毫米波大规模多输入多输出系统由于混合预编码可以大大减少射频链路的使用, 解决全数字预编码造成的硬件损耗, 而且性能接近全数字预编码而成为目前研究的热点。文章提出利用自适应连接网络, 在模拟域和数字域均采用迫零算法, 从而进一步降低硬件成本。在瑞利衰落信道和稀疏散射毫米波信道分别对提出的算法进行了仿真,仿真结果表明, 该算法能够在自适应连接网络结构中实现更好的性能, 比同结构自适应算法具有更高的频谱效率, 性能更加逼近全数字预编码。

In a millimeter wave massive Multiple-Input Multiple-Output (MIMO) system, hybrid precoding has become a hot research topic because it can greatly reduce the use of radio frequency links, and solve the hardware loss caused by full digital precoding. In addition, the performance is close to full digital precoding. This paper proposes to use an adaptive connection network, using Zero-Forcing (ZF) algorithm in both analog and digital domains, which can further reduce the hardware costs. The proposed algorithm is simulated on the Rayleigh fading channel and the sparsely scattered millimeter wave channel. The simulation results show that the proposed algorithm can achieve better performance in the adaptive connection network structure, and has higher spectral efficiency than the same structure adaptive algorithm. It also shows that the performance is closer to full digital precoding.