Centralized and Decentralized Cache-Aided Interference Management in Heterogeneous Parallel Channels

2018/12/04 by Piovano, Enrico, Joudeh, Hamdi, Clerckx, Bruno
#FOS: Computer and information sciences #Information Theory (cs.IT)

paper · doi:10.48550/arxiv.1812.01469

Abstract

We consider the problem of cache-aided interference management in a network consisting of K_T single-antenna transmitters and K_R single-antenna receivers, where each node is equipped with a cache memory. Transmitters communicate with receivers over two heterogenous parallel subchannels: the P-subchannel for which transmitters have perfect instantaneous knowledge of the channel state, and the N-subchannel for which the transmitters have no knowledge of the instantaneous channel state. Under the assumptions of uncoded placement and separable one-shot linear delivery over the two subchannels, we characterize the optimal degrees-of-freedom (DoF) to within a constant multiplicative factor of 2. We extend the result to a decentralized setting in which no coordination is required for content placement at the receivers. In this case, we characterize the optimal one-shot linear DoF to within a factor of 3.

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