In modern communication systems with feedback, there are increasingly more scenarios where the transmitter has much less power than the receiver (e.g., medical implant devices), which we refer to as noise-asymmetric channels. For such channels, the feedback link is of higher quality than the forward link. However, feedback schemes for cellular communications, such as hybrid ARQ, do not fully utilize the high-quality feedback link. To this end, we introduce Compressed Error Hybrid ARQ, a generalization of hybrid ARQ tailored for noise-asymmetric channels; the receiver sends its estimated message to the transmitter, and the transmitter harmoniously switches between hybrid ARQ and compressed error retransmission. We show that our proposed method significantly improves reliability, latency, and spectral efficiency compared to the conventional hybrid ARQ in various practical scenarios where the transmitter is resource-constrained.

翻译：在现代通信系统中,有反馈的现代通信系统中,发射机的功率比接收器(例如医疗植入装置)低得多的情况越来越多,我们称之为噪音对称通道;对于这些频道,反馈联系的质量高于前方连接;然而,诸如混合ARQ等移动电话通信的反馈计划没有充分利用高质量的反馈联系;为此,我们引入压缩错误混合ARQ,将混合ARQ用于噪音对称频道;接收器向发射机发送其估计信息,发射机在混合ARQ和压缩错误再传输之间和谐开关。我们表明,在发射机受资源限制的各种实际情况下,与常规混合ARQ相比,我们拟议的方法大大提高了可靠性、延迟度和光谱效率。