Coarse frequency offset estimation using a delayed auto-quadricorrelator in OFDM-based WLANs

Author

Kang, Hun-Sik ; Kim, Doyoung ; Park, Sin-Chong

Author_Institution

HD-VoIP Res. Team, ETRI, Daejeon, South Korea

fYear

2011

fDate

5-7 Oct. 2011

Firstpage

1

Lastpage

4

Abstract

This paper presents a frequency offset estimation scheme using a delayed auto-quadricorrelation method which takes advantage of the symmetric property of a short training preamble in OFDM-based WLANs. Based on the discovered symmetries between real and imaginary values in the short training preamble, we present an effective frequency offset estimation scheme which widens the estimation range to one quarter the sampling frequency (0.25f_s =5MHz) in an ideal condition and up to ten times the subcarrier spacing (10xf_sub = 3125 KHz) in WLAN under the noisy environment.

Keywords

OFDM modulation; correlation methods; frequency estimation; wireless LAN; OFDM-based WLAN; coarse frequency offset estimation; delayed auto-quadricorrelator; frequency 3125 kHz; frequency 5 MHz; training preamble; wireless LAN; Estimation; Frequency estimation; OFDM; Signal to noise ratio; Training; Wireless LAN; Auto-quadricorrelation; Frequency offset estimation; OFDM-based WLAN; Short training preamble; Symmetry;

fLanguage

English

Publisher

ieee

Conference_Titel

Ultra Modern Telecommunications and Control Systems and Workshops (ICUMT), 2011 3rd International Congress on

Conference_Location

Budapest

ISSN

2157-0221

Print_ISBN

978-1-4577-0682-0

Type

conf

Filename

6078976