Patent ID: 8805298

Claim:
A method of operating an RF transceiver to compensate for leakage of an RF transmit signal into an RF receive signal, said method comprising: obtaining a forward communication signal in a transmitter portion of said transreceiver; upconverting said forward communication signal to generate said RF transmit signal; deriving a first cancellation signal, which is at RF, is derived from said RF transmit signal, and exhibits spectral components which overlap at least a portion of said RF receive signal; combining said first cancellation signal at RF with said RF receive signal to cancel a first portion of said leakage of said RF transmit signal into said RF receive signal and to form a first leakage-compensated receive signal, which is at RF; forming a second cancellation signal which is a digitized data stream, is at baseband, is derived from said forward communication signal, and is nonlinearly related to said RF transmit signal; downconverting and digitizing said first leakage-compensated receive signal to form a downconverted and digitized receive signal stream; and combining said second cancellation signal and said downconverted and digitized receive signal stream to cancel a second portion of said leakage of said RF transmit signal into said RF receive signal and to form a second leakage-compensated receive signal, which is a digitized data stream and is at baseband frequency.