Hybrid Precoding Design in Millimeter Wave Single-user Large-scale Multiple-Input Multiple-Output System

In the millimeter wave Multiple Input Multiple Output (MIMO) system, in order to improve thespectral efficiency, an effective hybrid precoding double-layer alternating iterative algorithm is proposed. Thealternation of the outer layer uses the decomposition method to decouple the transmitter and receiver, whichreduces the number of solved variables in one calculation. The alternation of the inner layer is only used for thereceiver or transmitter. The analog domain matrix is decomposed by columns and the digital domain matrix isdecomposed by rows, which reduces the spectrum efficiency expression into a series of sub-problems.Considering the influence of single element in the analog domain matrix on the function and the limitation ofamplitude 1, the column elements are optimized one by one, and each solution is constrained to make solutionbe always in the convergence domain. Experimental results show that the proposed alternative optimization solution can obtain better performance and low complexity.