Title :
Imbalance-compensated direct down conversion receiver for UMTS base stations
Author :
Bitzer, T. ; Endress, F. ; Pascht, A. ; Schreiter, M.
Author_Institution :
Alcatel SEL AG, Stuttgart, Germany
Abstract :
In this work, a new method for the estimation and the compensation of in-phase quadrature-imbalances in direct down conversion receivers is presented. The considerations are based on a receiver structure that is developed for the simultaneous down conversion of up to four neighboring carriers in universal mobile telecommunications system base stations. The image suppression of the system must achieve at least 60 dB. This requirement is not fulfilled by the analogue part and hence, an error estimation and compensation in the digital domain is necessary. In laboratory measurements using a wideband code-division multiple-access signal, the image suppression of the complete set-up including the analogue parts could be improved by 34 dB.
Keywords :
3G mobile communication; code division multiple access; radio receivers; UMTS base stations; digital domain; direct down conversion receiver; error compensation; error estimation; imbalance-compensated conversion receiver; in-phase quadrature-imbalances; receiver structure; simultaneous down conversion; system image suppression; universal mobile telecommunications system; wideband code-division multiple-access signal; 3G mobile communication; Base stations; Broadband amplifiers; Error analysis; Frequency; Image converters; Low-noise amplifiers; Mixers; Multiaccess communication; Wideband; -imbalance; Direct down conversion; IQ; UMTS; W-CDMA; image suppression; in-phase quadrature; universal mobile telecommunications system; wideband code-division multiple-access;
Journal_Title :
Microwave and Wireless Components Letters, IEEE
DOI :
10.1109/LMWC.2004.832627