Abstract
Based on the millimetre-wave time-domain channel detector, this paper conducts channel measurement and modelling for different scenarios and antenna types in typical frequency bands and thus carries out a study on the propagation characteristics of millimetre-wave channels in typical frequency bands and scenarios for 5G. The time-varying characteristics and modelling methods of millimetre-wave clusters are studied, and the time-varying channel simulation strategy and linear regression fitting method are used to establish the time-varying generation and extinction model of clusters by combining the measured data of 26 GHz large-scale antenna channels. The algorithm is based on the correlation dictionary and achieves the efficient and optimal selection of large-scale antenna arrays in the millimetre-wave band. A low-complexity multiuser hybrid precoding design scheme is proposed based on the wideband millimetre-wave large-scale Multiple-Input Multiple-Output (MIMO) system. The scheme aims to maximize the system spectral efficiency and introduces the net spectral efficiency as a bridge to decouple the analogy precoding design from the digital precoding design, thus significantly reducing the computational complexity. In the analogy precoding stage, a Hungarian algorithm-based beam assignment method is proposed to avoid beam conflicts and maximize the net spectral efficiency of the system; in the digital precoding stage, the equivalent channel matrix of each subcarrier is diagonalized to eliminate multiuser interference. Finally, the effectiveness of the scheme is verified by simulation. In this paper, we focus on the radio frequency (RF) link and user selection algorithm of 5G mobile communication system. Through the study of these two aspects, the RF link of our communication system has high stability and reliability, and through the study of the algorithm used for selection, our results also have a strong practical value.
Highlights
As the global mobile communication technology continues to develop rapidly, new applications and new demands such as ultra-high-definition video services, mobile cloud computing, and high-quality data services are emerging, and mobile communication technology is facing higher and higher challenges
A low-complexity multiuser hybrid precoding design scheme is proposed based on a wideband millimetrewave large-scale Multiple-Input Multiple-Output (MIMO) system. e scheme adopts the hierarchical design idea to maximize the system spectral efficiency as the design goal and introduces the net spectral efficiency as a bridge to decouple the analogy precoding design from the digital precoding design
In the analogy precoding stage, a beam assignment method based on the Hungarian algorithm is proposed to avoid beam conflicts and maximize the net spectral efficiency of the system; in the digital precoding stage, the equivalent channel matrix of each subcarrier is diagonalized to eliminate multiuser interference
Summary
As the global mobile communication technology continues to develop rapidly, new applications and new demands such as ultra-high-definition video services, mobile cloud computing, and high-quality data services are emerging, and mobile communication technology is facing higher and higher challenges. Four typical application scenarios of 5G are continuous wide area coverage, low power consumption and large links, low latency, high reliability, and high capacity hotspots. Erefore, millimetre waves have a large path loss when propagating in free space, and because of the use of the high-frequency band for communication, the transmission distance will be shortened and the coverage capability will be greatly reduced, which requires more base stations to maintain the transmission capability.
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