Coded caching is an information theoretic scheme to reduce high peak hours traffic by partially prefetching files in the users local storage during low peak hours. This paper considers heterogeneous decentralized caching systems where cache of users and content library files may have distinct sizes. The server communicates with the users through a Gaussian broadcast channel. The main contribution of this paper is a novel modulation strategy to map the multicast messages generated in the coded caching delivery phase to the symbols of a signal constellation, such that users can leverage their cached content to demodulate the desired symbols with higher reliability. For the sake of simplicity, in this paper we focus only on uncoded modulation and symbol-by-symbol error probability. However, our scheme in conjunction with multilevel coded modulation can be extended to channel coding over a larger block lengths.

中文翻译：

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高斯广播信道上异构编码缓存的缓存辅助调制

编码缓存是一种信息理论方案，通过在低高峰时段部分预取用户本地存储中的文件来减少高峰时段流量。本文考虑异构分散缓存系统，其中用户和内容库文件的缓存可能具有不同的大小。服务器通过高斯广播信道与用户进行通信。本文的主要贡献是一种新颖的调制策略，将编码缓存交付阶段生成的多播消息映射到信号星座的符号，以便用户可以利用其缓存内容以更高的可靠性解调所需的符号。为简单起见，本文只关注未编码调制和逐个符号错误概率。然而，