Results 11 to 20 of about 47,365 (251)
Computers, 2022 This study proposed a two-stage method, which combines a convolutional neural network (CNN) with the continuous wavelet transform (CWT) for multiclass modulation classification. The modulation signals’ time-frequency information was first extracted using
Ahmed Mohammed Abdulkarem +8 more
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IEEE Access, 2021 In order to pursue rapid development of the new generation of wireless communication systems and elevate their security and efficiency, this paper proposes a novel scheme for automatic dual determination of modulation types and signal to noise ratios ...
Tarik Adnan Almohamad +5 more
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Method of 128-position quadrature amplitude-polarization manipulation
Научный вестник МГТУ ГА, 2022 The functioning of modern digital communication systems tends to occur in a complex interference environment. The communication system is affected by various types of jamming: both natural noises associated with the conditions of radio waves propagation,
P. E. Korneev
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Frequency and quadrature amplitude modulation for 5G networks [PDF]
2016 European Conference on Networks and Communications (EuCNC), 2016 The emerging fifth generation (5G) wireless access network, aiming at providing ubiquitous and high data rate connectivity, is envisaged to deploy large number of base stations with higher density and smaller sizes, where inter-cell interference (ICI) becomes a critical problem.
Shangbin Wu +3 more
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A 40–50 GHz RF Front-End with Integrated Local Oscillator Leakage Calibration
Micromachines, 2023 This article presents a transmitter (TX) front-end operating at frequencies covering 40–50 GHz, including a differential quadrature mixer with integrated amplitude and phase imbalance tuning, a power amplifier, and a detection mixer (DM) that supports ...
Peigen Zhou +4 more
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IEEE Photonics Journal, 2014 We experimentally demonstrate a 429.96-Gb/s signal transmission over a 400-km standard single-mode fiber within the 50-GHz grid and successfully achieve spectral efficiency as high as 8.63 bit/s/Hz.
Chao Li +8 more
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Odd-bit triangular quadrature amplitude modulations
2009 IEEE 20th International Symposium on Personal, Indoor and Mobile Radio Communications, 2009 Adaptive modulation is a technique which alters constellation size depending on channel condition to achieve highspeed data transmission. However, the well-known modulation schemes transmitting odd bits per symbol, such as 8-ary phase shift keying (PSK) and cross quadrature amplitude modulation (cross QAM), are generally not considered as a candidate ...
Sung-Joon Park +2 more
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Известия высших учебных заведений России: Радиоэлектроника, 2023 Introduction. An important task faced by the developers of modern telecommunication systems consists in increasing the noise immunity of signal reception in channels with variable parameters.
M. R. Bibarsov +3 more
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IEEE Access, 2021 Opportunistic systems take advantage of the wireless communication channel random behavior, since transmission is made only when fading amplitude is above a threshold value, which is calculated based on a transmission probability.
Nathaly Orozco Garzon +3 more
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Increasing the symbol rate in QAM system using a new set of orthonormal basics functions
Journal of Electrical Systems and Information Technology, 2018 This paper proposes a new technique to increase the symbol rate in Quadrature Amplitude Modulation (QAM) using a new set of orthonormal functions. The proposed technique increases the rate of QAM symbols without increasing the bandwidth of the modulated ...
A.Y. Hassan
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