散射環(huán)境變化的室內(nèi)時變TR-UWB信道特性研究
[Abstract]:Time inversion (Time Reversal,TR) technology can realize time and space synchronous focusing of ultra-wideband (Ultrawideband,UWB) electromagnetic signals, which can simplify the complexity of receiver, reduce transmission power, reduce inter-symbol interference and improve signal-to-noise ratio (SNR). With the increasing demand for high quality wireless communication, time inversion ultra-wideband (TR-UWB) communication technology is expected to become one of the key technologies in future wireless communication, so the research on it is becoming more and more active. The study of TR-UWB electromagnetic channel characteristics and further establishment of channel model has become an important research content of TR-UWB communication. At present, most of the researches on TR-UWB, are non-time-varying, but for practical wireless communication systems, time-varying wireless communication environment is the most common case, so the study of TR-UWB in time-varying environment is particularly important. The study of TR-UWB, in time-varying environment should begin with its channel characteristics and find out its regularity. Secondly, by studying these characteristics and combining with the general spatio-temporal focusing model of TR-UWB under time-invariant condition, we can find out a TR-UWB channel model which is more suitable for time-varying environment as far as possible. In this paper, the electromagnetic simulation platform based on finite-difference time-domain method (Finite Difference Time Domain,FDTD) is used to study the characteristics of TR-UWB channel in indoor time-varying environment. Firstly, based on the two electromagnetic simulation platforms developed by the team, the platform is screened, and the simulation platform with higher simulation accuracy and efficiency is selected to study the channel characteristics. Then, using the selected simulation platform, the propagation characteristics (including focusing characteristics) of indoor time-varying TR-UWB electromagnetic wave in the case of scatterer moving are studied, and some valuable research results are obtained. The thesis is divided into five chapters. The main contents are as follows: the first chapter introduces the background and significance of the research, the current research status of TR-UWB channel characteristics and the main research content of this paper. The second chapter introduces the simulation principle and tools, and gives the choice of simulation platform and the test of accuracy and efficiency. In chapter 3, the channel characteristic parameters are introduced, including time compression ratio, focus gain, spatial correlation coefficient, simulation environment layout and simulation steps. In chapter 4, the channel parameters of the target point and the observation point in the simulation space are extracted, and the variation trend of the channel parameters is analyzed and the rules are summarized. The channel parameters of the target point and the surrounding observation points are analyzed and compared, and some valuable conclusions are obtained. The last chapter summarizes the work of the thesis and looks forward to the future work.
【學位授予單位】:電子科技大學
【學位級別】:碩士
【學位授予年份】:2014
【分類號】:TN925
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