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Multipath effect mitigation in LPTV-based multiple access system

Cristea, Bogdan and Roviras, Daniel and Escrig, Benoît Multipath effect mitigation in LPTV-based multiple access system. (2005) In: EUSIPCO 2005 : 13th European Signal Processing Conference, 4 September 2005 - 8 September 2005 (Antalya, Turkey).

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Official URL: http://www.eurasip.org/Proceedings/Eusipco/Eusipco2005/defevent/papers/cr1050.pdf


A multiple access system is developed in this paper by means of Linear Periodic Time Varying (LPTV) lters. We construct an LPTV-based Multiple Access (LPTVMA) system with complex modulators and matrix interleavers. This LPTVMA system has good spreading properties and small Multi User Interference (MUI). However, the equalization problem of such LPTV lters in stationary multipath channels remains unsolved. We show that, due to the presence of matrix interleavers, the received signal is affected by a time varying delay. By using a Zero Padding (ZP) technique, classical single user equalization techniques can be used. Further, when the users in the LPTVMA system are quasi-synchronous, MUI-free transceivers can be achieved. Comparisons of the LPTVMA system with a Chip Interleaved Block Spread (CIBS) - CDMA system are made in quasi-synchronous and asynchronous scenarios. Simulations showed that the LPTVMA system has better performances in the asynchronous scenario than the CIBS-CDMA system.

Item Type:Conference or Workshop Item (Paper)
HAL Id:hal-04092029
Audience (conference):International conference proceedings
Uncontrolled Keywords:
Institution:Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
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Deposited On:16 Jun 2009 07:06

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