| Paper: | SS-3.2 | ||
| Session: | Wireless Communications over Rapidly Time-Varying Channels | ||
| Time: | Tuesday, May 18, 15:47 - 16:04 | ||
| Presentation: | Special Session Lecture | ||
| Topic: | Special Sessions: Wireless Communications over Rapidly Time-Varying Channels | ||
| Title: | TIME-DOMAIN CHANNEL SHORTENING AND EQUALIZATION OF OFDM OVER DOUBLY-SELECTIVE CHANNELS | ||
| Authors: | Imad Barhumi; Katholieke Universiteit Leuven | ||
| Geert Leus; Delft University of Technology | |||
| Marc Moonen; Katholieke Universiteit Leuven | |||
| Abstract: | In this paper, we discuss time-domain equalization of OFDM over doubly-selective channels. We consider the most general case, where the channel delay spread is larger than thecyclic prefix (CP), which results into inter-blockinterference (IBI). IBI in conjunction with the Doppler effectdestroys the orthogonality between subcarriers and hence, results in intercarrier interference (ICI). The time-domain equalizer (TEQ) isassumed to be a time-varying finite impulse response (TV FIR). Thepurpose of the TEQ is to convert the doubly-selective channel into apurely frequency-selective channel whose delay spread fits withinthe CP. In other words, the purpose of the TEQ is to restoreorthogonality between subcarriers in the OFDM system. | ||
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