Results 21 to 30 of about 461,114 (287)

Optical wireless communication systems [PDF]

Optik, 2017
The emerging field of optical wireless communication (OWC) systems is seen as potential complementary technology to the radio frequency wireless communications in certain applications. It is deemed as a possible technology in the future 5th Generation communication networks to address the spectrum congestion and improve the system's capacity.
Ghassemlooy, Zabih, Zvanovec, Stanislav, Khalighi, Mohammad Ali, Popoola, Wasiu, Pérez, Joaquín, Khalighi, Mohammad-Ali   +5 more
openaire   +3 more sources

IoT and Big Data Applications in Smart Cities: Recent Advances, Challenges, and Critical Issues

IEEE Access, 2021
The notion of smart cities has remained under evolution as its global implementations are challenged by numerous technological, economic, and governmental obstacles.
Marieh Talebkhah, Aduwati Sali, Mohsen Marjani, Meisam Gordan, Shaiful Jahari Hashim, Fakhrul Zaman Rokhani   +5 more
doaj   +1 more source

Low-Complexity Hybrid Beamforming for Massive MIMO Systems in Frequency-Selective Channels

IEEE Access, 2019
Hybrid beamforming for frequency-selective channels is a challenging problem, as the phase shifters provide the same phase shift to all the subcarriers.
Sohail Payami, Mathini Sellathurai, Konstantinos Nikitopoulos   +2 more
doaj   +1 more source

Future broadband access network challenges [PDF]

, 2010
Copyright @ 2010 IEEEThe optical and wireless communication systems convergence will activate the potential capacity of photonic technology for providing the expected growth in interactive video, voice communication and data traffic services that are ...
Abdollahi, SR, Al-Raweshidy, H, Darzi, A, Nilavalan, R   +3 more
core   +1 more source

Robust Beamforming and User Clustering for Guaranteed Fairness in Downlink NOMA With Partial Feedback

IEEE Access, 2019
In this paper, a downlink multiuser non-orthogonal multiple access (NOMA) with full and partial channel state information (CSI) feedback is considered. We investigate beam design and user clustering from the throughput-fairness trade-off perspective.
Mohanad M. Al-Wani, Aduwati Sali, Nor K. Noordin, Shaiful J. Hashim, Chee Yen Leow, Ioannis Krikidis   +5 more
doaj   +1 more source

All-Dielectric Phase-Gradient Metasurface Performing High-Efficiency Anomalous Transmission in the Near-Infrared Region

Nanoscale Research Letters, 2021
We propose and numerically demonstrate a phase-gradient metasurface with high anomalous transmission efficiency and a large anomalous refraction angle that consists of discontinuous regular hexagonal nanorods supported by a silica substrate.
Tiesheng Wu, Zhihui Liu, Yiping Wang, Huixian Zhang, Zuning Yang, Weiping Cao, Dan Yang   +6 more
doaj   +1 more source

Waveform Optimization for Wireless Power Transfer with Nonlinear Energy Harvester Modeling

, 2015
Far-field Wireless Power Transfer (WPT) and Simultaneous Wireless Information and Power Transfer (SWIPT) have attracted significant attention in the RF and communication communities.
Bayguzina, Ekaterina, Clerckx, Bruno, Mitcheson, Paul D., Yates, David   +3 more
core   +1 more source

iTETRIS: An Integrated Wireless and Traffic Platform for Real-Time Road Traffic Management Solutions [PDF]

, 2008
Wireless vehicular cooperative systems have been identified as an attractive solution to improve road traffic management, thereby contributing to the European goal of safer, cleaner, and more efficient and sustainable traffic solutions.
Cartolano, Fabio, Filali, Fethi, Gozalvez, Javier, Krajzewicz, Daniel, Lan, Lin, Lazaro, Oscar, Robert, Eric, Turksma, Siebe, Urrutia, M. A.   +8 more
core  

Nanoscale Mapping of Plasmonic Charge Transport in Nano‐Resonators Based on Resistive Switching Materials

Advanced Functional Materials, EarlyView.
In this strategy, a conductive nano‐probe is employed to induce nanoscale phase transitions and map the nanoscale conductivity and trap density of GST films. By utilizing the contrasting properties of phase‐change states, nano‐resonators are fabricated that exhibit plasmonic conduction and dramatically different transport characteristics.
Sunwoo Bang, Seunghyo Park, Shashank Shekhar, Yuhyeon Oh, Seunghun Hong   +4 more
wiley   +1 more source

Efficient Matrix-Based Channel Hopping Schemes for Blind Rendezvous in Distributed Cognitive Radio Networks

Sensors, 2018
Channel rendezvous is an initial and important process for establishing communications between secondary users (SUs) in distributed cognitive radio networks.
AbdulMajid Al-Mqdashi, Aduwati Sali, Nor kamariah Noordin, Shaiful J. Hashim, Rosdiadee Nordin   +4 more
doaj   +1 more source