低复杂度的连续相位调制与LDPC联合迭代译码算法

摘要

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.%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 dB的增益。