A Low-Subpacketization High-Performance MIMO Coded Caching Scheme
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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 multiple-input 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.
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