Centralized and decentralized cache-aided interference management in heterogeneous parallel channels

Enrico Piovano, Hamdi Joudeh, Bruno Clerckx (Corresponding author)

Research output: Contribution to journalArticleAcademicpeer-review

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.

Original languageEnglish
Article number8936332
Pages (from-to)1881-1896
Number of pages16
JournalIEEE Transactions on Communications
Volume68
Issue number3
DOIs
Publication statusPublished - Mar 2020
Externally publishedYes

Keywords

  • Coded caching
  • hybrid CSIT
  • linear degrees-of-freedom
  • parallel channels
  • wireless caching

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