Carrier Frequency Offset Estimation Using Extended Kalman Filter in Uplink OFDMA Systems

Author

Zhao, Pengkai ; Kuang, Linling ; Lu, Jianhua

Author_Institution

Department of Electronic Engineering, Tsinghua University, 100084, Beijing, P. R. China

Volume

6

fYear

2006

fDate

11-15 June 2006

Firstpage

2870

Lastpage

2874

Abstract

This paper presents a new carrier frequency offset (CFO) estimation algorithm with low-complexity for uplink OFDMA systems. Extended Kalman Filter (EKF) is employed in time domain, while the multiple access interference (MAI) cancellation strategy is combined in every recursion. In addition, an adaptive noise variance estimator is contrived for EKF, and a robust EKF method is derived for CFO estimation with data symbols. The proposed algorithm is suitable for online estimation, and can be applied to both preamble and data symbols. Simulation results show that it has a large estimation range, while approaching the Cramer-Rao Bound (CRB) closely with quite reduced complexity.

Keywords

Degradation; Design methodology; Frequency estimation; Frequency synchronization; Interference cancellation; Multiple access interference; Noise cancellation; Noise robustness; OFDM; Recursive estimation; Extended Kalman Filter; OFDMA; carrier frequency offset;

fLanguage

English

Publisher

ieee

Conference_Titel

Communications, 2006. ICC '06. IEEE International Conference on

Conference_Location

Istanbul

ISSN

8164-9547

Print_ISBN

1-4244-0355-3

Electronic_ISBN

8164-9547

Type

conf

DOI

10.1109/ICC.2006.255216

Filename

4024612