Cochannel interference rejection using surface acoustic wave delay-difference devices

A method that uses a surface-acoustic-wave delay-difference device (SAW DDD) to effect signal suppression for the case of two uncorrelated signal components (one desired and one undesired) is described. This method consists of finding the SAW tap position where the average power is minimum. It is shown that when the desired and undesired signal strength are nearly equal performance can be improved by using the maximum and minimum average powers and their positions along the length of the SAW. By using multiple SAW DDD, a set of simultaneous equations is obtained that relates the incidence angles of more than two signals to power measurements along the SAWs. Extension of this method to the case of more than two cochannel signals is addressed