Results 11 to 20 of about 145,584 (294)
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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Parallel Mach-Zehnder modulators for quadrature amplitude modulation
IEICE Electronics Express, 2011 This paper describes optical quadrature amplitude modulation techniques using parallel Mach-Zehnder modulators (MZMs). Arbitrary constellations of optical signals can be generated by using a dual-parallel MZM which can independently control real and imaginary components of lightwaves, where each MZM should be driven by multi-level electric signals ...
T. Kawanishi
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Parallel-coupled dual racetrack silicon micro-resonators for quadrature amplitude modulation
Optics Express, 2011 A parallel-coupled dual racetrack silicon micro-resonator structure is proposed and analyzed for M-ary quadrature amplitude modulation. The over-coupled, critically coupled, and under-coupled scenarios are systematically studied.
Ryan A. Integlia +5 more
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Quadrature Amplitude Modulation: From Basics to Adaptive Trellis-Coded, Turbo-Equalised and Space-Time Coded OFDM, CDMA and MC-CDMA Systems [PDF]
, 2004 Lajos Hanzo +3 more
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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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Transmit Antenna Selection for Spatial Modulation Based on Hexagonal Quadrature Amplitude Modulation
Journal of Innovative Science and Engineering, 2021 There is a tremendous demand from various industries for next-generation 5G networks, which has dramatically increased the need for high data rates and energy efficiency.
Fatih COGEN, Erdoğan AYDIN
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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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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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