Blind identification algorithms for co-channel systems using higher-order statistics

In this work, we describe a method for the blind identification of co-channel systems. More specifically, two independent communication signals propagate through multipath channels, and their sum is picked up by the receiver. This type of a problem occurs in communication systems which employ frequency reusage. In some cases, there is no training signal available to aid the receiver for channel estimation, hence the multipath channel transfer functions have to be estimated blindly. The algorithm described in this work uses second- and fourth-order cumulants of the received signal. First, the magnitude responses of the channels are estimated, then using these, the phase responses are estimated