A blind adaptive antenna system for the estimation of mutually correlated cochannel sources

The constant modulus (CM) array is an adaptive beamformer that blindly recovers a cochannel source without requiring array calibration. An adaptive signal canceller removes the captured source from the array input, after which the remaining cochannel signals can be processed by a series of similar CM array stages. This multistage cascade CM array may experience a loss in performance when the sources are correlated. In this paper, we propose a modified system based on a parallel architecture. The cascade CM array is employed to appropriately initialize the parallel stages, which in turn recover the cochannel sources. Computer simulations are presented to illustrate the transient and steady-state behaviour of the proposed system.