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A Channel Estimation and Hybrid Beamforming Method Against Phase Shifter Imperfections

A technology of channel estimation and mixed beams, which is applied in channel estimation, baseband system components, electrical components, etc., can solve the problems of radio frequency chain not satisfying reciprocity, phase shifter imperfect performance, high computational complexity, etc., to reduce The effect of training overhead, avoiding unsatisfied channel reciprocity, and low computational complexity

Active Publication Date: 2021-08-13
UNIV OF SCI & TECH OF CHINA
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Problems solved by technology

However, these methods all have the disadvantages of high training overhead and high computational complexity. Therefore, most of them use channel reciprocity to complete complex channel estimation or beam training processes in the uplink, and then design downlink beamforming based on this.
But in fact, due to the existence of various factors such as in-phase and quadrature imbalance, the radio frequency chain does not satisfy reciprocity in the uplink and downlink. Therefore, if a downlink channel estimation method with low complexity and low training overhead can be used for downlink The design of hybrid beamforming, while solving the problem of performance degradation due to the imperfection of the phase shifter, is a promising research direction to solve this problem

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  • A Channel Estimation and Hybrid Beamforming Method Against Phase Shifter Imperfections
  • A Channel Estimation and Hybrid Beamforming Method Against Phase Shifter Imperfections
  • A Channel Estimation and Hybrid Beamforming Method Against Phase Shifter Imperfections

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Embodiment 1

[0026] This embodiment is applied to the millimeter wave communication channel estimation and hybrid beamforming method against the imperfection of the phase shifter, including the following process: the base station sends the training sequence to the user, and the discrete Fourier transform interpolation method is applied on the user side for downlink Angle of departure estimate. Then the base station designs analog domain precoding according to the feedback angle of departure. Using the designed precoding matrix in the analog domain, the base station sends the pilot to the user again, and the user estimates the equivalent channel. Finally, the base station designs zero-forcing digital domain precoding based on the equivalent channel information fed back by the user.

[0027] A specific embodiment of the channel estimation and hybrid beamforming method against the imperfection of the phase shifter applied to millimeter wave communication according to the present invention is...

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Abstract

The invention discloses a method for channel estimation and hybrid beamforming applied to millimeter wave communication against the imperfection of phase shifters. 2. Based on the downlink channel estimation information, the downlink hybrid precoding design is carried out to combat the imperfection of the phase shifter; 3. By making a compromise between performance and training overhead, the channel estimation is further improved Algorithm accuracy. For millimeter-wave hybrid beamforming, the present invention can solve the problem of precoding performance loss caused by the phase shift error and gain error of the phase shifter with very low training overhead and computational complexity, thereby greatly improving user reachability. data rate.

Description

technical field [0001] The invention belongs to the technical field of future 5G millimeter wave large-scale antenna array communication, and in particular relates to a method for channel estimation and hybrid beamforming against the imperfection of a phase shifter. Background technique [0002] Future 5G communications require greater bandwidth, higher data rates and spectral efficiency. The millimeter-wave frequency band has huge unlicensed spectrum resources and is considered to be a promising option for 5G communications; at the same time, large-scale antenna array technology can resist path loss by obtaining higher antenna gain; in addition, in order to save hardware costs and power Loss, hybrid beamforming technology has received extensive attention. Hybrid beamforming technology is divided into analog domain beamforming and digital domain beamforming. Analog domain beamforming is mostly implemented with a network of phase shifters. However, due to the limitation of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/02
CPCH04B7/0456H04B7/0617H04B7/086H04L25/0202
Inventor 王文帝尹华锐陈晓辉王卫东
Owner UNIV OF SCI & TECH OF CHINA
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