Patent ID: 7764925

Claim:
A repeater for re-transmitting signals between a first wireless device and a second wireless device comprising: a first antenna array for receiving a forward channel signal transmitted from said first wireless device; a second antenna array for receiving a reverse channel signal transmitted from said second wireless device; a first transceiver chain capable of down-converting said received forward channel signal, processing said down-converted forward channel signal, and up-converting said processed forward channel signal to thereby produce an outgoing forward channel signal suitable for transmission to said second wireless device; and a second transceiver chain capable of down-converting said received reverse channel signal, processing said down-converted reverse channel signal, and up-converting said processed reverse channel signal to thereby produce an outgoing reverse channel signal suitable for transmission to said first wireless device, 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 each of said first and second transceiver chains further comprises an echo processor that delays transmission of said outgoing one of said forward and reverse channel signals in order to minimize an echo signal in a respective one of said down-converted forward and reverse channel signals, wherein said echo processor comprises a multiplier that multiplies a test code by an unused walsh code, combines the test code with at least one signal sample, and detects the echo from the signal sample.