DOA estimation algorithm of MIMO system

In this paper, we propose a method of direction of arrival (DOA) estimation which is called complex spatial specturm method (CSM). Advantages and disadvantages of the multiple signal classification (MUSIC) algorithm and the Reciprocal Weighted of Signal subspace principal eigenvalue Projection (RWSP) algorithm are discussed in the paper. By combing the advantages of two algorithms, the information of signal subspace and noise subspace are used in CSM. The feasibility of CSM which uses spatial spectrum estimation is proved theoretically. Simulation results indicate that the CSM is a high resolution and robustness algorithm for resolving multiple incoherent and coherent signals that are incident on an array of antenna.