Results 31 to 40 of about 668,337 (217)

A full-cooperative diversity beamformingscheme in two-way amplify-and-forward relay systems

Digital Communications and Networks, 2015
Consider a simple two-way relaying channel in which two single-antenna sources exchange information via a multiple-antenna relay. For such a scenario, all the existing approaches that can achieve full cooperative diversity order are based on antenna ...
Zhongyuan Zhao, Zhiguo Ding, Mugen Peng, Yong Li   +3 more
doaj   +1 more source

Metasurface‐Based Multidimensional Light‐Field Manipulation: From Technologies to Applications

Advanced Science, EarlyView.
Multidimensional metasurfaces enable versatile manipulation of multiple optical degrees of freedom, including phase, amplitude, polarization, wavelength, and orbital angular momentum. This review summarizes their fundamental mechanisms, emerging strategies for multidimensional light‐field control, and key applications in optical computing, imaging ...
Heliang Yin, Shuo Sun, Jiahao Zhang, Jianuo Hu, Yubin Qiao, Liang Chen, Jin Li   +6 more
wiley   +1 more source

Terahertz Channel Modeling, Estimation and Localization in RIS‐Assisted Systems

Advanced Electronic Materials, EarlyView.
Reconfigurable intelligent surfaces have become a recent intensive research focus. Based on practical applications, channel strategies for RIS‐assisted terahertz wireless communication systems are categorized into three different types: channel modeling, channel estimation, and channel localization.
Hongjing Wang, Weipeng Wang, Xuan Cong, Shiyu Wang, Gao Li, Sen Gong, Lin Huang, Hongxin Zeng, Yaxin Zhang, Ziqiang Yang   +9 more
wiley   +1 more source

Energy-efficient collaborative transmission algorithm based on potential game theory for beamforming

International Journal of Distributed Sensor Networks, 2019
A group of collaborative nodes can efficiently complete spatial long-distance transmission tasks using beamforming technology. However, a high sidelobe level interferes with communication quality, and uneven energy consumption of nodes affects network ...
Jing Zhang, Li Lei, Xin Feng
doaj   +1 more source

Decoupling Backward Scattering Control and Forward Beamformed Communication in a Shared‐Aperture Retro‐Reflective/Transmissive Metasurface [PDF]

Nanophotonics
Conceptual illustration of the retro‐reflective and transmissive metasurface (RRTM). The blue radar establishes communication with the UAV via the transmissive mode, whereas the purple surveillance radar acquires the status of friendly units through the retro‐reflective mode and the two modes operate simultaneously within the same decoupled aperture ...
Zhang S, Zhu R, Jia Y, Wu F, Cai X, Zhang Z, Liu D, Guo Y, Wang J.   +8 more
europepmc   +2 more sources

Random beamforming OFDMA for future generation cellular communication systems [PDF]

, 2007
This paper presents a downlink performance analysis of a Layered Random Beamforming (LRB) - MIMO-OFDMA Physical Layer (PHY) as applicable to future generation wireless communication systems.
Joe McGeehan, Yong Sun, Angela Doufexi, Doufexi, A, McGeehan, JP, Han, C, Sun, Y, Armour, SMD, Simon Armour, Congzheng Han   +9 more
core   +1 more source

Autonomous Charging and Battery Swapping for Unmanned Aerial Vehicles: A Review

Advanced Intelligent Systems, EarlyView.
This review evaluates major autonomous charging and battery swapping methods for unmanned aerial vehicles (UAVs) against a single question: how close each is to sustained unattended operation. Rather than ranking them by charging performance, it identifies the limitation that most restricts each method, and briefly outlines the supporting technologies ...
Zelin Wu, Yuanwen Zhang, Xiangdong Meng, Guangyu Zhang, Huiwen Zhang, Yuquan Leng   +5 more
wiley   +1 more source

Sociotropy-Inspired Potential Game for Cooperative MIMO Beamforming

Applied Sciences
This paper introduces a sociotropy-inspired game-theoretic framework for distributed multiple-input multiple-output (MIMO) beamforming systems, where each antenna element is modeled as a strategic agent that adapts its beamforming parameters by balancing
Evangelos D. Spyrou, Chrysostomos Stylios, Vassilios Kappatos, Constantinos T. Angelis   +3 more
doaj   +1 more source

Scalable coordinated beamforming for dense wireless cooperative networks [PDF]

2014 IEEE Global Communications Conference, 2014
To meet the ever growing demand for both high throughput and uniform coverage in future wireless networks, dense network deployment will be ubiquitous, for which co- operation among the access points is critical. Considering the computational complexity of designing coordinated beamformers for dense networks, low-complexity and suboptimal precoding ...
Yuanming Shi, Jun Zhang 0004, Khaled Ben Letaief   +2 more
openaire   +4 more sources

Kaleidoscopic Electromagnetic Wave Manipulation via a Universal Reconfigurable Metasurface Platform

Electron, EarlyView.
A multidimensional reconfigurable metasurface enables independent control of the amplitude, phase, polarization, and spectral responses of reflected electromagnetic (EM) waves. Integrating spatial, polarization, and spectral manipulation within a single platform, it provides a versatile solution for intelligent EM systems, next‐generation wireless ...
Wanting Tong, Yi Wu, Ye Deng, Cheng Zhang, Chaoyun Song, Yizhou Shen, Junming Zhao, Tian Jiang, Ke Chen, Yijun Feng   +9 more
wiley   +1 more source