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Grid compensation large-scale MIMO channel estimation method

A channel estimation, large-scale technology, applied in channel estimation, radio transmission systems, electrical components, etc., can solve the problem of estimation accuracy dependence and high computational complexity, and achieve the effect of solving grid mismatch and better performance

Active Publication Date: 2019-12-31
HARBIN ENG UNIV
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Problems solved by technology

[0004] The purpose of the present invention is to provide a grid-compensated large-scale MIMO channel estimation method for the problem that the estimation accuracy of the MUSIC method is too dependent on the degree of grid refinement, resulting in high computational complexity.

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  • Grid compensation large-scale MIMO channel estimation method

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Embodiment Construction

[0043] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0044] Aiming at the problem that the estimation accuracy of the MUSIC method depends too much on the degree of grid refinement, resulting in high computational complexity, the present invention proposes a grid-compensated channel estimation method based on second-order Taylor expansion. First, the two-dimensional MUSIC method is used to obtain The angle value on the grid point, and then use the orthogonality of the signal subspace and the noise subspace to construct the joint objective function related to the emission angle and the reception angle, carry out the second-order Taylor expansion of the steering vector, and use the gradient descent method to obtain Take the closed-form solution of the grid deviation of the launch angle and reception angle, and update iteratively. Finally, the least square method is used to obtain the fadi...

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Abstract

The invention provides a grid compensation large-scale MIMO channel estimation method. The method comprises: firstly, using a two-dimensional MUSIC method for solving a transmitting angle and a receiving angle on a grid point; secondly, solving an optimal value of grid deviation by utilizing orthogonality of a signal subspace and a noise subspace; and finally, reconstructing a channel matrix by utilizing the least square estimation fading coefficient, and completing channel estimation. The method has the advantages of high estimation precision, stability and the like of the MUSIC method; estimation precision is guaranteed by combining second-order Taylor expansion; and simulation data show that the estimation precision of the compensation method based on second-order Taylor expansion is obviously higher than that of the compensation method based on first-order Taylor expansion, and compared with other methods for solving the off-grid problem, the compensation method based on second-order Taylor expansion has obvious performance advantages especially at a low signal-to-noise ratio.

Description

technical field [0001] The invention relates to a channel estimation method, in particular to a grid compensation large-scale MIMO channel estimation method, which belongs to the field of array signal processing. Background technique [0002] Millimeter-wave massive MIMO is considered to be an important technology for next-generation wireless communication, and it has become a research hotspot since it was proposed due to its advantages. Due to the adoption of the millimeter-wave band, path fading has become one of the main limitations of massive MIMO systems. In order to improve the above defects, the integrated gain of large-scale antenna structures is generally used to reduce the impact of fading. Compared with the traditional MIMO system, it has higher data transmission rate and spectrum utilization. Traditional all-digital precoding requires each antenna to be equipped with an expensive radio frequency chain and a high-power analog-to-digital converter. However, it wil...

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Application Information

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IPC IPC(8): H04L25/02H04B7/0413
CPCH04L25/0202H04B7/0413
Inventor 王伟岳佳男黄平邬佳
Owner HARBIN ENG UNIV