Bridging the gap between multiplexing and diversity in finite SNR multiple antenna coded caching

Lampiris, Eleftherios; Elia, Petros; Caire, Giuseppe
ASILOMAR 2019, Asilomar Conference on Signals, Systems, and Computers, 3-6 November 2019, Pacific Grove, CA, USA

We study the multi-antenna Coded Caching setting in the finite Signal-to-Noise-Ratio (SNR) region, with the purpose to utilize the extra resources from the multiple antennas to increase the rate performance of the system. Specifically, assuming an L-antenna setting with K cache-enabled users (each with normalized cache-size), previous works showed that at the high SNR region the performance is proportional to L+K  degreesof-freedom while, if one considers the low SNR region this would be outperformed by a strategy that focuses on beamforming a (single) multicast message (of K +1 elements) to its recipients.
In order to bridge these two extremes we use a recently proposed algorithm that can balance the amount of users served in order to maximize the achieved sum-rate.

Pacific Grove
Systèmes de Communication
Eurecom Ref:
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