Patent ID: 8364184

Claim:
A method for canceling a transmitted signal from a received combined signal, the received combined signal comprising signals of interest overlaying a relayed version of the transmitted signal, the method comprising: demodulating a sample of the transmitted signal and producing digitally sampled I/Q symbols of a transmitted signal sample; demodulating a combined signal and producing digitally sampled I/Q symbols of the combined signal; modulating the digitally sampled I/Q symbols of the transmitted signal sample and increasing the number of samples per symbol; modulating the digitally sampled I/Q symbols of the combined signal and increasing the number of samples per symbol; correlating the digitally sampled I/Q symbols of the transmitted signal sample with the digitally sampled I/Q symbols of the combined signal and determining an offset or a delay between the relayed version of the transmitted signal included in the combined signal and the transmitted signal; delaying the digitally sampled I/Q symbols of the transmitted signal sample in accordance with the offset or delay determined by a correlator, and producing sampled symbols of a delayed transmitted signal; rotating a phase and adjusting an amplitude of the delayed transmitted signal and producing digitally sampled I/Q symbols of a cancellation signal; digitally subtracting the digitally sampled I/Q symbols of the cancellation signal from the digitally sampled I/Q symbols of the combined signal and canceling the relayed version of the transmitted signal from the combined signal; and providing a subtraction result as an output signal.