NDLI: I/Q mismatch compensation in zero-IF OFDM receivers with application to DAB

Content Provider	IEEE Xplore Digital Library
Author	Wright, A.R. Naylor, P.A.
Copyright Year	2003
Description	Author affiliation: Dept. of Electr. & Electron. Eng., Imperial Coll., London, UK (Wright, A.R.; Naylor, P.A.)
Abstract	This work addresses the I/Q mismatch problem which arises due to analog component tolerances in zero-IF OFDM receivers. The application of this work is to digital audio broadcasting (DAB). The approach is to employ a decision directed LMS-based frequency-adaptive equalizer, applied to OFDM demodulated carriers. The equalizer is trained initially using the phase reference symbols in each frame and is switched to a decision directed mode when the error reaches a defined level. In the decision directed mode, the output is taken prior to the threshold decision device in order to present to the subsequent Viterbi decoder a signal suitable for soft decisions. Simulation results demonstrate convergence within six frames; the particular convergence rate depending on choice of step-size and number of carriers per group employed. Even with large phase and amplitude imbalances, 25/spl deg/ and 5 dB respectively, in a DAB system the compensation algorithm attains a reduction in raw BER from 10/sup -1.5/ to 10/sup -5/ with a 15 dB SNR.
Sponsorship	IEEE Signal Process, Soc
File Size	225713
File Format	PDF
ISBN	0780376633
ISSN	15206149
DOI	10.1109/ICASSP.2003.1202361
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2003-04-06
Publisher Place	China
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	OFDM Demodulation Decoding RF signals Adaptive equalizers Convergence Filters Digital video broadcasting Educational institutions Digital audio broadcasting
Content Type	Text
Resource Type	Article

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