  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.
