Title :
Analysis of IQ imbalance on initial frequency offset estimation in direct down-conversion receivers
Author :
Ma, Vincent K P ; Ylamurto, Tommi
Author_Institution :
Electron. Lab., Nokia Res. Center, Mountain View, CA, USA
Abstract :
The effect of IQ imbalance on the initial frequency offset estimation algorithm in an orthogonal frequency division multiplexing (OFDM) direct conversion receiver is studied. The impact of the phase and amplitude IQ imbalances and channel response on the frequency offset estimation is formulated for a flat channel case. Analysis of the IQ imbalance on the frequency offset estimation is provided and the results are presented in this paper. The results show that the frequency offset estimation algorithm generates an error in the estimated offset frequency with IQ imbalance and the error can be reduced by an appropriate choice of the correlation window length
Keywords :
OFDM modulation; correlation methods; frequency estimation; parameter estimation; radio receivers; telecommunication channels; IQ imbalance analysis; OFDM; amplitude IQ imbalance; channel response; correlation window length; direct down-conversion receivers; flat channel; initial frequency offset estimation algorithm; orthogonal frequency division multiplexing; phase IQ imbalance; Amplitude estimation; Degradation; Estimation error; Frequency conversion; Frequency estimation; Hardware; Laboratories; OFDM modulation; Phase estimation; Transmitters;
Conference_Titel :
Wireless Communications, 2001. (SPAWC '01). 2001 IEEE Third Workshop on Signal Processing Advances in
Conference_Location :
Taiwan
Print_ISBN :
0-7803-6720-0
DOI :
10.1109/SPAWC.2001.923870
