Time-frequency modeling and estimation of wireless OFDM channels

Authors:
Aydin Akan;Luis F. Chaparro
Affiliations:
Department of Electrical and Electronics Engineering, Istanbul University, Istanbul, Turkey;Department of Electrical and Computer Engineering, University of Pittsburgh, Pittsburgh, PA
Venue:
ICCOMP'05 Proceedings of the 9th WSEAS International Conference on Computers
Year:
2005

Citing 3
Cited 0

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Blind OFDM channel estimation through simple linear precoding

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Abstract

Orthogonal Frequency Division Multiplexing (OFDM) has become a very popular method for high data rate wireless communications because of its advantages over single carrier modulation schemes on multi-path, frequency selective fading channels. However, inter-carrier interference due to Doppler frequency shifts, and multi-path fading severely degrades the performance of OFDM systems. Estimation of channel parameters is required at the receiver. In this paper, we present a channel modeling and estimation method based on time-frequency representation of the received signal. The Discrete Evolutionary Transform provides a time-frequency procedure to obtain a complete characterization of the multi-path, fading and frequency selective channel. Performance of the proposed method is tested on different levels of channel noise, Doppler frequency shifts, and jamming interference powers.