Results 21 to 30 of about 191,818 (262)
IEEE Access, 2020 The achievement of the boundary values of spectral efficiency is associated with the development of methods for generating and receiving signals with a compact spectrum. The reason is a constant increase in the capacity of existing communication channels
Sergey B. Makarov +6 more
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Spectral efficiency of blackness induction [PDF]
Journal of the Optical Society of America A, 1984 The spectral efficiency of blackness induction was measured in three normal trichromatic observers and in one deuteranomalous observer. The psychophysical task was to adjust the radiance of a monochromatic 60-120' annulus until a 45' central broadband field just turned black and its contour became indiscriminable from a dark surrounding gap that ...
Werner, John S +3 more
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IEEE Access, 2022 Ultra densification of the number of antennas combined with the use of large bandwidths in the millimeter wave (mmWave) spectrum is considered one of the main methodologies to achieve the quality of service requirements for future generations of wireless
P. Higo Thaian da Silva +4 more
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Sensors, 2023 Non-Orthogonal Multiple Access (NOMA) has become a promising evolution with the emergence of fifth-generation (5G) and Beyond-5G (B5G) rollouts. The potentials of NOMA are to increase the number of users, the system’s capacity, massive connectivity, and ...
Syed Agha Hassnain Mohsan +5 more
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Generalized Model for Spectral Efficiency of Cellular Systems
The Journal of Engineering Research, 2006 A general mathematical model was used to study the spectral efficiency of cellular systems. The model took into consideration effects of first and second tier interference.
A.M. Abbosh
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NOMA-Based VLC Systems: A Comprehensive Review
Sensors, 2023 The enhanced proliferation of connected entities needs a deployment of innovative technologies for the next generation wireless networks. One of the critical concerns, however, is the spectrum scarcity, due to the unprecedented broadcast penetration rate
Syed Agha Hassnain Mohsan +5 more
doaj +1 more source
Spectral efficiency of energy efficient multicarrier systems [PDF]
ACM SIGMETRICS Performance Evaluation Review, 2014 We investigate the achievable performances of multi-carrier energy efficient power control game. Both the simultaneous-move and the hierarchical games are addressed. For the first time, we derive analytical closed-form expressions of the spectrum coordination and the spectral efficiency of such models.
Haddad, Majed +3 more
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Binary CPMs With Improved Spectral Efficiency [PDF]
IEEE Communications Letters, 2016 We design new continuous phase modulation (CPM) formats which are based on the combination of a proper precoder with binary input and a ternary CPM. The proposed precoder constrains the signal phase evolution in order to increase the minimum Euclidean distance, and to limit the bandwidth expansion due to the use of a ternary CPM.
Messai, Malek +4 more
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Spectrally-Efficient Continuous Phase Modulations [PDF]
2008 IEEE International Symposium on Information Theory, 2008 We investigate the spectral efficiency of continuous phase modulations (CPMs). To this end, we need an effective bandwidth definition for a CPM signal, whose power spectral density has in principle an infinite support. The definition we adopt is based on the spacing between adjacent carriers in a frequency division multiplexed CPM system.
Alan Barbieri +2 more
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Spectral efficiency of spectrum-pooling systems [PDF]
IET Communications, 2008 In this contribution, we investigate the idea of using cognitive radio to reuse locally unused spectrum to increase the total system capacity. We consider a multiband/wideband system in which the primary and cognitive users wish to communicate to different receivers, subject to mutual interference and assume that each user knows only his channel and ...
Majed Haddad +2 more
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