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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 An Analytical Modeling of Polarized Time-Variant On-Body Propagation Channels with Dynamic Body Scattering | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2011 Article ID 362521 12 pages doi 10.1155 2011 362521 Research Article An Analytical Modeling of Polarized Time-Variant On-Body Propagation Channels with Dynamic Body Scattering Lingfeng Liu 1 2 Farshad Keshmiri 1 Christophe Craeye 1 Philippe De Doncker 2 and Claude Oestges1 1ICTEAM Electrical Engineering Universite Catholique de Louvain 3 Place du Levant 1348 Louvain-la-Neuve Belgium 2 OPERA Department Universite Libre de Bruxelles CP 194 5 Avenue F. D. Roosevelt 50 1050 Bruxelles Belgium Correspondence should be addressed to Lingfeng Liu lingfeng.liu@uclouvain.be Received 5 October 2010 Accepted 13 January 2011 Academic Editor Dries Neirynck Copyright 2011 Lingfeng Liu et al. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. On-body propagation is one of the dominant propagation mechanisms in wireless body area networks WBANs . It is characterized by near-field body-coupling and strong body-scattering effects. The temporal and spatial properties of on-body channels are jointly affected by the antenna polarization the body posture and the body motion. Analysis on the time variant properties of on-body channels relies on a good understanding of the dynamic body scattering which is highly dependent on specific scenarios. In this paper we develop an analytical model to provide a canonical description of on-body channels in both time and space domains to investigate the on-body propagation over the trunk surface of a walking human. The scattering from the arms and the trunk in different dimensions is considered with a simplified geometrical description of the body and of the body movements during the walk. A general full-wave solution of a polarized point source with multiple cylinder scattering is derived and .
