Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article Polarization Behavior of Discrete Multipath and Diffuse Scattering in Urban Environments | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2007 Article ID 57980 16 pages doi 2007 57980 Research Article Polarization Behavior of Discrete Multipath and Diffuse Scattering in Urban Environments at GHz Markus Landmann 1 Kriangsak Sivasondhivat 2 Jun-Ichi Takada 2 Ichirou Ida 3 and Reiner Thoma1 1 Electronic Measurment Research Lab Institute of Information Technology Ilmenau University of Technology . Box 100 565 98684 Ilmenau Germany 2 Department of International Development Engineering Takada Laboratory Graduate School of Engineering Tokyo Institute of Technology Tokyo 152-8552 Japan 3 Fujitsu Limited Tokyo 105-7123 Japan Received 13 April 2006 Revised 7 November 2006 Accepted 15 November 2006 Recommended by Rodney A. Kennedy The polarization behavior of the mobile MIMO radio channel is analyzed from polarimetric double-directional channel measurements which were performed in a macrocell rural environment in Tokyo. The recorded data comprise non-line-of-sight obstructed line-of-sight and line-of-sight conditions. The gradient-based maximum-likelihood estimation framework RIMAX was used to estimate both specular and dense multipath components. Joint angular-delay results are gained only for the specular components. The dense multipath components which may be attributed to diffuse scattering can be characterized only in delay domain. Different characteristics describing the polarization behavior and power-weighted cross- and copolarization ratios for both types of components are introduced. Statistical analysis of long measurement track segments indicates global trends whereas local analysis emphasizes specific behavior such as polarization dependency on angle of incidence in streets and under shadowing conditions. The results also underline the importance of modeling changing and transient propagation scenarios which are currently not common in available MIMO channel models. Copyright 2007 Markus .
