Azimuth/elevation estimation for cyclostationary coherent sources using higher order cyclic cumulant

Cyclic higher order statistics (CHOS) have powerful signal detection capability and show potential in most mobile communication systems. In this paper, we propose a CMOS-based algorithm to estimate azimuth/elevation using a selected high-resolution planar array to detect nonGaussian coherent cyclostationary sources by designing a fourth-order cyclic cumulant matrix and using eigen vector (EV) approach. For coherent sources caused by multipath propagation, a special forward/backward averaging method is utilized in two-dimension (2-D) case to resolve directions. Simulation results show that, in multipath situation, our algorithm has advantages of suppressing additive stationary noise and Gaussian noise with unknown spatial characteristics, as well as its signal selectivity to remove interferences with different cycle frequencies from the signals of interests (SOI´s). Also, array aperture is extended by exploiting a special array geometry.