A Sparse l-Matrix and Its Two-Dimensional DOA Estimation Method

Abstract

The invention discloses a sparse L matrix and a two-dimensional DOA estimation method thereof, belonging to the technical field of wireless mobile communication. The sparse L array of the present invention includes a first sub-array composed of a sparse uniform linear array whose element spacing is equal to the wavelength and an auxiliary array element, and a second sub-array composed of any sparse linear array whose minimum element spacing is less than or equal to half the wavelength. The common array element of the two linear arrays is the reference array element, and the distance from the auxiliary array element to the reference array element is half the wavelength. In two-dimensional DOA estimation, first calculate its autocorrelation matrix based on the received data of the second subarray, and estimate the corresponding second angle after performing eigendecomposition on it, and then calculate the signal source correlation matrix based on it; based on two subarrays The cross-correlation matrix of the received data and the signal source correlation matrix are used to obtain the matrix prevalence matrix of the first sub-array, thereby completing the estimation process of the first angle corresponding to the first sub-array, and obtaining a two-dimensional DOA. The present invention has low complexity and high accuracy of DOA estimation.

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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