文章基本信息

标题：A Fast and Precise Blind I/Q Mismatch Compensation for Image Rejection in Direct-Conversion Receiver
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作者：Kim, Suna ; Yoon, Dae-Young ; Park, Hyung Chul 等
期刊名称：ETRI Journal
印刷版ISSN：1225-6463
电子版ISSN：2233-7326
出版年度：2014
卷号：36
期号：1
页码：12-21
DOI：10.4218/etrij.14.0113.0320
语种：English
出版社：Electronics and Telecommunications Research Institute
摘要：In this paper, we propose a new digital blind in-phase/quadrature-phase (I/Q) mismatch compensation technique for image rejection in a direct-conversion receiver (DCR). The proposed image-rejection circuit adopts DC offset cancellation and a sign-sign least mean squares (LMS) algorithm with a unique step size adaptation both for a fast and precise I/Q mismatch estimation. In addition, several performance-optimizing design considerations related to accuracy, speed, and hardware simplicity are discussed. The implementation of the proposed circuit in an FPGA results in an image-rejection ratio (IRR) of 65 dB, which is the best performance with modulated signals, along with an adaptation time of 0.9 seconds, which is a tenfold increase in the compensation speed as compared to previously reported circuits. The proposed technique will be a promising solution in the area of image rejection to increase both the speed and accuracy of future DCRs.
关键词：Image rejection;I/Q gain mismatch;I/Q phase mismatch;DC offset;direct-conversion receiver; DCR;low-IF;zero-IF;LMS algorithm;adaptive step size