Inter-carrier bandwidth control for mitigating IQ imbalance

A method of receiving and processing at least first and second communication signals concurrently in respective first and second branches of a receiver, wherein the first signal is modulated onto a first carrier having a first bandwidth, and the second signal is modulated onto a second carrier having a second bandwidth, each branch operative to process In-phase (I) and Quadrature (Q) components of the received signals, the method comprising the steps of:

• receiving the first and second signals;
• setting the frequency response of signal processing elements in the first receiver branch to a frequency response sufficient to not attenuate at least the first signal;
• processing the first signal in the first receiver branch;
• setting the frequency response of signal processing elements in the second receiver branch to a frequency response sufficient to not fully attenuate received signals within a frequency band of interest, the width of which is greater than the carrier bandwidth of the second signal, so as to include information from at least part of the first signal, outside of the carrier bandwidth of the second signal, in an image of the first signal appearing in the second receiver branch due to IQ imbalance;
• processing the second signal in the second receiver branch;
• estimating the IQ imbalance in the first and second received signals;
• and
• jointly compensating the estimated IQ imbalance over the first and second received signals.