A Low-Subpacketization High-Performance MIMO Coded Caching Scheme

In this paper, we study how coded caching can be efficiently applied to multiple-input multiple-output (MIMO) communications. This is an extension to cache-aided multipleinput single-output (MISO) communications, where it is shown that with an L-antenna transmitter and coded caching gain t, a cumulative coded caching and spatial multiplexing gain of t + L is achievable. We show that, interestingly, for MIMO setups with G-antenna receivers, a coded caching gain larger than MISO setups by a multiplicative factor of G is possible, and the full coded caching and spatial multiplexing gain of Gt + L is also achievable. Furthermore, we propose a novel algorithm for building low-subpacketization, high-performance MIMO coded caching schemes using a large class of existing MISO schemes.