Patent ID: 7844216

Claim:
A repeater for re-transmitting an incoming RF signal comprising: a first antenna array for receiving said incoming RF signal; a second antenna array for transmitting an outgoing RF signal; and a transceiver chain capable of down-converting said incoming RF signal to a down-converted signal, processing said down-converted signal, and up-converting said processed signal to thereby produce said outgoing RF signal, wherein said first antenna array comprises a first antenna element and said second antenna array comprises a second antenna element that is cross-polarized with respect to said first antenna element, wherein said transceiver chain further comprises an echo processor capable of attenuating in said down-converted signal an echo signal associated with said outgoing RF signal, and wherein said echo processor comprises a delay buffer configured to delay transmission of said outgoing RF signal for a period of time, the time period based on the echo signal and determined by detecting a time-delayed, cross-polarized test code signal using at least one of correlation and matched filter techniques in the FFT domain, the test code signal being a known test code signal.