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通信系统通常需要支持多种码率的信道编码以适应不同的信道条件。为了简化系统实现的复杂度,该文提出了一种码长固定、兼容多码率、准循环低密度奇偶校验(QC-LDPC)码的构造方法。该方法利用修正的渐进边增长(PEG)Reed-Solomon(RS)码算法生成母码的校验矩阵,结合校验矩阵的行合并得到具有相同结构的多码率QC-LDPC码的校验矩阵。在译码时多码率LDPC码可以共用同一个译码器,从而大大减少了译码的硬件资源。实验结果表明:该方法生成的多码率LDPC码的性能均优于第二代欧洲数字地面电视广播传输标准(DVB-T2)中对应码率的码,且译码器硬件资源与单码率的LDPC译码器相当。
Communication systems typically require channel coding that supports multiple code rates to accommodate different channel conditions. In order to simplify the complexity of system implementation, this paper proposes a method of constructing a code length fixed, compatible with multi-rate, quasi-cyclic low density parity check (QC-LDPC) code. The method uses a modified Reed-Solomon (RS) code algorithm to generate a check matrix of a mother code, and combines the check matrix rows to obtain a check matrix of a multi-rate QC-LDPC code with the same structure . Multi-rate LDPC codes can share the same decoder when decoding, which greatly reduces the hardware resources for decoding. Experimental results show that the performance of the multi-rate LDPC codes generated by the method is better than the corresponding bit rate codes of the second generation DVB-T2 transmission standard, and the hardware resources of the decoder and the single bit rate LDPC decoder.