A least squares projective constant modulus approach

We present an iterative constant modulus algorithm using the least squares method with projection to blindly separate and estimate multiple co-channel frequency modulated (FM) signals in an antenna array system. The constant modulus property of FM signals is exploited to simultaneously determine the spatial signature and the waveform for each signal. Furthermore, the spatial response of the array and the propagation environment do not need to be known prior to using this algorithm, making it particularly useful in mobile communications. Computer simulations are presented to verify its promising performance