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Centralized and Decentralized Cache-Aided Interference Management in Heterogeneous Parallel Channels | IEEE Journals & Magazine | IEEE Xplore

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


Abstract:

We consider the problem of cache-aided interference management in a network consisting of KT single-antenna transmitters and KR single-antenna receivers, where each node ...Show More

Abstract:

We consider the problem of cache-aided interference management in a network consisting of KT single-antenna transmitters and KR 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.
Published in: IEEE Transactions on Communications ( Volume: 68, Issue: 3, March 2020)
Page(s): 1881 - 1896
Date of Publication: 18 December 2019

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