Patent ID: 7822389

Claim:
A receiver system for use in conjunction with a transceiver having an antenna, a duplexer coupled to the antenna, a transmitter coupled to the duplexer to output a transmit signal at a transmit frequency, and a signal processor coupled to the transmitter and receiver, the receiver system comprising: a receiver coupled to the duplexer to receive a received signal at a receiver frequency; an auxiliary receiver tuned to the transmit frequency to process the transmit signal, to produce an auxiliary receiver signal and to couple the auxiliary receiver signal to the signal processor; a local oscillator producing a local oscillator transmit frequency in-phase (I) channel signal and a local oscillator transmit frequency quadrature (Q) channel signal; a first mixer having a first input coupled to the local oscillator transmit frequency I-channel signal and a second input coupled to the auxiliary receiver input to output a mixed I-channel signal; and a second mixer having a first input coupled to the local oscillator transmit frequency Q-channel signal and a second input coupled to the auxiliary receiver input to output a mixed Q-channel signal.