KEYWORDS: Telecommunications, Local area networks, Network architectures, Field programmable gate arrays, Mobile communications, Intelligence systems, Standards development, Wireless broadband, Communication and information technologies, Information technology
R&D on new generation mobile network has attracted a growing interest over the
world on the background of rapid market growth for 2nd and 3rd - generation cellular
networks and wireless LANs/MANs. The National Institute of Information and
Communications Technology (NICT) has been carried out the New Generation Mobile
Network Project from April 2002 to March 2006, and has developed fundamental
technologies to enable seamless and secure integration of various wireless access
networks such as existing cellular networks, wireless LANs, home networks, intelligent
transport systems (ITS), the Beyond-3G (B3G) cellular and other wireless access
systems. From April 2006, Ubiquitous Mobile Network project focused on cognitive
radio technology and integrated seamless networking technology was started. This
paper overviews the achievement and the future plan of these projects.
A free space coupled intensity modulator is designed at 20GHz. Slot antennas are printed on LINbO3 substrate and are individually connected to short length of electrodes, intensity modulation occurs by radiation coupling. Measurement of a different pattern of slot antennas are given, it is suggested to couple linear slot antennas in order to increase the bandwidth. Characterization of three designs of intensity modulators are presented.
An advanced optically controlled multiple beam forming and steering network for an active phased array antenna is proposed in this paper. Simultaneous multiple beam forming and steering can be achieved by optical-frequency multiplexing and optical microwave control. The proposed active phased array antenna system also has the capability of frequency re-use and the co-use of active array elements.
The use of fiber optic (F.O.) systems has flourished with the advent of high quality and reliable low-loss fiber and opto-electronic devices such as semiconductor lasers and photodiodes. Moreover, extension of F.O. communication into the microwave and millimeter wave frequencies has been of particular interest because of system miniaturization and the potential of low-loss bandwidth available. With the diversity of F.O. systems now being designed and deployed, it has become increasingly difficult to classify and evaluate the various microwave and millimeter wave link architectures. This paper summarizes and reviews twelve F.O. link architectures with respect to design, performance and high-frequency potential.
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