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Treating Content Delivery in Multi-Antenna Coded Caching as General Message Sets Transmission: A DoF Region Perspective. (arXiv:1807.01432v1 [cs.IT])
来源于:arXiv
Coded caching can create coded multicasting thus significantly accelerates
content delivery in broadcast channels with receiver caches. While the original
delivery scheme in coded caching multicasts each coded message sequentially, it
is not optimal for multiple-input multiple-output (MIMO) broadcast channels.
This work aims to investigate the full spatial multiplexing gain in
multi-antenna coded caching by transmitting all coded messages concurrently. In
specific, we propose to treat the content delivery as the transmission problem
with general message sets where all possible messages are present, each with
different length and intended for different user set. We first obtain inner and
outer bounds of the degrees of freedom (DoF) region of a $K$-user $(M,N)$
broadcast channel with general message sets, with $M$ and $N$ being the number
of transmit and receive antennas, respectively. Then for any given set of coded
messages, we find its minimum normalized delivery time (NDT) by searchi 查看全文>>