Root value MUSIC-based mixed angle of arrival estimation in large-scale MIMO

Abstract

The invention provides a root value MUSIC-based mixed structure-based angle of arrival estimation method in a large-scale MIMO system. According to the method, analog beamforming and digital beamforming are combined, analog beamforming design is performed by using a phase shift network, a digital beamforming vector is designed by using a root value MUSIC algorithm, so that an angle of arrival of an arrival wave signal is estimated by using a direction ensuring highest receiving power. As the antenna array grows largely, in digital beamformign, each antenna needs a dedicated radio frequency (RF) link, while, mixed beamforming can remarkably reduce RF links so as to remarkably lower hardware cost. Compared with analog beamforming, mixed beamforming may improve the performance remarkably dueto introduction of digital beamforming. The mixed beamforming algorithm considers both the large-scale MIMO system performance and hardware cost, estimates the angle of arrival of the arrival wave signal effectively, and makes angle estimation less complex.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to a method for estimating an angle of arrival under a mixed structure based on a root value MUSIC in a massive MIMO system. Background technique [0002] Due to their high spectral efficiency and spatial spectrum estimation accuracy, massive MIMO systems have attracted extensive attention from academia and industry. At the same time, due to the wide range of applications of the angle of arrival, including the Internet of Things, directional modulation, UAV networks, intelligent transportation, wireless sensor networks and other fields, massive MIMO can provide high spatial spectrum estimation accuracy, making the angle of arrival The application of massive MIMO in the estimation can greatly improve the positioning accuracy and ensure the accuracy of positioning. [0003] The problem of wireless positioning has a long history, which can be traced back to the beginning of wirel...

AI Technical Summary

Problems solved by technology

When the antenna array tends to be developed on a large scale, the cost of hardware will increase dramatically

At the same time, considering the high-dimensional reception data of large-scale antenna arrays, the traditional digital beamforming method has high computational complexity, and it is difficult to meet the high real-time requirements of practical applications.

Analog beamforming, on the other hand, can use only one RF chain to process the received signal, but its performance is often difficult to compare with digital beamforming

Images