Results 21 to 30 of about 134,405 (281)
Phased array calibration system with high accuracy and low complexity
Alexandria Engineering Journal, 2023 This paper presents a highly efficient phased array calibration system for phase and magnitude error correction. The proposed calibration system is based on far-field scanning of the array antenna under test at factory level. Since the proposed structure
Sol Kim +3 more
doaj +1 more source
IEEE Access, 2022 In this study, we perform an analytical investigation of the electro-optic (EO), Mach-Zehnder modulator (MZM) transmission boundary area with a nonlinear model.
Yus Natali +2 more
doaj +1 more source
Radio frequency interface quality assessment in 4G/5G: Effects of IQ imbalance, phase noise, and nonlinearities on error vector magnitude. [PDF]
PLoS OneModern 4G/5G technologies aim to enhance data speeds, improve communication quality, and enable innovative services such as IoT and augmented reality.
Pyatin I, Boiko J, Kovtun V, Kovtun O.
europepmc +2 more sources
Robust adaptive beamforming using a Bayesian steering vector error model [PDF]
, 2013 We propose a Bayesian approach to robust adaptive beamforming which entails considering the steering vector of interest as a random variable with some prior distribution.
Bidon, Stéphanie, Besson, Olivier
core +1 more source
BMC Ophthalmology, 2018 Background To evaluate the refractive and visual outcomes of Transepithelial photorefractive keratectomy (TransPRK) in the treatment of low to moderate myopic astigmatism.
Lei Xi, Chen Zhang, Yanling He
doaj +1 more source
Concurrent Dual-Band Receiver Based on Novel Six-Port Correlator for Wireless Applications
IEEE Access, 2017 A concurrent dual-band six-port receiver based on real-valued time-delay neural network (RVTDNN) is proposed in this paper to retrieve two baseband signals from a dual-band radio frequency signal, concurrently.
Weiwei Zhang +5 more
doaj +1 more source
Error vector magnitude relation to magnitude andphase distortionin 8-PSK systems
Electronics Letters, 2001 Distortion in 8-PSK systems is a consequence of magnitude and phase disturbances. This work investigates the effects of such distortions (either isolated or combined) due to Gaussian bandpass noise, through analytical and simulation studies. Analytical expressions are derived and analytical-based results, relating error vector magnitude to symbol error
J.L. Pinto, I. Darwazeh
openaire +1 more source
IEEE Access, 2019 Transmission in non-line-of-sight (NLOS) conditions has a poor throughput in device-to-device (D2D) communications. In order to achieve high throughput, adaptive modulation has been selected as a spectrally-efficient transmission technology.
Fan Yang +7 more
doaj +1 more source
IEEE Access, 2019 Latency, error vector magnitude (EVM) and compression ratio (CR) are performance evaluation factors of IQ data compression. The purposes of IQ data compression are to minimize the latency, EVM and to maximize the CR.
Jewon Lee, Eunhee Hyun, Joon-Young Jung
doaj +1 more source
Linear Regression vs. Deep Learning for Signal Quality Monitoring in Coherent Optical Systems
IEEE Photonics Journal, 2022 Error vector magnitude (EVM) is a metric for assessing the quality of m-ary quadrature amplitude modulation (mQAM) signals. Recently proposed deep learning techniques, e.g., feedforward neural networks (FFNNs) -based EVM estimation scheme leverage fast ...
Yuchuan Fan +11 more
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