Time-Frequency Modeling and Estimation of Wireless OFDM Channels
WSEAS Transactions on Computer Communications, vol.4, pp.815-820, 2005 (Peer-Reviewed Journal)
- Publication Type: Article / Article
- Volume: 4
- Publication Date: 2005
- Journal Name: WSEAS Transactions on Computer Communications
- Page Numbers: pp.815-820
- Istanbul University Affiliated: Yes
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, andmulti-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.