Fast estimation method for estimating direction of arrival (DOA) of higher-order cumulant

The invention discloses a fast estimation method for estimating the direction of arrival (DOA) of a higher-order cumulant and aims to discloses a fast estimation method for solving the problems of system estimated capacity and array estimated accuracy and estimating the DOA of related signals, wherein the higher the order, the better the estimation performance. According to the method, firstly, a 2q-order cumulant matrix is constructed, and the constructed 2q-order cumulant matrix is subjected to rotation transformation. After that, the cumulant matrix is averaged to obtain a spatially smoothed 2q-order cumulant matrix. Then the 2q-order cumulant matrix is subjected to eigenvalue decomposition to obtain a signal subspace and a noise subspace. Finally, an optimal solution is figured out based on a spectral function. The above improved and optimized DOA algorithm is independent of the concrete characteristics of signals, thus being applicable to the Gaussian white-noise environment and the Gaussian color-noise environment. The method can reduce the computation complexity, and greatly shorten the calculation time of the DOA in a 60 GHz wireless communication system. The method is applicable to the 60 GHz wireless communication system.