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: Transceiver Design Concept for Cellular and Multispot Diffusing Regimes of Transmission | EURASIP Journal on Applied Signal Processing 2005 1 30-38 2005 Hindawi Publishing Corporation Transceiver Design Concept for Cellular and Multispot Diffusing Regimes of Transmission S. Jivkova Central Laboratory of Optical Storage and Processing of Information Bulgarian Academy of Sciences 1113 Sofia Bulgaria Email sjivkova@ M. Kavehrad Center for Information and Communications Technology Research CICTR Department of Electrical Engineering The Pennsylvania State University University Park PA 16802 USA Email mkavehrad@ Received 25 March 2004 Revised 23 August 2004 A number of attempts have been made in an effort to combine the advantages of line-of-sight and diffuse configurations for indoor optical wireless communications via sophisticated combinations of elements that are characteristic for these architectures. A different approach has been followed in the present investigation namely developing a transceiver capable of operating in both configurations. It is proposed that the transceiver design be based on the utilization of two-dimensional arrays of infrared lightemitting devices and photodetectors. Basic design parameters of transceiver optics are derived from considerations about link blockage and system compliance with the unique features of line-of-sight and diffuse methods of transmission. Keywords and phrases optical communications wireless communications local area networks. 1. INTRODUCTION It has been more than two decades now since Gfeller and Bapst 1 suggested that diffusely scattered infrared light could be utilized as a medium for wireless communications indoors. Various system configurations for optical wireless local area networks have been investigated since then. They differ in the degree of directionality of the transmitter and receiver and the orientation of the units. The latter factor underlies the development of two major classes of link topology line-of-sight LOS links in which an LOS path between receiver and .
