基于并行级联LDPC码的递增冗余HARQ方案及性能分析

Incremental redundancy Hybrid ARQ schemes based on parallel concatenated LDPC codes and its performance analysis

并行级联LDPC码是由多个码率不同的子码,经并行级联后得到的码率可变的LDPC码。本文提出了基于并行级联LDPC码的递增冗余HARQ方案,给出了这种方案的吞吐量性能封闭解。在AWGN信道和Rayleigh衰落信道下,通过仿真将新方案的性能和随机LDPC码的性能进行了比较。结果显示,并行级联LDPC码的递增冗余HARQ方案性能接近随机LDPC码,但编、译码更简单,参数选择范围更广。

Parallel Concatenated LDPC codes which combine of different rate component codes are Rate-compatible codes. An Incremental redundancy hybrid ARQ scheme based on parallel concatenated LDPC codes is introduced. We study the throughput of the new HARQ scheme and obtain the closed_form solutions. Furthermore, the throughput of the new HARQ scheme is simulated. It shows that for arbitrary block fading channel, comprising AWGN channel, the performance of IR HARQ schemes based on PC_LDPC is same as those based on random LDPC. But the encoding and decoding of PC_LDPC is simpler, and the wider range changing of code rates of PC LDPC can be obtained than those of random LDPC.