基于大规模MIMO的共享型阵列混合波束成形算法

Fully-connected array hybrid beamforming based on massive MIMO

针对大规模MIMO系统中传统全数字波束成形算法的系统实现成本高昂和能量消耗巨大等问题,提出了一种共享型阵列的混合波束成形算法。在设计算法时为了充分利用大规模天线阵列所带来的增益,考虑分别提取全数字波束成形算法中最佳预编码矩阵和合成矩阵的相位信息作为混合波束成形算法中的模拟预编码矩阵和模拟合成矩阵,然后对它们与信道作用后的等效信道进行奇异值分解,得到相应的数字预编码矩阵和数字合成矩阵。仿真结果表明,本文所提混合波束成形算法能够在系统性能和实现成本之间达到较好的折衷,同时该算法对硬件精度的要求较低。

In view of the huge cost and the huge energy consumption of the traditional fully-digital beamforming algorithm in massive MIMO system,a hybrid beamforming algorithm based on fully-connected arrays is proposed.In order to exploit the gain from a large array of antennas adequately,the analog precoding matrix and analog combining matrix of the hybrid beamforming algorithm are extracted from the optimal precoding matrix and combining matrix algorithm.Then the singular value decomposition of the equivalent channel which is generated by analog precoding(combining)matrix and channel matrix is performed,to obtained the corresponding digital precoding(combining)matrix.The simulation results show that the proposed hybrid beamforming algorithm can achieve a good trade-off between system performance and implementation cost,as well as,the proposed algorithm has low requirement for hardware precision.