DocumentCode :
428004
Title :
Decision directed methods of I/Q imbalance compensation in OFDM systems
Author :
Rykaczewski, Piotr ; Brakensie, Jörg ; Jondral, Friedrich K.
Author_Institution :
Karlsruhe Univ., Germany
Volume :
1
fYear :
2004
fDate :
26-29 Sept. 2004
Firstpage :
484
Abstract :
Non linearities of analog hardware result in phase and amplitude imbalance in case of zero-IF receivers, which imply direct down-conversion of the RF signal. The compensation of undesirable effects must be performed in the digital baseband. In particular, OFDM based systems are likely to suffer from imbalances due to distortions introduced by the time-to-frequency transformation of the filtered signal in case of any I/Q imbalance. This paper introduces two decision directed compensation methods: hard decision based and blind source separation based, operating in the time and frequency domains, respectively. Time and frequency domain compensation methods are compared, and corresponding analytical models analyzed. Special emphasis is placed on applicability of the compensation methods to OFDM communication systems. The theoretical study is accompanied by a presentation of simulation results involving an IEEE 802.11a system.
Keywords :
IEEE standards; OFDM modulation; blind source separation; compensation; frequency-domain analysis; telecommunication standards; time-domain analysis; wireless LAN; I/Q imbalance compensation; IEEE 802.11a system; OFDM communication systems; OFDM systems; amplitude imbalance; analog hardware nonlinearities; analytical models; blind source separation based compensation; decision directed methods; direct RF signal down-conversion; distortions; frequency domain compensation; hard decision based compensation; phase imbalance; simulation; time domain compensation; time-to-frequency filtered signal transformation; zero-IF receivers; Baseband; Blind source separation; Communication systems; Distortion; Equations; Frequency domain analysis; Hardware; OFDM; Receivers; Source separation;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Vehicular Technology Conference, 2004. VTC2004-Fall. 2004 IEEE 60th
ISSN :
1090-3038
Print_ISBN :
0-7803-8521-7
Type :
conf
DOI :
10.1109/VETECF.2004.1400053
Filename :
1400053
Link To Document :
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