07-05-2014, 04:01 PM
UWB Propagation Channel Modelling
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Abstract:
This paper mainly describes modelling of IEEE 802.15.3a standard UWB
propagation channel in MATLAB. A performance analysis and comparison of the
UWB propagation channel in four different environments are given, based on
simulations in both MATLAB and ADS.
Introduction
Ultra-Wideband (UWB) is a fast emerging technology. The UWB signal can be
transmitted through the wide spectrum band (3.1-10.6GHz). UWB supports high
speed data rates up to 448Mbps, based on ultra-short (nanosecond scale) waveforms.
This narrow pulse feature causes new effects on UWB propagation channel.
Comparing to “conventional” wireless channel, the very large bandwidth of the UWB
impulse based signal results in a high number of multipath components and in
non-Rayleigh fading.
UWB Propagation Channel
The modified Saleh-Valenzuela (S-V) model was adopted as a reference UWB
channel model by the IEEE 802.15.3 in 2003 [2]. The modelling of UWB channels is
based on the measurement of indoor propagation environment, as the main
commercial applications will be indoor communications. The main distinguishing
features of UWB propagation channel are its extremely multipath-rich profile and
non-Rayleigh fading amplitude characteristics.
Conclusions and Future Work
Based on the Direct Sequence UWB (DS-UWB) system, we modeled and simulated
the UWB propagation channel in both MATLAB and ADS. The delay profile figures
from MATLAB illustrate the impulse response of the modified S-V channel and
difference between four measurement environments. The BER vs. Eb/No plots further
show the performance of the four modified S-V channels clearly. The models
developed in MATLAB and ADS may be used for further studies of UWB systems.