Hybrid precoding method based on analog phase shift-switch cascade network

Abstract

The invention relates to a hybrid precoding method based on an analog phase shift-switch cascade network, and the method comprises the following steps: giving an analog network structure in which a switch and a phase shifter are cascaded, and building a millimeter wave large-scale MIMO system hybrid precoding mathematical model based on the structure; solving an all-digital optimal precoding matrix through channel matrix singular value decomposition, and then randomly generating an analog phase shift precoding matrix; utilizing a block coordinate descent method to jointly optimize the analog switch precoding matrix and the digital precoding matrix; utilizing phase rotation to optimize an analog phase shift precoding matrix; and utilizing the analog phase shift precoding matrix, the analogswitch precoding matrix and the digital precoding matrix to complete hybrid precoding. Compared with the prior art, the analog phase shift-switch cascade network provided by the invention only needs phase shifters with the number equal to that of antenna array elements, and has the advantages of relatively low hardware cost, relatively low power consumption and the like; furthermore, a simulationexperiment result shows that the hybrid precoding method based on the analog phase shift-switch cascade network has relatively high spectral efficiency and energy efficiency.

Description

technical field [0001] The invention relates to a millimeter-wave massive MIMO system analog network structure, relates to a hybrid precoding method, and more specifically relates to a hybrid precoding method based on an analog phase shift-switch cascaded network, belonging to the technical field of wireless communication. Background technique [0002] With the rapid development of the modern information society and the rapid popularization of smart mobile terminals, the demand for mobile data transmission has shown exponential growth. In the current situation of increasing shortage of radio spectrum resources, how to achieve high-speed wireless data transmission and meet the needs of 5G networks in terms of user experience rate and throughput is a key issue in the field of mobile communications. Relevant studies have shown that the millimeter wave frequency band (30GHz-300GHz) has a large number of idle spectrum resources and can support data transmission rates above 10Gbps...

AI Technical Summary

Problems solved by technology

The separated phase-shifting network has the advantages of simple structure, low cost and low power consumption, but its spectral efficiency is far behind that of full digital precoding, and it is difficult to meet the needs of high-speed data transmission

[0004] Based on the above analysis, it can be seen that: (1) the hardware structure of the shared phase-shifting network is complex, and the cost and energy consumption are high, but using this structure for hybrid precoding can obtain higher spectral efficiency; (2) the separated phase-shifting network can be used in a certain Reduce hardware overhead to a certain extent, but using this structure for hybrid precoding will cause a large loss of spectral efficiency

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