Multi-precision codebook generating and adaptive beam training method based on sub-array cooperation

Abstract

The invention discloses a multi-precision codebook generating and adaptive beam training method based on sub-array cooperation, including a PS-DFT multi-precision codebook generating algorithm and anadaptive beam training algorithm. A multi-precision codebook has an analog / digital hybrid structure. The basic DFT sub-beams on sub-arrays are formed by an analog radio frequency component, and the cooperation between sub-arrays is realized by selecting basic sub-beams, adjusting the phase difference between sub-beams and carrying out power allocation through a digital baseband component. The adaptive beam training algorithm adaptively chooses a codebook layer number for initial beam training according to different transmission signal-to-noise ratios. The method of the invention has the advantages of low hardware implementation complexity, flat in-band beams and high angle estimation accuracy. The method is applicable to an occasion in which both sides of communication adopt a millimeter wave massive antenna point-to-point wireless communication system with a partially-connected hybrid pre-coding structure and the arrays used on the transmitter and receiver are uniform linear arrays with half-wave antenna spacing.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to a PS-DFT multi-precision codebook generation and adaptive beam training method based on subarray cooperation. Background technique [0002] Millimeter wave (mmWave) and sub-terahertz (sub-THz) in the 30-300G band have abundant spectrum resources, making Gbps high-speed wireless LAN and cellular network possible. However, compared with the existing mobile communication systems operating in the microwave band, mmWave and sub-THz wireless transmissions have serious transmission loss. While there is severe high-frequency transmission loss, the shorter wavelength makes it possible to integrate a greater number of antennas in the same size. Therefore, it is an effective solution to combat high-frequency transmission loss by erecting large-scale antenna arrays on both sides of the communication transceiver to obtain a large beamforming (Beamforming) gain. ...

AI Technical Summary

Problems solved by technology

However, when the radio-frequency chain (Radio-Frequency chain, RF chain) is limited, it is extremely difficult to pursue these technical indicators at the same time, especially in the hybrid (Precoding) mmWave system with a partial connection structure

This is because the phase adjustment results of different phase shifter groups in the partial connection structure cannot be added directly on the array, but can only be synthesized in the space angle domain, which leads to the coupling problem between sub-arrays

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