In this letter, we concern the self-decoding capability of polar-coded hybrid automatic repeat request (Polar-HARQ) schemes. The proposed self-decoding method enables the incremental redundancy (IR) based Polar-HARQ to recover all source bits solely using the retransmission codewords. It provides an extra decoding chance when the joint decoding attempt fails. With this, the final decoding success probability increases such that the number of retransmissions can be reduced and the system latency goes down. We derive one necessary condition for the successful self-decoding, which can also guide the optimization of Polar-HARQ. Three mainstream Polar-HARQ schemes are compared from the perspective of self-decoding. Simulation results validate the analysis.

中文翻译：

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极性编码HARQ的自解码

在这封信中，我们关注极性编码混合自动重传请求 (Polar-HARQ) 方案的自解码能力。所提出的自解码方法使基于增量冗余 (IR) 的 Polar-HARQ 能够仅使用重传码字来恢复所有源比特。当联合解码尝试失败时，它提供了额外的解码机会。这样，最终解码成功的概率就会增加，从而可以减少重传次数，降低系统延迟。我们推导出成功自解码的一个必要条件，它也可以指导 Polar-HARQ 的优化。从自解码的角度比较了三种主流的Polar-HARQ方案。仿真结果验证了分析。