| Paper: | SPCOM-P11.10 | ||
| Session: | CDMA and Spread-Spectrum Systems | ||
| Time: | Friday, May 21, 09:30 - 11:30 | ||
| Presentation: | Poster | ||
| Topic: | Signal Processing for Communications: (Blind/Semiblind) Channel Estimation | ||
| Title: | ITERATIVE CHANNEL ESTIMATION FOR TURBO RECEIVERS IN DS-CDMA | ||
| Authors: | Luis García; Universitat Politècnica de Catalunya (UPC) | ||
| Alba Pagès-Zamora; Universitat Politècnica de Catalunya (UPC) | |||
| Javier R. Fonollosa; Universitat Politècnica de Catalunya (UPC) | |||
| Abstract: | This work considers the problem of channel estimation in the iterative reception of pilot-aided signals inDS-CDMA systems. The performance of classical training-based schemes is severely degraded in highly frequencyselective channels due to the code-multiplexing of traffic and pilot signals. Thus, estimation algorithms thatrely on the presence of the pilot signal but also consider the information signal structure are preferred. Inthis paper we present a bayesian channel estimation algorithm for turbo receivers that effectively exploits theavailable soft information about the symbols (to model the traffic signal) in order to iteratively improve thechannel estimation. Simulation results in realistic frequency selective test cases reveal only a moderatedegradation compared to the perfect channel knowledge case. | ||
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