Maximum-likelihood estimation of frequency and time offsets in OFDM systems with multiple sets of identical data

Author

Cheng, Mu-Huo ; Chou, Chi-Chan

Author_Institution

Dept. of Electr. & Control Eng., Nat. Chiao Tung Univ., Hsinchu

Volume

54

Issue

7

fYear

2006

fDate

7/1/2006 12:00:00 AM

Firstpage

2848

Lastpage

2852

Abstract

This paper generalizes the existing algorithm for the maximum-likelihood (ML) estimation of frequency and time offsets in orthogonal frequency-division multiplexing (OFDM) systems using from two sets to multiple sets of identical data. The algorithm is derived by the application of the matrix inversion lemma; the Crameacuter-Rao bound for estimation of the frequency offset is also obtained. For reducing realization complexity, a simplified algorithm is developed. Simulations using the ten sets of identical data in the preamble of IEEE 802.11a for estimation of frequency and time offsets have been performed to verify the effectiveness of the proposed algorithms

Keywords

OFDM modulation; computational complexity; frequency estimation; maximum likelihood estimation; wireless LAN; Cramer-Rao bound; IEEE 802.11a; OFDM systems; frequency estimation; identical data sets; matrix inversion lemma; maximum-likelihood estimation; orthogonal frequency-division multiplexing; realization complexity reduction; time offset estimation; AWGN; Frequency division multiplexing; Frequency estimation; Frequency synchronization; Maximum likelihood estimation; OFDM; Sampling methods; Signal processing algorithms; TV broadcasting; Wireless communication; IEEE 802.11a; maximum-likelihood (ML) estimation; orthogonal frequency-division multiplexing (OFDM);

fLanguage

English

Journal_Title

Signal Processing, IEEE Transactions on

Publisher

ieee

ISSN

1053-587X

Type

jour

DOI

10.1109/TSP.2006.874837

Filename

1643928