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Multi-antenna Interference Management for Coded Caching. (arXiv:1711.03364v1 [cs.IT])
来源于:arXiv
A single cell downlink scenario is considered where a multiple-antenna base
station delivers contents to multiple cache-enabled user terminals. Using the
ideas from multi-server coded caching (CC) scheme developed for wired networks,
a joint design of CC and general multicast beamforming is proposed to benefit
from spatial multiplexing gain, improved interference management and the global
CC gain, simultaneously. Utilizing the multiantenna multicasting opportunities
provided by the CC technique, the proposed method is shown to perform well over
the entire SNR region, including the low SNR regime, unlike the existing
schemes based on zero forcing (ZF). Instead of nulling the interference at
users not requiring a specific coded message, general multicast beamforming
strategies are employed, optimally balancing the detrimental impact of both
noise and inter-stream interference from coded messages transmitted in
parallel. The proposed scheme is shown to provide the same degrees-of-freedom 查看全文>>