Estimation of correlated cochannel signals using the constant modulus array

The steady-state behavior of the cascade multistage constant modulus (CM) array is analyzed for correlated cochannel signals. It is demonstrated that the capture performance of the cascade system gradually deteriorates with increasing source cross-correlation. To overcome this loss, we consider using a parallel version of the multistage CM array that is appropriately initialized by a direction-finding algorithm. The proposed method of initialization is based on a single-stage CM array and a signal canceller adapted in tandem. Computer simulations are presented to illustrate the signal capture properties of the parallel multistage CM array.