Decision-Directed Channel Estimation and High I/Q Imbalance Compensation in OFDM Receivers

Author

Traverso, Sylvain ; Ariaudo, Myriam ; Fijalkow, Inbar ; Gautier, Jean-Luc ; Lereau, Christian

Author_Institution

Dept. of Embedded Digital Syst., THALES Land & Joint Syst., Colombes

Volume

57

Issue

5

fYear

2009

fDate

5/1/2009 12:00:00 AM

Firstpage

1246

Lastpage

1249

Abstract

Direct-conversion architectures suffer from the mismatch between the in-phase (I) and the quadrature-phase (Q) branches, commonly called I/Q imbalance. Even low I/Q imbalances imply poor performance of orthogonal frequency division multiplexing (OFDM) systems. In this paper, we propose a new algorithm that uses both training and data symbols in a decision-directed fashion to jointly estimate the channel and compensate for high receiver I/Q imbalance. Simulation results show that our method can compensate for high I/Q imbalance values and also estimate a frequency selective channel.

Keywords

OFDM modulation; channel estimation; compensation; I/Q imbalance compensation; OFDM receiver; decision-directed frequency-selective channel estimation; direct-conversion architecture; orthogonal frequency division multiplexing system; Channel estimation; Communications Society; Degradation; Digital systems; Filtering; Frequency estimation; Frequency response; Interference; OFDM; Signal to noise ratio; I/Q imbalance, Orthogonal Frequency Division Multiplexing (OFDM), zero-IF, equalization;

fLanguage

English

Journal_Title

Communications, IEEE Transactions on

Publisher

ieee

ISSN

0090-6778

Type

jour

DOI

10.1109/TCOMM.2009.05.070161

Filename

4939214