Frequency Effect on UWB Channel Modelling in a Ray-Tracing Based InteraComm Simulator

Asif, Hafiz and Chadwick, Sam and Honary, Bahram and Ahmed, Hassan (2010) Frequency Effect on UWB Channel Modelling in a Ray-Tracing Based InteraComm Simulator. In: 11th Annual PostGraduate Symposium on the Convergence of Telecommunications, Networking and Broadcasting (PGNET 2010). Liverpool John Moores University, GBR. ISBN 978-1-902560-24-3

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The effect of multipath environment in any wireless channel is a difficult task to handle. Fortunately, in case of Ultra-Wide Band (UWB), this is inherently solved to some extent due to its very fine time resolution or extremely wide bandwidth. In this paper, a deterministic channel model was developed based on ray-tracing technique using the art of computer game technology. Both reflection and refraction phenomenon were considered. This work is mainly aimed at incorporating frequency dependent behaviour in the simulator and studying the performance of a UWB channel model over a frequency band of 500MHz and over. If a ray hits a tiny object or corner of the object which size is proportional to the wavelength under consideration, the corresponding frequency was assigned to all the rays in that run of the simulation. The process is repeated for different values of the wavelength by changing the size of the object(s). Our results show that there is little scattering, and hence almost frequency independence behaviour of the channel beyond 3GHz. Moreover, more rays are scattered at relatively lower frequency range (500MHz − 3GHz) but this number (scattered rays) is decreased monotonically with increase in frequency. Moreover, the change in frequency does not affect the channel behaviour a lot. However, it does change the pattern of received rays which will be shown in simulation section. Lastly, the RMS delay and other channel parameters almost remain unchanged.

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18 Dec 2012 15:26
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12 Sep 2023 01:38