Results 211 to 220 of about 163,290 (264)
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Concatenated codes using coded modulation with a phase shift
2012 18th Asia-Pacific Conference on Communications (APCC), 2012A new coded modulation with a phase shift is proposed. The parity bits decide how to shift the signal constellation point of information bits in the transmitter. In the receiver, the phase shift detector estimates how much the constellation points are shifted and then recovers the parity bit.
Mämmelä, Aarne, Kim, Haesik
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Phase shifting mask modulated laser patterning on graphene
Nanotechnology, 2016A one-step graphene patterning method is developed in this paper. A phase shifting mask is used to modulate incident laser beam spatially and generate graphene patterns by laser heating. Periodic graphene nanoribbon and nanomesh structures are fabricated by employing 1D and 2D phase shifting masks, respectively.
Gao, F. +10 more
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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
Deborah van Alphen, William C. Lindsey
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An evaluation of phase-shift analysis of modulated photocurrents
Philosophical Magazine B, 1990Abstract The accuracy and limitations of phase-shift analysis of modulated photocurrents as a means of determining the energy profile of localized states in amorphous semiconductors have been investigated. The basis of the existing ‘recursion procedure’ is reviewed and its deficiencies are revealed by applying the method to computer-generated phase ...
Bruggemann, R. +3 more
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Hyper Phase Shift Keying (HPSK) Modulation
2007 Conference Record of the Forty-First Asilomar Conference on Signals, Systems and Computers, 2007A new modulation technique that uses four orthonormal basis functions is proposed. Using four orthonormal basis functions provides an advantage over most traditional modulation techniques such as quadrature phase shift keying and quadrature amplitude modulation that only possess two degrees of freedom.
James Caldwell, Murali Tummala
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Phase-shifted linear partial-response modulation
Proceedings of 1995 IEEE International Symposium on Information Theory, 2002Partial-response modulations are widely used for spectrum shaping and bandwidth reduction. Linear partial-response signaling (PRS) is a well-known form of linear coded modulation which was proposed by Lender (1963). Due to the lack of efficient algorithms for maximum likelihood detection the research on the subject concentrated on the simplest forms of
A. Said, J.B. Anderson
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94 GHz phase-shift-keying modulator
International Journal of Infrared and Millimeter Waves, 1996This paper describes a kind of low insertion loss phase-shift-keying modulators used in 94GHz digital communications systems. A BPSK modulator with a insertion loss lower than 3.8dB has been achieved by connecting a circulator and a fin-line PIN diode phase shifter in series. The bandwidth is 2.5GHz given a phase error of ±50.
Liquan He, Fei Hong, Yong Li
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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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Phase-shift-locked interferometer with a wavelength-modulated laser diode
Applied Optics, 2003A phase-shift-locked interferometer has been constructed for distance measurement. A phase shift produced by sawtooth-current modulation of a laser diode is locked to a phase difference preset by polarization optics that consists of a quarter-wave plate and polarizers through an electrical feedback technique.
Ribun, Onodera, Yukihiro, Ishii
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Phase-shifting laser diode interferometer using pulse modulation
Applied Optics, 2012A phase-shifting laser diode interferometer that uses direct pulse modulation is proposed and demonstrated. We found that a laser beam with a wide range of wavelength variation at constant optical power could be generated when a pulsed current was injected into the laser diode.
Takamasa, Suzuki +3 more
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