迭代硬判决反馈的LDPC级联MDPSK解调译码算法

Iterative Decision-Feedback Differential Demodulation of MDPSK Concatenated with LDPC Codes

该文给出了瑞利衰落信道条件下LDPC级联MDPSK的接收机结构,研究了在不考虑信道状态条件下基于硬判决反馈的迭代检测译码算法,该算法相对于传统的差分解调和译码,复杂度几乎没有增加。仿真结果表明,这种方法在迭代4次的情况下,在误比特率为10?4时与传统的解调方法相比,可以提供2.2dB的增益。

A receiver structure of M-ary Differential Phase-Shift Keying （MDPSK） concatenated with Low-Density Parity Check Codes in flat Rayleigh fading channels is proposed. An iterative hard decision-feedback detection algorithm also is analyzed ignorant of channel state information. Compared with conventional differential demodulation decoding one, this algorithm almost has no increasing in complexity and simulation results also confirm that it has 2.2dB gain at BER of 10^-4 when iterative four times.