毫米波MIMO系统中部分连接型混合预编码设计

Partially Connected Hybrid Precoding Design for MillimeterWave MIMO System

为了提高毫米波通信系统中混合预编码频谱效率,考虑交替使用最小化架构来提高波束形成增益。然而,这种架构因为射频域调相网络通常使用移相器构成,导致非凸约束,并且已知解决方案具有更高的计算复杂度。在使用交替最小化架构之前,证明了信道矩阵的有序右奇异向量的相位角可以用来初始化模拟预编码器,从而避免了采用搜索近似最佳模拟预编码矩阵的复杂优化过程。另外,不需要发射机处的天线阵列响应矢量。仿真结果表明,提出的算法性能优于传统部分连接型算法且复杂度更低,尤其在高信噪比情况下,更加明显。

In order to improve the efficiency of the hybrid precoding spectrum in millimeter wave systems,it is considered the alternative minimization scheme to improve the beam forming gain.However,this architecture is non-convex constrained due to the fact that radio frequency domain phase modulating networks are usually constructed using phase shifters,and the solution is known to have higher computational complexity.Before using the alternating minimization architecture,it is proved that the phase angle of the ordered right singular vector of the channel matrix can be used to initialize the analog precoder,thus avoiding the complex optimization process of searching the approximate optimal analog precoder matrix.In addition,the antenna array response vectors at the transmitter are not required.The simulation results show that the proposed algorithm has better performance and lower complexity than the traditional partially connected algorithm,especially in the case of high signal-to-noise ratio.