一种基于递归MSK的LDPC码设计准则
doi: 10.3724/SP.J.1146.2005.01214
A New Design Rule of LDPC Codes for Recursive MSK
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摘要: 本文首先给出了基于MSK的LDPC码串行级联系统的模型，叙述了MSK的两种实现结构，分析了基于递归连续相位编码器(RCPE)MSK中的错误相关性和级联Tanner图中的环特性；最后，提出了一种LDPC码设计准则，在该准则下，基于递归MSK的LDPC码串行级联系统可以不采用交织器。仿真性能表明这种设计准则可以减小递归MSK中的错误相关性对性能的影响。Abstract: This paper investigates a serial concatenation of Low-Density Parity-Check (LDPC) codes with Minimum Shift Keying (MSK) when the receiver employs iterative decoding and demodulation. First, the RCPE and NRCPE modes of the MSK modulator are described, then the error correlation in the Recursive CPE (RCPE) MSK demodulator and the overall loop in the joint Tanner graph are analyzed. Finally a new design rule is developed which allows the serially concatenated system not to employ interleavers. Simulation results show that the proposed design rule reduces the impact of the error correlation in a simple and effective way.
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