Cache-aided communications with multiple antennas at finite SNR

Itsik Bergel, Soheil Mohajer

Research output: Contribution to journalArticlepeer-review

14 Scopus citations


We study the problem of cache-aided communication for cellular networks with multi-user and multiple antennas at finite signal-to-noise ratio. Users are assumed to have non-symmetric links, modeled by wideband fading channels. We show that the problem can be formulated as a linear program, whose solution provides a joint cache allocation along with pre-fetching and fetching schemes that minimize the duration of the communication in the delivery phase. The suggested scheme uses zero-forcing and cached interference subtraction, and hence, allows each user to be served at the rate of its own channel. Thus, this scheme is better than the previously published schemes that are compromised by the poorest user in the communication group. We also consider a special case of the parameters for which we can derive a closed form solution and formulate the optimal power, rate, and cache optimization. This special case shows that the gain of MIMO coded caching goes beyond the throughput. In particular, it is shown that in this case, the cache is used to balance the users such that fairness and throughput are no longer contradicting. More specifically, in this case, strict fairness is achieved jointly with maximizing the network throughput.

Original languageEnglish (US)
Article number8374074
Pages (from-to)1682-1691
Number of pages10
JournalIEEE Journal on Selected Areas in Communications
Issue number8
StatePublished - Aug 2018

Bibliographical note

Publisher Copyright:
© 1983-2012 IEEE.


  • Cache-aided communication
  • MIMO
  • MIMO
  • cache and power allocation
  • finite SNR regime
  • linear optimization
  • zero-forcing


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