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Coarse Network Coding: A Simple Relay Strategy for Two-User Gaussian Interference Channels

机译:粗略网络编码:两用户高斯干扰信道的简单中继策略

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摘要

Reminiscent of the parity function in network coding for the butterfly network, it is shown that forwarding an even or odd indicator bit for a scalar quantization of a relay observation recovers 1 bit of information at the two destinations in a noiseless interference channel where interference is treated as noise. Inspired by this observation, a scalar quantization-binning strategy for a two-user interference relay channel is proposed where the relay simultaneously helps both users using an out-of-band link of constant rate $R_{0}$. For the proposed strategy, we devise practical coding schemes using low-density parity-check codes for two scenarios: 1) a matched scenario where the input alphabet of the interference signal is known to the destination decoder, and 2) a mismatched scenario that assumes no such knowledge. In both scenarios, we show that our strategy significantly improves the performance. We also present a theoretical analysis of our coding scheme using generalized mutual information.
机译:让人联想到蝶形网络的网络编码中的奇偶校验功能,它表明转发用于中继观测的标量量化的偶数或奇数指示符比特可在处理干扰的无噪声干扰信道的两个目的地恢复1位信息作为噪音。受此观察的启发,提出了一种针对两用户干扰中继信道的标量量化合并策略,其中中继同时帮助两个用户使用恒定速率$ R_ {0} $的带外链路。对于所提出的策略,我们针对两种情况设计了使用低密度奇偶校验码的实用编码方案:1)匹配的情况,其中干扰信号的输入字母对于目标解码器是已知的; 2)不匹配的情况假设没有这样的知识。在这两种情况下,我们都表明我们的策略可以显着提高性能。我们还提出了使用广义互信息的编码方案的理论分析。

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