一种LDPC编码高阶调制系统的联合解调解码方法

A Joint Demodulation and Decoding Algorithm for High Order LDPC Coded Modulations

该文用一种级联码模型描述了LDPC编码高阶调制系统。该级联码模型以LDPC码为外码,二-十进制转换码为内码,再加一个删余模块构成。基于这种级联码模型,该文给出了其联合校验方程和二分图,并提出了级联码置信度传播算法,实现了LDPC编码高阶调制系统的联合解调解码。仿真表明,该文提出的联合解调解码算法有效地改进了LDPC编码高阶调制系统的性能。

A concatenated code model is proposed for high-order Low-Density Parity-Check （LDPC） coded- modulation scheme. This model is comprised of a serial concatenation of an outer LDPC encoder, an inner Binary-Decimal Conversion （BDC） encoder and a puncture device. A joint parity-check matrix is derived for the concatenated code, and the corresponding joint demodulation and decoding algorithm, named Concatenated-Code Belief Propagation （CCBP）, is presented. Simulation results show that this LDPC coded modulation scheme with the CCBP algorithm provides effective improvements relative to the Bit Interleaved Coded Modulation （BICM） scheme for high-order modulations.