Results 21 to 30 of about 259 (91)
Adaptive Modulation Schemes for OFDM and SOQPSK Using Error Vector Magnitude (EVM) and Godard Dispersion [PDF]
, 2014 Abstract : n this paper, we develop a new approach which enables adaptation across two modulation schemes in the iNET standard: orthogonal frequency-division multiplexing (OFDM) and shaped-offset quadrature phased-shift keying (SOQPSK). We present the error vector magnitude (EVM) for OFDM and second-order Godard dispersion (D(2)) for SOQPSK as our link
Enkuang D. Wang +2 more
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IEEE Access, 2022 Error vector magnitude (EVM) and out-of-band emissions are key metrics for evaluating in-band and out-band distortions introduced by all potential non-idealities in the transmitters of wireless systems. As EVM is a measure of the quality of the modulated
Angela Hernandez-Solana +5 more
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Nondata-aided error vector magnitude based adaptive modulation over rapidly time-varying channels
Tongxin xuebao, 2017 A novel nondata-aided error vector magnitude based adaptive modulation(NDA-EVM-AM) was proposed to solve the problem of lower spectral efficiency over rapidly time-varying wireless channels.Namely,NDA-EVM was considered as a metric to reflect the rapid ...
Fan YANG +5 more
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On the Equalization of an OFDM-Based Radio-over-Fiber System Using Neural Networks [PDF]
Radioengineering, 2017 In this study the impact of a Radio-over-Fiber (RoF) subsystem on the performance of Orthogonal Frequency Division Multiplexing (OFDM) system is evaluated.
L. Safari +3 more
doaj
Optimized Silicon QPSK Modulator With 64-Gb/s Modulation Speed
IEEE Photonics Journal, 2015 We demonstrate a compact silicon quadrature phase-shift keying (QPSK) modulator consisting of two nested Mach-Zehnder interferometers with a size of 4.5-mm2. The V11 · L of the modulator is 1.4 V · cm with an insertion loss of 8 dB.
Haike Zhu +8 more
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IEEE Access, 2022 Envisaged network scaling in the beyond 5G and 6G era makes the optical transport of high bandwidth radio signals a critical aspect for future radio access networks (RANs), while the move toward wireless transmission in millimeter-wave (mm-wave) and ...
Colm Browning +3 more
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Ingeniería Investigación y Desarrollo, 2016 This paper presents an approach for dynamic reconfiguration of wavelength channels for future indoor network architectures. The approach exploits the tunability and the rejection profile of Fiber Bragg Gratings (FBG) to implement service distribution ...
Gustavo Adolfo Puerto-Leguizamón +2 more
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IEEE Photonics Journal, 2022 An all-optical aggregator consisting of time-lens and a phase reloader for two four-channel multiplexed quadrature phase shift keying (QPSK) signals to a wavelength division multiplexed (WDM) 16-ary quadrature amplitude modulation (16QAM) signal is ...
Yu Ding +3 more
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Nondata-aided error vector magnitude performance analysis over κ−μ shadowed fading channel
Tongxin xuebao, 2018 The performance prediction of wireless system over κ−μ shadowed fading channels was a challenging problem of wireless communications,which affects transmission scheme design seriously.To solve this problem,a novel method of quantifying the κ−μ shadowed ...
Fan YANG +6 more
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Theoretical Analysis of Hole Punch Signal Conditioning for High Efficiency EER Power Amplifiers
EURASIP Journal on Wireless Communications and Networking, 2010 High efficiency and linearity can be achieved using Kahn's envelope elimination and restoration (EER) technique. However, when used with modulation schemes such as code division multiple access (CDMA) and orthogonal frequency division multiplexing ...
Abdul K. Mustafa, Mike Faulkner
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