Millimeter wave MIMO channel estimation method combining channel expression and beam design

Abstract

The invention relates to the field of a millimeter wave multiple-input multiple-output system channel estimation and discloses a low-complexity channel estimation method combining channel expression and beam design. The method comprises the following steps: 1) through NR and NT point DFT (discrete Fourier transform) linear expression of a response matrix of a receiver end antenna array and a guide matrix of a sending end antenna array, obtaining a FDFT, NR matrix and an inverse FDFT, NT matrix, wherein the NR and NT represent the number of antennas at a receiver end and a sending end respectively; 2) combining channel representation and pilot frequency beam design, and under the condition where a pilot pre-coding matrix of the sending end can be subjected to post-multiplication with the inverse FDFT, NT matrix to form a unit matrix and a conjugate transpose matrix of a pilot merging matrix of the receiver end can be subjected to pre-multiplication to form a unit matrix, executing the step 3); and 3) enabling the received pilot signal to be subjected to post-multiplication and pre-multiplication with the inverse FDFT, NT matrix and the FDFT, NR matrix respectively to estimate a channel matrix. The method has the advantage of low calculating complexity and overcomes the problem of not high estimated performance due to angular quantification error of an existing millimeter wave MIMO system compressed channel sensing method.

Description

technical field [0001] The present invention relates to the field of channel estimation for millimeter wave multiple-input multiple-output (MIMO) systems, and in particular, relates to a low-complexity channel estimation method for joint channel representation and pilot beam design. Background technique [0002] With the increase of radio services such as digital broadcasting and radio frequency identification, the demand for radio spectrum resources in various industries in society is increasing day by day, and the limited low-frequency spectrum resources are becoming increasingly scarce. ) has received extensive attention from researchers. The short wavelengths of mmWave bands allow massive antenna arrays to take up very little physical space. The base station and the user side can compensate the relatively high propagation loss in the millimeter wave frequency band through the beam gain provided by the large-scale antenna array. Therefore, millimeter-wave MIMO combined ...

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Problems solved by technology

[0006] The purpose of the present invention is to provide a low-complexity millimeter-wave MIMO system channel estimation method, which overcomes the low estimation performance caused by the angle quantization error of the existing millimeter-wave MIMO system compressed channel sensing method, and the need for matrix Kronecker product operations and matrix inversion operation lead to the problem that the algorithm complexity is too high

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