Measurement And Simulation Of Interior Broadband Wireless Channel

Broadband wireless communication has become a focus of the new round of competition of technology and industry in the world. The next decade will be a key period for the development of broadband wireless technology. With the surging in the number of users and the emerging of video telephony, video download, and other new businesses, the transmission capacity of existing communication system seems can not do anything. So the construction of broadband wireless communication system is imperative. The design and optimization of broadband wireless communication system can be carried out based on the research of broadband wireless cannel characteristics. A reliable channel model is the prerequisite and guarantee of a good wireless communication system. Based on the electromagnetic theory and statistical theory, the studies on broadband wireless propagation characteristics of the indoor typical scenarios are performed using the time-domain measurement method and the Finite Difference Time Domain (FDTD) simulation method. The main work is summarized as follows:1. In Chapter Ⅰ, the prospects for the development of wireless communications are introduced, and the significance and necessity of researches on indoor broadband radio channel propagation characteristics based on the typical environment in China are given.2. In Chapter Ⅱ, firstly, the indoor wireless channel model and indoor wireless channel research methods are introduced. Next, two methods of experimental measurement and electromagnetic simulation are compared. In addition, the theory of FDTD is described in detail.3. In Chapter Ⅲ, broadband radio channel measurements are performed, with the time-domain measurement method, in a lab of the University of Electronic Science and Technology. With reference to the lab environment, four kinds of typical indoor scenarios (Poor scattering Line-of-Sight, Poor scattering Non-Line-of-Sight, Rich scattering Line-of-Sight, and Rich scattering Non-Line-of-Sight) are planned and simulated on the FDTD simulation platform. 4. In Chapter Ⅳ, by using the CLEAN algorithm, the channel impulse response is extracted. Based on the statistical knowledge, the statistical models, including path loss model, power delay profile, mean excess delay, RMS delay spread, multipath number and other important information of the four simulation indoor scenarios, are given. And then, the results of channel experiments are briefly given, and compared with those obtained from electromagnetic simulation.5. In Chapter Ⅴ, based on the researches on the wireless channel of above scenarios, the channel models for different indoor scenarios are found quite different. It makes difficult for the indoor channel model to have a uniform standard. Consequently, the effects of the internal wall on the indoor wireless propagation characteristics are studied by simulation, and some important information has been given.6. In Chapter Ⅵ, conclusion of the work is given, and several future research directions are put forward.