DocumentCode :
3332149
Title :
Compensation of transmitter IQ imbalance for OFDM systems
Author :
Tubbax, Jan ; Côme, Boris ; Van der Perre, Liesbet ; Donnay, Stéphane ; Moonen, Marc ; De Man, Hugo
Author_Institution :
IMEC, Leuven, Belgium
Volume :
2
fYear :
2004
fDate :
17-21 May 2004
Abstract :
Zero-IF transceivers are gaining interest because of their potential to enable low-cost OFDM terminals. However, the zero-IF architecture introduces IQ imbalance which may have a huge impact on the performance. Rather than increasing 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 at the transmitter. We analyze transmit IQ imbalance estimation and propose a low-cost, highly effective estimation scheme, which is fully digital and located at the receiver. Performance analysis shows that this scheme can provide up to 4 dB gain while meeting the IEEE 802.11a constellation accuracy specification and more if larger IQ imbalance is present in the transmitter. It therefore enables the design of low-cost, low-complexity OFDM modems.
Keywords :
OFDM modulation; modems; parameter estimation; radio receivers; radio transmitters; IEEE 802.11a constellation accuracy specification; OFDM modems; receiver; transmit IQ imbalance estimation; transmitter IQ imbalance compensation; zero-IF transceivers; Costs; Degradation; Frequency domain analysis; Hardware; Modems; OFDM; Performance analysis; Performance gain; Transceivers; Transmitters;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Acoustics, Speech, and Signal Processing, 2004. Proceedings. (ICASSP '04). IEEE International Conference on
ISSN :
1520-6149
Print_ISBN :
0-7803-8484-9
Type :
conf
DOI :
10.1109/ICASSP.2004.1326260
Filename :
1326260
Link To Document :
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