Frequency offset estimation and correction in the IEEE 802.11a WLAN

Author

Sourour, Essam ; El-Ghoroury, Hussein ; McNeill, Dale

Author_Institution

Ellipsis Digital Syst., Inc., Carlsbad, CA, USA

Volume

7

fYear

2004

fDate

26-29 Sept. 2004

Firstpage

4923

Abstract

The paper shows how to utilize the short training sequence, long training sequence and pilot subcarriers of the IEEE 802.11a frame, to estimate and equalize the effect of both carrier and sampling frequency offset. To reduce cost, the equalization process is performed digitally. Using computer simulation, we show that the presented scheme nearly eliminates the degradation due to frequency offset for all IEEE 802.11a modulation schemes. The performance measures are the root-mean-squared error (RMSE) and BER in a fading channel.

Keywords

OFDM modulation; equalisers; error statistics; fading channels; frequency estimation; mean square error methods; wireless LAN; BER; IEEE 802.11a WLAN; OFDM; RMSE; carrier frequency offset; equalization; fading channel; frequency offset correction; frequency offset estimation; long training sequence; modulation schemes; pilot subcarriers; root-mean-squared error; sampling frequency offset; short training sequence; Computer simulation; Costs; Digital systems; Fading; Frequency diversity; Frequency estimation; Frequency synchronization; OFDM modulation; Sampling methods; Wireless LAN;

fLanguage

English

Publisher

ieee

Conference_Titel

Vehicular Technology Conference, 2004. VTC2004-Fall. 2004 IEEE 60th

ISSN

1090-3038

Print_ISBN

0-7803-8521-7

Type

conf

DOI

10.1109/VETECF.2004.1405033

Filename

1405033