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A novel ultra-short InP-based 1.31/1.55-µm wavelength demutiplexer, whose MMI section is only one beat length of the two guided modes, is demonstrated. The measured extinction ratios for 1.3/1.55-µm bands exceed 20/15 dB, respectively.
Cognitive Radio (CR) which aims to improve the spectrum utilization by accessing opportunistically the spectrum originally licensed to a primary system is a promising concept. OFDM is regarded as a potential technology for CR systems and dynamic resource allocation is an important task in such systems. This paper focuses on the sub carrier and power allocation algorithms which are to maximize secondary...
Fourier Telescopy (FT) is an active high-resolution imaging technique. In the laboratory, the interference fringes which are essential to spectrum extraction are obtained by changing the position of beams. The theory about spectrum extraction is introduced in this paper, and iterative algorithm of restoring the target spectrum is presented also. A novel method of beam-moving is proposed, and has been...
Summary form only given. Along with the aggressive development of the wireless local area network (WLAN) and cellular network, the integrated advantage of these two networks has become an inevitable development in the future. This research is based on the official reports of the GSM-WLAN project hold by NICI (National Information and Communications Initiative Committee) and attempts to observe the...
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