论文标题
高斯广播频道上的异质编码缓存的缓存调制
Cache-Aided Modulation for Heterogeneous Coded Caching over a Gaussian Broadcast Channel
论文作者
论文摘要
编码的缓存是一种信息理论方案，可通过在低峰时段在用户本地存储中部分预取文件来降低高峰小时流量。本文考虑了异质分散的缓存系统，在这些缓存中，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频道与用户通信。本文的主要贡献是一种新颖的调制策略，旨在将编码的缓存输送阶段中生成的多播消息映射到信号星座的符号中，以便用户可以利用其缓存的内容来解码具有更高可靠性的所需符号。为了简单起见，在本文中，我们仅关注未编码的调制和符号符号误差概率。但是，我们的方案与多级编码的调制结合使用可以扩展到更大的块长度上的通道编码。
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.
