Resolving the Feedback Bottleneck of Multi-Antenna Coded Caching

2018/11/09 by Lampiris, Eleftherios, Bazco-Nogueras, Antonio, Elia, Petros
#FOS: Computer and information sciences #Information Theory (cs.IT)

paper · doi:10.48550/arxiv.1811.03935

Abstract

Multi-antenna cache-aided wireless networks have been known to suffer from a severe feedback bottleneck, where achieving the maximal Degrees-of-Freedom (DoF) performance required feedback from all served users. These costs matched the caching gains and thus scaled with the number of users. In the context of the L-antenna MISO broadcast channel with K receivers having normalized cache size γ, we pair a fundamentally novel algorithm together with a new information-theoretic converse, and identify the optimal tradeoff between feedback costs and DoF performance, by showing that having CSIT from only C

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