Method and apparatus to use auxiliary receiver to compensate IQ imbalance in multiple transmitters based upon one of the transmitters

摘要

A communications device (20') includes a plurality of wireless transmitters (22', 42') operable at different respective frequencies and each configured to generate respective IQ signals having an initial IQ imbalance. An auxiliary receiver (62') is coupled to a given wireless transmitter. In addition, a controller (21') is configured to apply predistortion to the each wireless transmitter of the plurality thereof based upon the initial IQ imbalance generated by the given wireless transmitter to reduce the initial IQ imbalance in each wireless transmitter.