This paper studies multi-antenna processing based cache-aided relaying networks for B5G communications, where the techniques of multi-antenna processing and wireless caching are investigated by studying the impact on the network performance. As to the multi-antenna processing scheme, both the selection combining (SC) and the maximal-ratio transmission/maximal-ratio combining (MRT/MRC) technique are considered. Compared with the SC technique, the MRT/MRC can exploit the benefits of all antennas at the cost of increasing implementation complexity. For the multi-antenna processing based cache-aided relaying networks, we analyze the network transmission performance by deriving the analytical as well as the asymptotic expressions for the outage probability, from which we obtain some important guidance on the network design. Simulation results are finally demonstrated to validate the merits of the multi-antenna signal processing and wireless cache. In particular, the MRT outperforms the SC scheme at the cost of more implementation complexity.

本文研究了用于B5G通信的基于多天线处理的缓存辅助中继网络，其中通过研究对网络性能的影响，研究了多天线处理和无线缓存技术。对于多天线处理方案，既考虑了选择组合（SC），又考虑了最大比例传输/最大比例组合（MRT / MRC）技术。与SC技术相比，MRT / MRC可以利用所有天线的优势，但代价是实现的复杂性会增加。对于基于多天线处理的缓存辅助中继网络，我们通过推导中断概率的解析式和渐近式来分析网络传输性能，从而为网络设计提供一些重要指导。最后证明了仿真结果，以验证多天线信号处理和无线缓存的优点。特别是，MRT的性能优于SC方案，但实现起来却更加复杂。