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Author Biao Chen ♦ Hao Wang
Sponsorship IEEE Signal Processing Society
Source IEEE Xplore Digital Library
Content type Text
Publisher Institute of Electrical and Electronics Engineers, Inc. (IEEE)
File Format PDF
Copyright Year ©1991
Language English
Subject Domain (in DDC) Natural sciences & mathematics ♦ Physics ♦ Electricity & electronics
Subject Keyword Frequency estimation ♦ Maximum likelihood estimation ♦ Fading ♦ Delay estimation ♦ Bandwidth ♦ Intersymbol interference ♦ OFDM modulation ♦ Streaming media ♦ Delay systems ♦ Numerical simulation
Abstract Blind deterministic estimation of the orthogonal frequency division multiplexing (OFDM) frequency offset via oversampling is proposed in this paper. This method utilizes the intrinsic phase shift of neighboring sample points incurred by the frequency offset that is common among all subcarriers. The proposed method is data efficient - it requires only a single OFDM symbol to achieve reliable estimation, hence making it more suitable to systems with stringent delay requirement and mobility-induced channel variation. The proposed scheme is devised to perfectly retrieve frequency offset in the absence of noise. Quite remarkably, we show that in the presence of channel noise, this intuitive scheme is indeed the maximum likelihood estimate of the carrier frequency offset. The possible presence of virtual carriers are also accommodated in the system model, and some interesting observations are obtained. The Cramer-Rao lower bound is derived for the oversampling-based signal model, and we show through numerical simulation that the proposed algorithm is efficient. Practical issues such as identifiability, the front-end filter bandwidth, and the possible presence of correlated noises are also carefully addressed.
Description Author affiliation :: Dept. of Electr. Eng. & Comput. Sci., Syracuse Univ., NY, USA
ISSN 1053587X
Education Level UG and PG
Learning Resource Type Article
Publisher Date 2004-07-01
Publisher Place U.S.A.
Rights Holder Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Volume Number 52
Issue Number 7
Size (in Bytes) 329.48 kB
Page Count 11
Starting Page 2047
Ending Page 2057


Source: IEEE Xplore Digital Library