A DoA Estimation Method Based on DFT Enhancement in Large-Scale Arrays

Abstract

A DOA estimation method based on DFT enhancement in a large-scale array, through the combination of DFT and Taylor expansion algorithm to obtain an accurate estimation of DOA: First, for the spatial signal received by a large-scale antenna array, use DFT to obtain the initial signal of the signal DOA estimation; then, on the basis of obtaining the initial angle, the first-order Taylor series expansion of the array direction matrix is ​​performed at the initial angle, and then the difference between the real signal angle and the initial angle is obtained by the overall least square method; finally, the initial The difference is added to the angle to obtain an accurate DOA estimated angle. The invention skillfully combines DFT transformation, Taylor series expansion and the characteristics of large-scale antenna arrays, breaks through the technical bottleneck that traditional subspace algorithms require huge complexity when applied to large-scale antenna arrays and is not easy to apply in practice, and can be faster and faster. The target signal angle can be accurately estimated, the operation cost is low, the effect is good, and it is easy to implement in engineering.

Description

technical field [0001] The invention belongs to the technical field of large-scale antenna direction finding, and in particular relates to a DOA estimation method based on DFT enhancement in a large-scale array. Background technique [0002] Massive multi-input multi-output (Massive MIMO) technology will be an important physical layer technology of the fifth generation wireless communication system (Fifth Generation, 5G). In the Massive MIMO wireless communication system, the base station will use a large-scale array composed of hundreds of antennas. [0003] When using large-scale antenna arrays for Direction of arrival (DOA) estimation, conventional subspace-based DOA estimation algorithms, such as multiple signal classification (Multiple signal classification, MUSIC), use rotation-invariant parameter estimation (Estimation of signal parameter viarotational invariance, ESPRIT), which is limited because of its high computational complexity. First of all, the application o...

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Problems solved by technology

Unlike the traditional DFT method that uses phase search to obtain accurate DOA estimation angles, the method of the present invention uses a combination of DFT and Taylor expansion to solve the problem of high complexity in DOA estimation algorithms for large-scale antenna arrays

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