Conjugate unitary ESPRIT for real sources adapted to the coherent case

By virtue of real-valued property of some real sources, in this paper, we suggest a conjugate unitary ESPRIT (CU-ESPRIT) algorithm to exploit the conjugate information of partial array element outputs. To deal with correlated or coherent sources, we design a virtual centro-symmetric array and divide it into the virtual subarrays. Compared with the unitary ESPRIT for non-circular sources (NC unitary ESPRIT), CU-ESPRIT achieves a relative reduction of the computational complexity and an improved resolution for uncorrelated or coherent sources. Specifically, this algorithm can estimate as many as M-1M-1 coherent sources for an array of MM elements. Simulation results show the validity of our approach.