Title
Joint compensation of IQ imbalance and frequency offset in OFDM systems
Author
Publication type
conferenceObject
Publication
Subject
Mass communications
Source (journal)
Boston 2003 Radio & Wireless Rawcon conference, proceedings
Source (book)
IEEE Radio and Wireless Conference (RAWCON 2003), AUG 10-13, 2003, BOSTON, MA
Volume/pages
(2003) , p. 39-42
ISBN
0-7803-7829-6
ISI
000185329800010
Carrier
E
Target language
English (eng)
Affiliation
University of Antwerp
Abstract
Zero-IF receivers are gaining interest because of their potential to enable low-cost OFDM terminals. However, Zero-IF receivers introduce IQ imbalance which may have a huge impact on the performance. Rather than increasing design time or component cost to decrease the IQ imbalance, an alternative is to tolerate the IQ imbalance and compensate it digitally. Current solutions require extra analog hardware or converge too slowly for bursty communication. Moreover, the tremendous impact of a frequency offset on the IQ estimation/compensation problem is not considered. In this paper, we analyze the joint IQ imbalance-frequency offset estimation and propose a low-cost, highly effective, all-digital compensation scheme. For large IQ imbalance (epsilon = 10%, Deltaphi = 10degrees) and large frequency offsets, our solution results in an average implementation loss below 0.5 dB. It therefore enables the design of low-cost, low-complexity OFDM receivers.
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