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Coding performance of hybrid ARQ schemes

机译：混合ARQ方案的编码性能

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摘要

We develop a unified performance metric and detailed analysis for hybrid automatic repeat request (HARQ) schemes based on incremental redundancy (IR) and Chase combining (CC). The general result is applicable to both symbol-based and bit-interleaved coded modulations, to HARQ processes based on rateless and fixed-rate mother codes, and IR schemes with and without a self-decodability restriction. The analysis shows that IR over CC coding gains tend to increase with the initial coding rate, but decrease with the signal-to-noise (SNR) variation between retransmissions. The gains can also be diminished when a fixed-rate mother code is used or when the self-decodability criterion is imposed. The theoretical prediction is compared with observed gains at 10% codeword error rates based on turbo-coding simulations. For scenarios with moderately varying SNR between retransmissions, the analytical model tracks actual simulation results very well. However, when the SNR varies widely and the systematic part of the turbo codeword is effectively erased, the CC scheme could, in fact, outperform some IR schemes. For these scenarios, which can be induced by fast time-varying fading or long retransmission delays, the self-decodable IR and the CC schemes prove to be more robust without much performance comprise. Finally, we discuss adaptive improvement to the conventional IR schemes based on the analytical result.
机译：我们基于增量冗余（IR）和大通组合（CC），为混合自动重发请求（HARQ）方案开发了统一的性能指标和详细分析。总体结果适用于基于符号的编码和比特交织的编码调制，适用于基于无速率和固定速率母码的HARQ进程，以及具有和不具有自解码能力限制的IR方案。分析表明，IR over CC编码增益趋于随初始编码速率而增加，但随重传之间的信噪比（SNR）变化而降低。当使用固定速率的母码或施加自可解码性准则时，增益也可能减小。根据涡轮编码仿真，将理论预测与10％码字错误率下的观察到的增益进行比较。对于重传之间SNR稍有变化的情况，分析模型可以很好地跟踪实际仿真结果。但是，当SNR发生很大变化并且有效地消除了Turbo码字的系统部分时，CC方案实际上可能胜过某些IR方案。对于这些可能由快速随时间变化的衰落或较长的重传延迟引起的场景，可自解码的IR和CC方案在没有太多性能的情况下被证明更加健壮。最后，基于分析结果，我们讨论了对常规红外方案的自适应改进。

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