低复杂度的连续相位调制与LDPC联合迭代译码算法  

A Low Complexity Joint Iterative Decoding Algorithm for CPM and LDPC

作　　者：张凯 

机构地区：[1]西安烽火电子科技有限责任公司,西安710075

出　　处：《电讯技术》2015年第12期1390-1394,共5页Telecommunication Engineering

摘　　要：连续相位调制与低密度奇偶校验(LDPC)码编译码技术在提高频谱利用率的同时能够有效降低发射功率,然而这会增加通信系统的复杂度。为此,提出了一种低复杂度的联合迭代译码算法解决此问题。该算法以符号/比特的可靠度作为内外译码器之间的迭代信息。仿真结果表明,新的联合迭代译码算法的性能与概率域下的算法几乎没有差异,在总迭代次数相同的情况下,采用低复杂度联合迭代的性能相比于未采用联合迭代的性能有约0.75 d B的增益。The technology of Continuous Phase Modulation( CPM) and Low-Density Parity-Check( LDPC) codes can not only improve the spectrum efficiency,but also decrease the transmit power. However it will increase the complexity of communication system. To solve the problem,this paper proposes a reliability-based soft demodulation algorithm. The new algorithm takes the symbol/bit reliability as the information metric between inner decoder and outer decoder. Simulation results show that,the new joint iterative deco-ding algorithm performs as well as the probabilistic algorithm and has about 0 . 75 dB gain compared with decoding algorithm without iterations,with equal total local iterations.

关 键 词：低密度奇偶校验码 连续相位调制 可靠度信息 联合迭代译码 

分 类 号：TN911.3[电子电信—通信与信息系统]