Title :
Blind, low complexity estimation of time and frequency offsets in OFDM systems
Author_Institution :
Dept. of Electr. Eng. & Comput. Sci., Univ. of California, Irvine, Irvine, CA, USA
Abstract :
A novel blind time and frequency offset estimator for orthogonal frequency division multiplexing (OFDM) systems is presented. The estimator exploits a basic assumption of OFDM: the channel order is less than or equal to the length of the cyclic prefix. Under this assumption, it is shown that the last sample of the received cyclic prefix is not corrupted by intersymbol interference and this sample can be used to estimate the time of arrival (TOA) in multipath channels. It is demonstrated that the proposed estimator identifies the correct TOA with higher probability than existing estimators for medium to high signal-to-noise ratios.
Keywords :
OFDM modulation; blind source separation; frequency estimation; intersymbol interference; multipath channels; time-of-arrival estimation; OFDM system; TOA estimation; blind frequency offset low complexity estimator; blind time offset low complexity estimator; cyclic prefix; intersymbol interference; multipath channels; orthogonal frequency division multiplexing system; probability; signal-to-noise ratios; time-of-arrival estimation; Channel estimation; Frequency conversion; Frequency division multiplexing; Frequency estimation; Multipath channels; OFDM; Time-frequency analysis; OFDM; carrier frequency offset; symbol time offset; synchronization;
Conference_Titel :
Signals, Systems and Computers, 2014 48th Asilomar Conference on
Print_ISBN :
978-1-4799-8295-0
DOI :
10.1109/ACSSC.2014.7094441
