Extending MUSIC algorithm by using virtual array technique

In array signal processing, one is often interested in simultaneously estimating the directions and frequencies of uncorrelated narrow-band radiating sources having different center frequencies. In this paper we present a new high-resolution signal estimation algorithm which can estimate the spatial direction Bi and temporal frequency f(i) of each source by using the virtual time-and-space array technique with MUSIC algorithm. The virtual linear array consists of one spatial subarray and one virtual temporal subarray and the parameter pair (theta(i), f(i)) of each source can be easily obtained and automatically coupled. The proposed approach is simple and direct. Simulation results are presented to demonstrate the performance of the proposed technique.