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Your search keyword '"J. S. Fu"' showing total 3 results
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3 results on '"J. S. Fu"'

2. A portable smart antenna system

Author

Cai Chengjie, Loy Kai Soon, J. S. Fu, and Liew Yew Pheng

Subjects
Beamforming, Engineering, Sensor array, business.industry, Angle of arrival, Smart antenna, Electronic engineering, Direction of arrival, Digital signal, business, Adaptive beamformer, Digital signal processing
Abstract

We have developed a new system to determine the direction of arrival (DOA) of a signal and provide digital beamforming (DBF). The conventional method uses IF signal combiners to perform DOA algorithms and phase shifters to perform beamforming. This method relies on a very complicated RF design which causes the system to be expensive. The paper looks into the use of a general purpose digital signal processor (DSP) and common receivers to perform both the DOA estimation and the DBF algorithms. This is especially useful in enhancing the performance of communication systems which have demodulated in-phase and quadrature signals.

Published
2004
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3. Second- and third-harmonic generation in quasi-periodically domain-inverted Sr/sub 0.6/Ba/sub 0.4/Nb/sub 2/O/sub 6/ single crystal plate

Author

Nai-Ben Ming, Y.Y. Zhu, Rongfu Xiao, George K. Wong, and J. S. Fu

Subjects
Materials science, business.industry, Energy conversion efficiency, Analytical chemistry, Phase (waves), Niobium, chemistry.chemical_element, Second-harmonic generation, Nonlinear optics, Optics, chemistry, Domain (ring theory), business, Single crystal, Pulse-width modulation
Abstract

We have studied the quasi phase matched (QPM) SHG and THG in a quasi-periodically domain inverted SrBaNb/sub 2/O/sub 6/ (SBN) single crystal plate. The conversion efficiency for the SHG and THG is about 10% and 1.6%, respectively.

Published
1998
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