have been the direction of the future of development of mobile multimedia TV standard.By introducing the basal rule of LDPC code check matrix briefly,CMMB system based on modified LU decomposition theory was presented,which can reduce the storage resource.In system simulation on Matlab, modified min sum-product decoding algorithm is proposed.The simulation result shows that the LDPC decoder has high efficiency to meet the demand of precision digital signals transmission.Analyzing and contrasting the improved algorithm to find the optimum modified value,this paper provides an effective coding and decoding algorithm scheme for hardware design in CMMB,which has some practical value.