Patent ID: 8571489

Claim:
A radio front end comprises: a power amplifier operably coupled to amplify an up-converted signal to produce an outbound wireless signal; a tone injection module operable, in a first mode, to produce a tone having a carrier frequency that is substantially similar to a carrier frequency of an inbound wireless signal; a duplexer operably coupled to an antenna, the power amplifier, and the tone injection module, wherein the duplexer is operable, in the first mode, to provide electrical isolation between the outbound wireless signal and a combination signal of the tone and inbound wireless signal and is operable, in a second mode, to provide electrical isolation between the outbound wireless signal and the 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; a processing module operable in the first mode to: determine an amplitude of a tone component of the combination signal; correlate the amplitude of the tone component to an inbound frequency band isolation; and adjust baseband processing of a down converted representation of the combination signal based on the inbound frequency band isolation.