Millimeter wave digital-analog hybrid pre-encoding design method based on geometric construction

Abstract

The invention discloses a millimeter wave digital-analog hybrid pre-encoding design method based on geometric construction. The millimeter wave digital simulation hybrid pre-encoding design method is characterized by comprising the following steps: 1, calculating a pure digital pre-encoding matrix FD according to channel state information of a transmitting end antenna and a receiving end antenna; 2, performing matrix decomposition on the pure digital pre-encoding matrix FD to decompose the pure digital pre-encoding matrix FD into a product of an analog pre-encoding matrix FRF and a digital pre-encoding matrix RBB; 3, setting a coefficient fi(n) in the digital pre-encoding matrix RBB; 4, obtaining a nonlinear equation of an analog domain phase phi m, M+n of the i user: (the formula is as shown in the specification); and 5, solving the nonlinear equation to obtain an analog domain phase phi m, n, and then obtaining the analog pre-encoding matrix FRF. According to the method, the pre-encoding design problem is converted into a triangular construction problem of a complex plane from the geometric angle, thereby reducing the codeword search complexity (time complexity) of and computational complexity of the system, and effectively improving the spectrum efficiency of the system at the same time.

Description

A Design Method of Millimeter-Wave Digital-Analog Hybrid Precoding Based on Geometric Structure technical field The invention belongs to the technical field of wireless communication, and in particular relates to a geometric structure-based millimeter-wave digital-analog hybrid precoding design method. Background technique With the continuous development of wireless communication technology, the demand for high-speed data services and ubiquitous access is showing an explosive growth. The next generation of 5G mobile communication technology will have higher and higher demands on capacity, energy consumption and bandwidth. Studies have shown that the use of large-scale antenna arrays at the base station can bring various performance advantages such as system energy efficiency and spectrum utilization. However, in the traditional microwave frequency band, a large number of antennas will lead to a larger size of the antenna that meets the isolation, which brings certain diff...

AI Technical Summary

Problems solved by technology

In most of the existing hybrid precoding design methods, in order to obtain a suitable analog precoding vector, it is usually necessary to perform a greedy search on the codebook, and the size of the codebook usually increases exponentially with the number of system antennas and the number of phase quantization bits, so , large-scale search will inevitably lead to higher system complexity

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