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

Cache Aided Communications with Multiple Antennas at Finite SNR