Results 261 to 270 of about 504,913 (304)
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Higher-order differential phase shift keyed modulation
IEEE Transactions on Communications, 1994Advanced modulation/demodulation techniques which are robust in the presence of phase and frequency uncertainties continue to be of interest to communication engineers. The authors are particularly interested in techniques which accommodate slow channel phase and frequency variations with minimal performance degradation and which alleviate the need for
D.K. van Alphen, W.C. Lindsey
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Reactance Tube Modulation of Phase Shift Oscillators
Bell System Technical Journal, 1949This paper describes a basic circuit for reactance tube modulation of phase shift oscillators. The design of suitable phase shift oscillators for frequencies from audio through the ultra-high frequencies is discussed. Experimental performance data derived from several types of frequency modulated phase shift oscillators are presented.
F. R. Dennis, E. P. Felch
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Modulation analysis of phase-shifted holographic interferograms
Optics Communications, 1994Abstract A new evaluation technique for phase-shifted holographic interferograms is developed and verified by experiments. In evaluating the interferograms, both the discrete phase distribution and the intensity modulation of interference fringes are calculated and a binary control mask is generated by analysing histograms and tracing local minima of
X.-Y. Su, A.M. Zarubin, G. von Bally
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Experimental demonstration of microring quadrature phase-shift keying modulators
Optics Letters, 2012Advanced optical modulation formats are a key technology to increase the capacity of optical communication networks. Mach-Zehnder modulators are typically used to generate various modulation formats. Here, we report the first experimental demonstration of quadrature phase-shift keying (QPSK) modulation using compact microring modulators.
Po, Dong +4 more
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Small-Signal Modeling of Uniformly Sampled Phase-Shift Modulators
IEEE Transactions on Power Electronics, 2014Phase shift modulation (PSM) is a commonly used technique for controlling the active power flow in resonant dc-ac and dc-dc converters. Although traditionally developed as an analog modulation scheme, digital PSM is being increasingly used in conjunction with advanced multi-variable digital controllers and online efficiency optimization algorithms ...
SCANDOLA, LUCA +2 more
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Giant terahertz magnetoelastic phase-shift modulator
Applied Physics ReviewsDevelopments in communication technologies depend on the parallel progress in materials innovation, data processing devices, and their strategic integration. Terahertz (THz) science and technology is the latest field to witness phenomenal growth in 6G communication and quantum materials devices.
Ayyappan Shyam +9 more
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Phase shifting interferometry by modulation of the electric field module
SPIE Proceedings, 2011A new method for phase-shifting interferometry based on the wave amplitude modulation is proposed and discussed. This proposal is based on the interference of three waves, where two waves attend as two reference waves and the other wave attends as a probe wave.
Cruz Meneses-Fabian, Uriel Rivera-Ortega
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Phase-locked phase-shifting laser diode interferometer with photothermal modulation
Applied Optics, 2000We propose a phase-shifting interferometer that uses both phase-locked and photothermal modulating techniques. In this interferometer the measurement accuracy is not affected by the intensity modulation that usually appears in current modulation. The surface profile of a diamond-turned aluminum disk was measured; the rms repeatability obtained was ...
T, Suzuki, X, Zhao, O, Sasaki
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Differential phase shift keying modulation for WIN systems
TENCON'92 - Technology Enabling Tomorrow, 2003Experimental results on indoor microwave data communication using differential phase shift keying (DPSK) to implement wireless in-building network (WIN) systems are presented. The unique characteristics of this wireless medium are reported, with emphasis on multipath problems and spasmodic links of the radio channel which distinguishes WIN from wired ...
S. Rahardja, L.C. Look, D.M. Anh
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Spatial light modulator-based phase-shifting Gabor holography
SPIE Proceedings, 2012We present a modified Gabor-like setup able to recover the complex amplitude distribution of the object wavefront from a set of in-line recorded holograms. The proposed configuration is characterized by the insertion of a condenser lens and a spatial light modulator (SLM) into the classical Gabor configuration.
Vicente Micó +3 more
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