Patent ID: 8923168

Claim:
A radio front end comprises: an antenna tuning unit operably coupled to an antenna and operable to tune an operational characteristic of the antenna based on an antenna tuning signal; a duplexer operably coupled to the antenna tuning unit and operable to provide electrical isolation between an outbound wireless signal and an inbound wireless signal; a balancing network operably coupled to the duplexer and operable to establish an impedance that substantially matches an impedance of the antenna based on a coarse tuning signal from a detected non-linearity of a power amplifier and a fine tuning signal from a detected transmit leakage of the duplexer; and a processing module operable to: estimate the impedance of the antenna to produce an estimated antenna impedance; generate the antenna tuning signal based on the estimated antenna impedance; generate a balancing network tuning signal based on an electrical performance characteristic of the duplexer; and establish the impedance based on the balancing network tuning signal, wherein the processing module estimates the impedance of the antenna after the balancing network has established the impedance.