Optical wireless communication systems

The emerging field of optical wireless communication (OWC) systems is seen as potential complementary technology to the radio frequency wireless communications in certain applications. It is deemed as a possible technology in the future 5th Generation communication networks to address the spectrum congestion and improve the system's capacity. More research and developments in OWC is still needed in order for it to be adopted in current and future communication systems. This special issue brings together research papers on OWC covering free space optic, visible communications and ultraviolet communications

Proceedings of the Second International Mobile Satellite Conference (IMSC 1990)

Presented here are the proceedings of the Second International Mobile Satellite Conference (IMSC), held June 17-20, 1990 in Ottawa, Canada. Topics covered include future mobile satellite communications concepts, aeronautical applications, modulation and coding, propagation and experimental systems, mobile terminal equipment, network architecture and control, regulatory and policy considerations, vehicle antennas, and speech compression

Proceedings of the Mobile Satellite Conference

A satellite-based mobile communications system provides voice and data communications to mobile users over a vast geographic area. The technical and service characteristics of mobile satellite systems (MSSs) are presented and form an in-depth view of the current MSS status at the system and subsystem levels. Major emphasis is placed on developments, current and future, in the following critical MSS technology areas: vehicle antennas, networking, modulation and coding, speech compression, channel characterization, space segment technology and MSS experiments. Also, the mobile satellite communications needs of government agencies are addressed, as is the MSS potential to fulfill them

The DEMETER Program: A Pathfinder to a High Performance Micro Satellite Line

The DEMETER satellite is scheduled for launch in early 2004, from Baikonour, aboard a Dnepr launcher. Its main scientific objectives are the detection and characterization of ionospheric electrical and magnetic disturbances in connection with a telluric activity. The DEMETER program is the first application of the MYRIADE program conducted by CNES, in partnership with the two leading European space companies ASTRIUM and ALCATEL SPACE. The joint effort is directed to the definition of a product able to implement either scientific missions, demonstrators or operational applications in different areas: earth observation, astronomy, fundamental physics, or telecommunications, within limited financial budget. These various missions led to the design of a system with a very high level of performances in terms of power, AOCS, propulsion, data storage and transmission, robustness and availability as well as flexibility. Capacity to implement technological innovations is also a cornerstone of MYRIADE endeavor. Beyond DEMETER, 3 other missions representing 6 additional satellites are today fully funded and under development for launch in 2004 and further. The paper will introduce DEMETER and the other different missions under development or analysis. It will then focus on the description of the performances offered, which appear to be unique for this size of spacecraft, the design and the validation process. The organization set for the development will finally be presented as well as the progress status

NASA Tech Briefs, January 1990

Topics include: Electronic Components and Circuits. Electronic Systems, Physical Sciences, Materials, Computer Programs, Mechanics, Machinery, Fabrication Technology, Mathematics and Information Sciences, and Life Science

Publications of the Jet Propulsion Laboratory, 1985

This bibliography describes and indexes by primary author the externally distributed technical reporting, released during calender year 1985, that resulted from scientific and engineering work performed, or managed, by the Jet Propulsion Laboratory. Three classes of publications are included: JPL publications in which the information is complete for a specific accomplisment; Articles from the quarterly Telecommunications and Data Acquisition (TDA) Progress Report; and article published in the open literature