Title :
A blind frequency offset estimator for OFDM/OQAM systems
Author :
Ciblat, Philippe ; Serpedin, Erchin
Author_Institution :
ENST, Paris, France
Abstract :
Like other OFDM-like systems, OFDM/OQAM systems are very sensitive to carrier frequency offset. A new blind carrier frequency estimator is introduced herein for OFDM/OQAM systems by exploiting the noncircularity of the received signal. Since the received signal exhibits conjugate cyclic frequencies at twice the carrier frequency offset, a frequency estimator is proposed by maximizing a cost function expressed in terms of the sample conjugate cyclo-correlations. Computer simulations illustrate that the proposed estimator is very accurate whenever large observation windows are available, is robust to timing errors and frequency-selective fading effects.
Keywords :
OFDM modulation; frequency estimation; optimisation; quadrature amplitude modulation; OFDM/OQAM systems; blind frequency offset estimator; carrier frequency offset; conjugate cyclic frequencies; conjugate cyclo-correlations; cost function maximization; frequency-selective fading effects; large observation windows; received signal noncircularity; timing error robustness; Computer simulation; Costs; Frequency estimation; Interference; OFDM modulation; Pulse modulation; Radio transmitters; Robustness; TV broadcasting; Timing;
Conference_Titel :
Signal Processing Advances in Wireless Communications, 2003. SPAWC 2003. 4th IEEE Workshop on
Print_ISBN :
0-7803-7858-X
DOI :
10.1109/SPAWC.2003.1319030