Title :
Improved Frequency Synchronization Method for MB-OFDM Ultra-Wideband Communications
Author :
Sen, Debarati ; Chakrabarti, Saswat ; Kumar, R. V Raja
Author_Institution :
SAIT India Lab., Samsung Electron., Bangalore, India
fDate :
Nov. 30 2009-Dec. 4 2009
Abstract :
We present a fast converging scheme for estimating the coarse frequency offset in multi-band orthogonal frequency division multiplexing (MB-OFDM) based ultra-wideband (UWB) systems. Our estimator performs an averaging of initial estimate over multiple bands and shows an improved estimation of =3 times for band group 1 compared to our earlier proposed scheme. Cramer Rao lower bound (CRLB) on the estimation error and bit-error rate (BER) performances with our estimator, multi-band averaged frequency synchronizer (MBAFS), is studied and compared with for 100,000 noisy realizations in all UWB channel models (CM), CM1-CM4. To prove the efficiency of our scheme, we compare the estimation error variance with the reported results of ML estimation by Yak et al. and BLUE estimation by Jacobs et al., and show its superiority over. Also, computational complexity of MBAFS is analyzed for its usability evaluation.
Keywords :
OFDM modulation; channel estimation; estimation theory; synchronisation; ultra wideband communication; MB-OFDM; coarse frequency offset estimation; frequency synchronization method; multiband averaged frequency synchronizer; multiband orthogonal frequency division multiplexing Cramer-Rao lower bound; ultrawideband communications; Bit error rate; Computational complexity; Estimation error; Frequency estimation; Frequency synchronization; Jacobian matrices; Maximum likelihood estimation; OFDM; Ultra wideband technology; Usability;
Conference_Titel :
GLOBECOM Workshops, 2009 IEEE
Conference_Location :
Honolulu, HI
Print_ISBN :
978-1-4244-5626-0
Electronic_ISBN :
978-1-4244-5625-3
DOI :
10.1109/GLOCOMW.2009.5360733
