Patent ID: 8010042
Filing Date: 2011-08-30
Classification: G01S,H01Q,H04B

Abstract:
1. A repeater comprising: at least one antenna element for communicating in one direction and at least one antenna element for communicating in another direction; a radio frequency uplink path and a radio frequency downlink path coupled between the antenna elements; and an adaptive cancellation circuit in at least one of the radio frequency uplink path and the radio frequency downlink path, the adaptive cancellation circuit configured to generate a cancellation signal without requiring an injected signal; a summing junction, the summing junction configured to receive and sum the cancellation signal and an incoming radio frequency signal from at least one of the uplink path and the downlink path; wherein the cancellation signal substantially reduces feedback signals present in a radio frequency signal when the cancellation signal is added to the radio frequency signal in at least one of the respective uplink and downlink paths.