A Deterministic Ultra Wideband Channel Modeling - Yves Lostanlen
Multiple-Access (SSMA) using Time Hopping (TH) modu- ... The classical model, due to its statistical nature, does not .... field for two orthogonal polarizations.
Bernard Uguen , Eric Plouhinec , Yves Lostanlen , Gérard Chassay , (1) LCST/IETR INSA Rennes - 20 av des Buttes de Coësmes - CS 14315 - 35043 RENNES Cedex - France (2) SIRADEL S.A. - 3 allée Adolphe Bobière - CS 24343 - 35043 RENNES Cedex - France
Abstract In this work we study the realisation of a deterministic channel modeling which allows the construction of a realistic received waveform from a wireless Spread Spectrum Multiple-Access (SSMA) using Time Hopping (TH) modulation. The goal is to reach the symbol decision from a simulated waveform. This paper explains how to use the Uniform Theory of Diffraction (UTD) method combined with a ray tracing to obtain the received TH modulation waveform in indoor or outdoor environment.
1 Introduction
This paper presents the various steps allowing the realisation of a deterministic UWB simulator. It provides details about the structural aspects and the simulator timing management.
2
The emitted and received waveforms formulation
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Spread spectrum Multiple-Access (MA) communications using Time Hopping (TH) and binary Pulse Position Modulation (PPM) has recently been proposed in [1], [2], [3] . The signal contains baseband impulses of very short duration (about the nanosecond). Owing to the pulses brevity, the energy of the radio signal is practically spread out from D.C. to a few GHz. [5]) if we choose to not take into account the spatial The advantage is that while reaching a multipath resolufiltering antennas effect. tion close to the nanosecond (roughly 30 cm of resolution) it 5%< is the index of the source. is theoretically possible to partly eliminate fading related to multipath. Therefore the power of emission can be reduced 5%=?> is the number of pulses per symbol. considerably. Because of its very broad band, the radio op5%=?@A 0
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