采用删除低密度校验码的比特交织编码调制技术研究

Rate-Compatible Punctured Low-Density Parity-Check Codes with Bit-Interleaved Coded Modulation

本文从系统的角度提出了采用删除低密度校验码(LDPC)作为成员码的比特交织编码调制(BICM)系统方案,其中删除模式分别采用通过优化算法确定LDPC码的优化删除分布和随机删除两种方案。仿真结果表明,该系统方案的性能与系统BICM容量之间的距离小于1dB,从而清楚地说明了该系统能够很好地适应信道的变化,在不同的信道条件下均保持了良好的性能。

A new bit-interleaved coded modulation （BICM） scheme based on punctured low-density parity-check （LDPC） codes is designed in this paper. The proposed system either constructs the component LDPC code based on the criterion for the AWGN channel followed by optimal parity puncturing, or creates the component LDPC code based on the criterion for the BEC channel followed by random puncturing. Simulation results show that the proposed system performs within 1 dB bove the BICM capacity across a range of rates. Therefore, the system can efficiently adapt to the varying of channels and perform excellentlly under different conditions.