Results 221 to 230 of about 145,584 (294)
Some of the next articles are maybe not open access.
Journal of Lightwave Technology
A quantum noise stream cipher scheme (QNSC) based on triangular quadrature amplitude modulation (TQAM) and the secret probabilistic shaping (SPS) is studied.
Kongni Zhu +6 more
semanticscholar +1 more source
A quantum noise stream cipher scheme (QNSC) based on triangular quadrature amplitude modulation (TQAM) and the secret probabilistic shaping (SPS) is studied.
Kongni Zhu +6 more
semanticscholar +1 more source
Polarized light by quadrature amplitude modulation
Optics and Lasers in Engineering, 2013Abstract A new method to create elliptically polarized light based on the quadrature amplitude modulation is proposed. This method begins from an unpolarized light and does not use any classical methods, as for instance those using polarizers and retarders or also by refraction, scattering, dichroism or birefringence effects.
Cruz Meneses-Fabian, Uriel Rivera-Ortega
openaire +2 more sources
Flexible Quadrature Spatial Pulse Amplitude Modulation for VLC Systems
IEEE Systems Journal, 2022Quadrature-spatial modulation (QSM) offers high spectral efficiency (SE) without interchannel interference for both radio frequency and visible light communication (VLC) systems. In this article, a new QSM scheme called flexible quadrature spatial pulse amplitude modulation (FQSPAM) is proposed for VLC systems.
Yasin Celik +2 more
openaire +3 more sources
Triangular Quadrature Amplitude Modulation
IEEE Communications Letters, 2007The square quadrature amplitude modulation (QAM) has been widely used for decades. Though it is not optimum in the sense of power efficiency, simple detection makes it in use for numerous digital communication systems deploying high-order modulation. In this paper, we propose new signal sets which make an effective use of limited power resource.
openaire +1 more source
A Novel Ternary Quadrature Amplitude Modulation
2006 2nd International Conference on Information & Communication Technologies, 2006We propose TQAM (ternary quadrature-amplitude modulation) as a scheme of modulating analog signals to carry ternary digital data. We propose a model for the constellation diagram of the new scheme. Our motivation of thinking about this issue is the fact that the application of multi-value (non-binary) digital signals can provide considerable relief of ...
A.M. Haidar, R. Dernaika, F. Shibani
openaire +1 more source
Efficient implementation of quadrature amplitude modulation transmitters
Proceedings. IEEE International Multi Topic Conference, 2001. IEEE INMIC 2001. Technology for the 21st Century., 2005Quadrature amplitude modulation (QAM) is widely used in many digital communication systems such as high speed modems. Increasing the data rate by using larger constellations has brought a revolution in digital communication systems. Consequently, there is a need for efficient techniques of implementation of QAM, both in software and the hardware.
F.M. Kashif, W. Qadeer, S.I. Shah
openaire +1 more source
Differential Encoding for Quadrature-Amplitude Modulation
2010 IEEE 71st Vehicular Technology Conference, 2010In this paper, we propose a novel differential encoder for QAM (quadrature-amplitude modulation), by a look-up table instead of a rule. Using a table for differential encoding has the advantages of both low complexity and good error performance. We propose algorithms to construct the table for maximizing the minimum noncoherent distance and minimizing ...
openaire +1 more source
Synchrophasor measurement method based on quadrature amplitude modulation
2018 26th Signal Processing and Communications Applications Conference (SIU), 2018Synchrohasor measurement is a common tool to monitor system stability and detect faults in electric power systems and various Phasor Measurement Units (PMUs) have been developed for this purpose. Parameter computation methods of PMUs specifically designed for rapidly time-varying voltage cases caused by nonlinear dynamic loads have been an attractive ...
Ali Gökoğlu +2 more
openaire +2 more sources
Radio-Over-Fibre Broadband Quadrature Amplitude Modulator
2006 European Conference on Optical Communications, 2006A highly-scalable photonic quadrature amplitude modulation architecture based on vector summation and dispersive delay lines, which can generate QAM signals directly from parallel digital words is proposed and experimentally demonstrated by generating a 3 Gbps?8QAM?39 GHz modulated carrier.
M. A. Piqueras +5 more
openaire +1 more source
Generation of pure electrical quadrature amplitude modulation with photonic vector modulator
Optics Letters, 2008A photonic vector modulator architecture for generating pure quadrature amplitude modulation (QAM) signals is presented. An electrical quadrature-modulated signal at microwave-millimeter-wave frequencies is generated from its corresponding baseband in-phase (I) and quadrature (Q) components.
Juan L, Corral +3 more
openaire +2 more sources