单用户毫米波大规模MIMO系统的混合预编码方案设计

Design of a hybrid precoding scheme for single-user milimeter wave massive MIMO systems

对MIMO通信系统的数字预编码方法进行了深入分析,指出单用户毫米波大规模MIMO系统和传统全数字预编码方案所用射频(RF)链路数量过大致使系统实现成本大和能量消耗较高,并针对这种情况,提出了一种在系统收发两端分别采用混合预编码器和混合合成器的混合预编码方案。该方案首先通过迭代算法设计模拟预编码矩阵,并且根据信道矩阵与模拟预编码矩阵作用生成的等效信道矩阵设计数字预编码矩阵,然后根据混合预编码器设计混合合成器,从而使系统频谱效率最大化。该方案与传统全数字预编码及现有混合预编码方案的仿真比较结果表明,该方案有效降低了系统实现成本和能量消耗,且性能优于现有的混合预编码方案,与传统全数字预编码方案相比,性能非常接近。

The digital precoding tactics for MIMO communication systems were deeply analyzed, and it was pointed that the traditional full digital precoding scheme for single-user millimeter wave massive MIMO systems can cause a sys- tem＇ s high cost and high power consumption because it needs a large number of radio frequency （RF） chains. To solve the problem, a hybrid precoding scheme hybrid precoder at the transmitter and using the hybrid combiner at the receiver was proposed. The proposed scheme uses the iterative algorithm to design the analog precoding matrix first, and designs the digital precoding matrix according to the equivalent channel matrix generated by the interac- tion of the channel matrix and the analog precoding matrix. Then, it designs the hybrid combiner according to the hybrid precoder to maximize the spectral efficiency. The simulation comparison of the proposed scheme with the tra- ditional full digital precoding scheme and the existing hybrid precoding scheme showed that the proposed scheme re- duced the system＇ s cost and energy consumption, furthermore, its performance outperformed the existing hybrid precoding scheme, and was very close to the traditional full digital precoding scheme.