结构半随机LDPC码的递增冗余HARQ方案

Incremental Redundancy Hybrid ARQ Scheme Based on Structured Semi-Random LDPC Codes and its Performance Analysis

提出了结构半随机LDPC码,分析了其在不同码率时,编、译码具有兼容性的特性。介绍了基于结构半随机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,结构半随机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。

Structured semi-random LDPC cede is presented, and its character with rate- compatible is analyzed. An incremental redundancy hybrid ARQ （HARQ） scheme based on structured semi - random LDPC cedes is introduced. The throughput of the new HARQ scheme is studied and the closed - form solutions are obatind. 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 SSR - LDPCis the same as those based on random LDPC. But the encoding and decoding of SSR - LDPC is simpler, and the wider range changing of cede rates of SSR - LDPC can be obtained than those of random LDPC.