Adaptive cancellation of multi-path interferences

A multi-path signal interference cancellation system for connection to a radio receiver system having a receive antenna, a receiver and a receiver transmission line electrically coupling the receive antenna to the receiver, the receive antenna receiving multiple time delayed signal components of an interference signal following multiple paths to the receive antenna, which comprises:

• a reference antenna, the reference antenna receiving the interference signal and providing a reference signal corresponding thereto;
• a coupler, the coupler being electrically coupled to the receiver transmission line and providing an error sample signal;
• a storage circuit for storing an intensity profile of the multi-path interference signal and generating an intensity profile signal in response thereto;
• a plurality of adaptive interference canceller circuits, each adaptive interference canceller circuit having a synchronous detector, a signal controller and at least one integrator, the synchronous detector of each adaptive interference canceller circuit receiving at least a portion of the reference signal and at least a portion of the error sample signal and generating at least one detector output signal in response thereto, the at least one integrator of each adaptive interference canceller circuit having gain and bandwidth characteristics associated therewith and being responsive to the at least one detector signal and the intensity profile signal and generating an integrator output signal adjusted in at least one of gain and bandwidth in response to the at least one detector signal and the intensity profile signal, the signal controller of each adaptive interference canceller circuit receiving at least a portion of the reference signal and the integrator output signal and generating in response thereto a cancellation signal;
• a subtractor, the subtractor being electrically coupled to the receiver transmission line and effectively injecting the cancellation signal generated by each signal controller of each adaptive interference canceller circuit onto the receiver transmission line, the cancellation signals effectively injected onto the receiver transmission line being substantially equal in amplitude and substantially opposite in phase to the multiple time delayed components of the multi-path interference signal received by the receive antenna so as to minimize or cancel the multiple time delayed components of the multi-path interference signal.