多用户毫米波MIMO系统中基于信道互易性的混合模数预编码算法

本文针对多用户毫米波多输入多输出(Multiple Input Multiple Output，MIMO)系统，首次提出了分离子阵列MIMO混合模数预编码架构毫米波系统的一种模拟接收方案。将最大化和速率求解混合模数预编码的三元联合优化问题分成模拟和数字两部分求解，进一步提出了基于信道互易性的混合模数预编码算法。该算法通过最大化下行各个用户和上行各个子阵列的接收信干噪比分别求解模拟合并矢量和模拟预编码矢量；优化模拟部分后，设计发射端数字预编码器消除多用户数据流之间的干扰。数值仿真表明所提算法收敛速度快，且可获得接近最优纯数字预编码算法的性能。 

Hybrid Analog and Digital Precoding Algorithm Based on Channel Reciprocity for Multi user Millimeter Wave MIMO Systems

This paper aims at multiuser millimeter wave (mmWave) MIMO system, first proposes an analog receive scheme for mmWave system with split subarray MIMO hybrid analog and digital precoding architecture. Designing hybrid analog and digital precoders with the target of maximize the sum rate is a triple joint optimization problem, which can be divided into analog part and digital part. Based on the channel reciprocity, this paper further proposes a hybrid analog and digital precoding algorithm. The algorithm obtains analog combining vectors by maximizing the reception SINR of each downlink user, and achieves analog precoding vectors by maximizing the reception SINR of each uplink antenna arrays. After the analog part is optimized, transmitter’s digital precoder is designed to eliminate the interference between multiple users’ data streams. Numerical results show that the proposed algorithm convergences fast, and can achieve performance near the optimal purely digital precoding algorithm.