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TLS-ESPRTT algorithm-based 2D DOA estimation in large scale MIMO system

A 2DDOA, large-scale technology, applied in radio wave direction/deviation determination systems, directional multi-channel systems using radio waves, direction finders using radio waves, etc., can solve problems such as low computational complexity

Active Publication Date: 2015-06-03
CHONGQING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0005] Aiming at the shortcomings of the current 2D DOA estimation method, the present invention proposes a 2D DOA estimation method based on the TLS-ESPRIT algorithm in a large-scale MIMO system, and effectively solves the two-dimensional DOA estimation problem in a large-scale MIMO system by using the idea of ​​the TLS-ESPRIT algorithm , not only can automatically realize the pairing of azimuth angle and elevation angle, but also the computational complexity is relatively low

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[0045] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with the accompanying drawings:

[0046] figure 1 Shown is the flow diagram of the 2D DOA method in the massive MIMO system proposed by the present invention. The base station is configured with M×N-dimensional URA, where M represents the number of URA horizontal-dimensional antennas, and N represents the number of URA vertical-dimensional antennas, ensuring that each transmission The antennas can process information in both the horizontal and vertical dimensions at the same time, and the user end sends K signals. According to the received signal model of the massive MIMO system, the area array is first divided into two partially overlapping sub-arrays, and the signal subspace of the sub-array is calculated by the 1D ESPRIT algorithm; then the TLS criterion is used to estimate the elevation angle...

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Abstract

The invention discloses a method for estimating a 2D DOA (2-Dimensional Direction of Arrival) by utilizing a TLE ESPRIT (Total Least Square-Estimating Signal Parameter via Rotational in Variance Techniques) algorithm in a large scale MIMO system. The method comprises the following steps: dividing an area array into two partially-overlapped sub-arrays according to a received signal model of the large scale MIMO system, so that the two partially-overlapped sub-arrays meet the requirement for the array shift invariance of the ESPRIT algorithm; calculating a signal subspace of each sub-array according to a 1D ESPRIT (1-Dimensional ESPRIT) algorithm, and estimating elevation information according to a TLS rule; estimating an azimuth by utilizing a direction matrix of one of the sub-arrays, and automatically matching the azimuth with the elevation. According to the method, the problem about 2-dimensional DOA estimation in the large scale MIMO system is effectively solved by adopting the thought of the TLS-ESPRIT algorithm; the azimuth can be matched with the elevation automatically; the computing complexity is relatively low.

Description

Technical field [0001] The invention mainly relates to the technical field of future mobile communication. Background technique [0002] In the future, mobile data traffic will increase exponentially, and traditional MIMO technology cannot meet this demand. At the end of 2010, Bell Labs scientist Thomas L. Marzetta proposed the concept of Massive MIMO (Large Scale MIMO), also called Massive MIMO. As a key technology of future wireless communication systems, massive MIMO is equipped with a huge number of antennas at the base station, in order to deepen the use of unlimited resources in spatial dimensions, and improve the system's spectrum efficiency and power. Massive MIMO systems usually use area arrays, cylindrical arrays or special-shaped arrays at the base station. In a massive MIMO system, due to the multi-antenna configuration of the base station, it is very difficult for the base station to obtain Channel State Information (CSI). The traditional base station precoding com...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S3/74
CPCG01S3/14
Inventor 景小荣李宁张祖凡陈前斌
Owner CHONGQING UNIV OF POSTS & TELECOMM
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