A Fast and Precise Blind I/Q Mismatch Compensation for Image Rejection in Direct-Conversion Receiver

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In this paper, we propose a new digital blind inphase/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.
Publisher
ELECTRONICS TELECOMMUNICATIONS RESEARCH INST
Issue Date
2014-02
Language
English
Article Type
Article
Citation

ETRI JOURNAL, v.36, no.1, pp.12 - 21

ISSN
1225-6463
DOI
10.4218/etrij.14.0113.0320
URI
http://hdl.handle.net/10203/189732
Appears in Collection
EE-Journal Papers(저널논문)
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