Coded Caching with Linear Subpacketization is Possible in Multi-Antenna Communications
MohammadJavad Salehi, Antti Tölli, Seyed Pooya Shariatpanahi · arXiv (Cornell University) · 2019
Exponentially growing subpacketization is known to be a major issue for practical implementation of coded caching, specially in networks with multi-antenna communication setups. We provide a new coded caching scheme for such networks, which requires linear subpacketization and is applicable to any set of network parameters, as long as the multi-antenna gain $L$ is larger than or equal to the global caching gain $t$. Our scheme includes carefully designed cache placement and delivery algorithms; which are based on circular shift of two generator arrays in perpendicular directions. It also achieves the maximum possible degrees of freedom of $t+L$, during any single transmission.