Results 1 to 10 of about 4,229 (154)
Modulator-free quadrature amplitude modulation signal synthesis. [PDF]
Nat Commun, 2014 AbstractThe ability to generate high-speed on–off-keyed telecommunication signals by directly modulating a semiconductor laser’s drive current was one of the most exciting prospective applications of the nascent field of laser technology throughout the 1960s.
Liu Z +6 more
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Digital Demodulator of the Quadrature Amplitude Modulation Signals [PDF]
Measurement Science Review, 2018 In this paper, the digital algorithm and the device for the demodulation of the quadrature amplitude modulation signals are considered. The fundamental advantages of our approach are simple hardware implementation, minimal number of arithmetic operations
Chernoyarov Oleg +4 more
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Integrating fixed and mobile coherent optical access networks for unified broadband services [PDF]
Communications EngineeringThe integration of fixed and mobile optical access networks can enhance resource utilization, reduce network complexity, and lower deployment costs.
Qi Wu +10 more
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IEEE Photonics Journal, 2013 We propose a novel method of compensation for imbalance between in-phase (I) and quadrature (Q) channels in the front-end circuit of digital coherent optical receivers.
Md. Saifuddin Faruk, Kazuro Kikuchi
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Amplify–Quantize–Forward Relay Channel With Quadrature Amplitude Modulation
IEEE Access, 2022 This paper considers an amplify–quantize–forward (AQF) relay channel with $M$ -ary quadrature amplitude modulation, where the relay implements a uniform quantization for the amplified received signal and forwards it to the destination. Two
Xianglan Jin
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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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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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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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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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