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

fYear

2009

fDate

Nov. 30 2009-Dec. 4 2009

Firstpage

1

Lastpage

6

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;

fLanguage

English

Publisher

ieee

Conference_Titel

GLOBECOM Workshops, 2009 IEEE

Conference_Location

Honolulu, HI

Print_ISBN

978-1-4244-5626-0

Electronic_ISBN

978-1-4244-5625-3

Type

conf

DOI

10.1109/GLOCOMW.2009.5360733

Filename

5360733