Patent ID: 8351874

Claim:
A wireless transceiver with automatic antenna impedance matching, the transceiver comprising: a transmitter circuit configured to generate a phase-amplitude modulated signal based on a phase-amplitude modulation signal; a receiver circuit configured to downconvert one or more input signals and to produce digital baseband signals from downconverted signals; and an antenna system configured to couple the transmitter circuit and the receiver circuit to an antenna, the antenna system comprising a coupling circuit configured to couple a transmitter signal reflected from the antenna to the receiver circuit and further comprising an adjustable matching network between the antenna and at least the transmitter circuit; and a baseband processor configured to process digital signals produced by the receiver circuit from the reflected transmitter signal to: compensate the reflected transmitter signal using the phase-amplitude modulation signal to remove phase-amplitude modulation components in the reflected transmitter signal; characterize an impedance mismatch between the transmitter circuit and the antenna based on the compensated reflected transmitter signal; and control the adjustable matching network based on the characterization.