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本文研究了混合自动重传(hybrid auto matic repeat request,H-ARQ)信道上全分集低密度奇偶校验(low density parity check,LDPC)码的构造与性能.首先分析了H-ARQ信道的中断概率及其固有分集,然后构造了在H-ARQ信道上能取得全分集的LDPC码,新构造的码字采用根校验节点把原始传输与重传联系起来,从而获得全分集.接着,给出了所构造码字的密度演化过程、度的优化以及误字率(WER)性能.仿真结果表明,本文所提算法不仅能取得全分集,而且具有优异的性能.
In this paper, we study the construction and performance of low density parity check (LDPC) codes on hybrid auto matic repeat request (H-ARQ) channels.At first, we analyze the interruption of H-ARQ channels Probability and its inherent diversity, and then construct an LDPC code that can achieve full diversity on the H-ARQ channel. The newly constructed codeword uses the root check node to associate the original transmission with the retransmission so as to obtain full diversity. Then, The density evolution, degree optimization and WER performance of the constructed codewords are presented.The simulation results show that the proposed algorithm can not only achieve full diversity but also have excellent performance.