Sparse L-shaped array and two-dimensional DOA estimation method thereof

Abstract

The invention discloses a sparse L-shaped array and a two-dimensional DOA estimation method thereof and belongs to the technical field of wireless mobile communication. The sparse L-shaped array comprises a first subarray formed by a sparse uniform linear array, the array element space of which is equal to the wavelength, and an auxiliary array element, and a second subarray formed by an arbitrary sparse linear array, the minimum array element space of which is smaller than or equal to a half wavelength. The shared array element of the two linear arrays is a reference array element, and the distance between the auxiliary array element and the reference array element is the half wavelength. The two-dimensional DOA estimation method is characterized by, to begin with, calculating an autocorrelation matrix according to received data of the second subarray, carrying out characteristic decomposition on the autocorrelation matrix and then, estimating a corresponding second angle, and carrying out calculation to obtain an information source autocorrelation matrix based on the second angle; and obtaining an array manifold matrix of the first subarray according to a cross-correlation matrix of the received data of the two subarrays and the information source autocorrelation matrix, thereby finishing estimation of a first angle corresponding to the first subarray, and obtaining the two-dimensional DOA. Complexity is low, and DOA estimation precision is high.

Description

technical field [0001] The invention belongs to the technical field of wireless mobile communication, in particular to an L array based on a linear array structure and a two-dimensional direction of arrival (DOA) estimation method thereof. Background technique [0002] With the rapid development of wireless communication technology in recent years, people's demand for communication traffic and communication quality is also increasing. The space division multiple access technology with array signal processing technology as the core has become the key to the next generation of mobile communication. [0003] Most of the existing two-dimensional DOA estimates are based on a simplified planar array whose element spacing is equal to half the wavelength. Among them, the L-array has been widely concerned and applied due to its advantages such as larger effective aperture, smaller calculation load, easier implementation, and stronger method applicability. In recent decades, people h...

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Problems solved by technology

[0004] The purpose of the invention of the present invention is: in order to overcome existing sparse L array and traditional L array in estimation algorithm complexity, the deficiencies in estimation accuracy, propose a kind of sparse L array with simple structure and corresponding two-dimensional angle of arrival ( DOA) estimation algorithm to achieve the purpose of reducing computational complexity, system cost, simplifying processing procedures, and effectively improving estimation accuracy.

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