Subpacketization-Beamformer Interaction in Multi-Antenna Coded Caching
MohammadJavad Salehi, Antti T\"olli, Seyed Pooya Shariatpanahi

TL;DR
This paper investigates how the interaction between beamformer complexity and subpacketization affects the achievable rate in multi-antenna cache-enabled communications at low-SNR, revealing that joint increases can improve performance.
Contribution
It provides a mathematical analysis showing the contrasting effects of subpacketization on simple versus complex beamformer structures at low-SNR.
Findings
Simplistic beamformers see degraded rates with increased subpacketization.
Complex beamformers benefit from increased subpacketization for better rates.
Jointly increasing beamformer complexity and subpacketization improves low-SNR performance.
Abstract
We study the joint effect of beamformer structure and subpacketization value on the achievable rate of cache-enabled multi-antenna communications at low-SNR. A mathematical approach with low-SNR approximations is used, to show that using simplistic beamformer structures, increasing subpacketization degrades the achievable rate; in contrast to what has been shown in the literature for more complex, optimized beamformer structures. The results suggest that for improving the low-SNR rate, subpacketization and beamformer complexity should be jointly increased.
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