Patent ID: 8081945

Claim:
A system for detecting antenna coupling and for providing feedback cancellation to reduce or eliminate antenna coupling, the system comprising: a signal receiver, configured to be coupled to a signal receiving antenna, for receiving signals; a signal amplifier, coupled to a signal feedback cancellation circuit and to said signal receiver, and responsive to said received signals and to a feedback cancellation signal, for amplifying said received signals; a signal transmitter, configured to be coupled to a signal transmitting antenna, for transmitting amplified signals from said signal amplifier; and the signal feedback cancellation circuit, configured to be coupled between said signal receiver and said signal transmitter, and responsive to said received signals and said amplified signals, for detecting signal coupling being between said receiving antenna and said transmitting antenna, wherein said signal feedback cancellation circuit includes a time domain feedback cancellation circuit, wherein said time domain feedback cancellation circuit further includes a white noise generator generating a white noise signal, said time domain feedback cancellation circuit coupled to said signal feedback cancellation circuit and configured for cross-correlating the white noise signal to the received signal, for developing the coefficients of the feedback cancellation circuit, and for causing said signal feedback cancellation circuit to adjust for antenna coupling between said signal receiver and said signal transmitter, and responsive to said coupling, for providing a feedback cancellation signal to said signal amplifier having a signal magnitude and strength for canceling said antenna signal coupling.