低复杂度的连续相位调制与LDPC联合迭代译码算法

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。

A low complexity joint iterative decoding algorithm for CPM and LDPC

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 decoding 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.