Estimation and compensation of IQ-imbalances in direct down
17 November 2003
A new method for the estimation and the compensation of IQ-imbalances in direct conversion receivers is presented. The considerations are based on a multi carrier receiver structure for universal mobile telecommunications systems (UMTS) base stations with a required image suppression of at least 60 dB. Therefore an error compensation in the digital domain is necessary. In laboratory measurements using a W-CDMA signal, the image suppression could be improved by 50.3 dB to a resulting value of 75.1 dB.