| Paper: | SPCOM-L6.5 | ||
| Session: | Channel Estimation & Equalization | ||
| Time: | Friday, May 19, 11:20 - 11:40 | ||
| Presentation: | Lecture | ||
| Topic: | Signal Processing for Communication: Multi-carrier, OFDM, and DMT communication | ||
| Title: | Channel Estimation and Windowed DFE for OFDM with Doppler Spread | ||
| Authors: | Luca Rugini, Paolo Banelli, Rocco Claudio Cannizzaro, University of Perugia, Italy; Geert Leus, Technical University of Delft, Netherlands | ||
| Abstract: | Multicarrier systems are seriously affected by time-varying frequency-selective channels. Recently, windowing and decision-feedback equalization (DFE) have separately been proven to boost the performance of minimum mean-squared error (MMSE) block equalization, while maintaining a very low complexity by capitalizing on a band LDL factorization. This paper jointly considers receiver windowing and DFE, as well as the impact on the performance of a pilot-based frequency-domain channel estimation technique that relies on a basis expansion model (BEM) approach. We show that the combination of windowing and DFE still allows the use of a low-complexity band LDL factorization. Therefore, we can further improve the BER of OFDM systems affected by severe Doppler spread, while preserving linear complexity in the number of subcarriers. | ||
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