IQ mismatch correction module

Abstract

The disclosure relates to an IQ mismatch correction module for a radio receiver, the IQ mismatch correction module comprising: an input terminal configured to receive an input signal; an output terminal configured to provide a filtered output signal; a mismatch detection module comprising: one or more bandpass filters configured to receive, from the input terminal or output terminal, a bandpass input signal and to pass a plurality of sub-bands of the bandpass input signal to provide respective bandpass filtered signals; one or more amplitude and phase mismatch detectors configured to determineamplitude and phase mismatch coefficients based on the bandpass filtered signals from the plurality of sub-bands; a transformation unit configured to apply a transformation to the amplitude and phasemismatch coefficients to provide correction filter coefficients for the plurality of sub-bands; and a filter module configured to: receive the filter coefficients for the plurality of sub-bands fromthe mismatch detection module; and filter the input signal in accordance with the received filter coefficients to provide the filtered output signal.

Description

Technical field The present invention relates to in-phase / quadrature (IQ) mismatch detection and correction in radio frequency receivers, and specifically (though not exclusively) to IQ mismatch correction modules for radio frequency receivers. Background technique Modern radio frequency receivers (e.g., those used for broadband data reception) usually include both analog and digital sections in order to efficiently process signals. The difficulty in conventional radio frequency receivers involves providing the required image rejection characteristics in an efficient manner. Summary of the invention According to a first aspect of the present invention, an IQ mismatch correction module for a radio receiver is provided, and the IQ mismatch correction module includes: An input terminal, which is configured to receive an input signal; An output terminal, which is configured to provide a filtered output signal; The mismatch detection module includes: One or more band-pass filte...

AI Technical Summary

Problems solved by technology

Difficulties in conventional RF receivers relate to providing the required image rejection characteristics in an efficient manner

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