Based On The Electromagnetic Simulation Of The Tr-uwb Indoor Channel Model

Ultra-wideband (UWB) communication systems are typically operating in complex electromagnetic environments. As a result, the performance of UWB communications, such as high-speed and large capacity will be influenced significantly by severe multipath effects. Time reversal (TR) technique can make use of multipath effects to achieve temporal and spatial focusing simultaneously at the target point, consequently, TR-UWB communication technology can suppress the communication interference which is encountered by conventional UWB communications, and then have the great potential to improve the performance of communication systems. In order to develop effective and reliable TR-UWB wireless communication systems, it is essential to understand the TR-UWB signal propagation properties, research the equivalent channel characteristics, and ultimately construct a reasonable TR-UWB channel model.A number of line-of-sight and non line-of-sight indoor environments, with the distances between transmitter and receiver being from 0 to 10m, constructed on the simulation platform, are introduced firstly in this thesis. Next, the basic principles and methods for the simulation of TR-UWB equivalent channel are presented. After that, the processing of simulated data, especially the key algorithm to extract channel impulse response-CLEAN algorithm, are given, and the channel simulation results are analyzed as well.Secondly, the TR-UWB equivalent channel characteristics are investigated compared with the traditional ultra-wideband channel, such as the path loss, multipath component distribution, and power profile. The methods for the extraction of TR-UWB channel characteristic parameters, such as, root-mean-square (RMS) delay spread, mean excess delay, and number of multipath components, are presented.Next, based on the simulation environments constructed in this thesis, some parameters for the IEEE 802.15.3a UWB channel model are extracted to verify the channel model and the simulation platform as well. And then, some typical characteristics of TR-UWB equivalent channel, such as the variation of major multipath component intensity with the transmitter and receiver distance, are investigated. Conclusions of the research work and directions for future research are given at last.