Results 201 to 210 of about 47,365 (251)
Some of the next articles are maybe not open access.
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.
Sung-Joon Park
exaly +2 more sources
Quadrature Null Effect in Amplitude Modulation
International Journal of Technology, 2017 Quadrature null effect (QNE) is a phenomenon in amplitude modulation (AM) demodulator circuit arise if carrier signal generated from local oscillator is not synchronized in phase with input signal. Our main motive is to synchronize phase in this effect by various synchronizing techniques so as to reconstruct input modulated signal completely, are ...
Archi Jain, Divanshu Chhabra
openaire +2 more sources
Single sideband quadrature amplitude modulation
Radioelectronics and Communications Systems, 2017 Anew modulation scheme—single sideband quadrature amplitude modulation (SSB QAM) is proposed. This scheme allows to decrease the spectral width of the transferred signal by two times as opposed to the traditional quadrature amplitude modulation, while maintaining its spectral efficiency.
Александр Борисович Коханов
openaire +3 more sources
Parallel-coupled dual racetrack silicon micro-resonators for quadrature amplitude modulation
Optics Express, 2011 Duo Ding, David Z Pan, Wei Jiang
exaly +2 more sources
Weighted-Quadrature-Amplitude Modulation
IEEE Transactions on Electromagnetic Compatibility, 1986A family of weighted-quadrature-amplitude-modulation (WQAM) schemes is introduced and analyzed. One of the staggered WQAM (SWQAM) schemes has low spectral sidelobes, even after hardlimiting, and its performance in an adjacent-channel interference (ACI) environment is superior to that of the QPSK; SQPSK, MSK, and SQORC.
Andy D. Kucar, Kamilo Feher
openaire +1 more source
On the blind classification of parametric quadrature amplitude modulations
2016 3rd International Conference on Advances in Computational Tools for Engineering Applications (ACTEA), 2016Automatic modulation classification (MC) for parametric quadrature amplitude modulation (QAM) formats is investigated. The generic θ-QAM is considered, which includes popular constellations, such as square QAM (SQAM) and triangular QAM (TQAM). Both feature-based and optimal likelihood-based classifiers are tested, where in the first we use high order ...
Hadi Sarieddeen, Zaher Dawy
openaire +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