Results 171 to 180 of about 6,839,717 (234)

2-D Luneburg Lens Beamforming Network for Planar Phased Array of Antennas to Radiate Near-Field Focused Multibeams

IEEE Transactions on Antennas and Propagation, 2020
In this article, a two-dimensional (2-D) Luneburg lens-based beamforming network (LL-BFN) realizable on parallel-plate-sandwiched substrates is implemented to excite a planar phased array of antennas for near-field focus (NFF) applications of multibeam ...
Shang-Che Chang, H. Chou, Hao-Ju Huang
semanticscholar   +1 more source

High-Mobility Massive MIMO With Beamforming Network Optimization: Doppler Spread Analysis and Scaling Law

IEEE Journal on Selected Areas in Communications, 2020
In high-mobility massive multiple-input multiple-output (MIMO) systems, Doppler shifts compensation can be combined with beamforming network to effectively suppress the channel time variation.
Yinghao Ge, Weile Zhang, F. Gao, Shun Zhang, Xiaoli Ma   +4 more
semanticscholar   +1 more source

Modeling distributed beamforming in wireless networks

2008 46th Annual Allerton Conference on Communication, Control, and Computing, 2008
Distributed beamforming in wireless ad hoc networks has the promise of greatly improving network throughput. However, unlike traditional beamforming from a fixed array, the random locations of the nodes collaborating to form the array lead to a random beam pattern.
Kery Hardwick, Dennis Goeckel, Don Towsley   +2 more
openaire   +2 more sources

Virtual Cell Beamforming in Cooperative Networks

IEEE Journal on Selected Areas in Communications, 2014
We study the coordinated transmission problem in cooperative cellular networks where a cluster of base stations forms a virtual cell to serve a mobile station (MS). The performance of such an MS-centric virtual cell network is dictated by the beamformer that enables to suppress interference; however, designing a beamformer is highly challenging due to ...
Kim, J Kim, Jihwan, Lee, HW Lee, Hyang-Won, Chong, S Chong, Song   +2 more
openaire   +2 more sources

Ultra‐compact 3 × 3 Nolen matrix beamforming network

, 2020
A novel compact 3 × 3 Nolen matrix beamforming network is proposed in this study. Unlike the Butler matrix and Blass matrix, in this design, the proposed feeding network only requires couplers and phase shifters and removes crossovers and load ...
H. Ren, Hanxiang Zhang, B. Arigong
semanticscholar   +1 more source

Collaborative beamforming in ad hoc networks

Manufacturing Engineer, 2005
The performance of collaborative beamforming is analyzed using the theory of random arrays. The statistical average and distribution of the beam patterns of randomly generated phased arrays are derived in the framework of wireless ad hoc sensor networks.
Hideki Ochiai, Patrick Mitran, H. Vincent Poor, Vahid Tarokh   +3 more
openaire   +1 more source

Compact Broadband Substrate-Integrated Coaxial Line 2-D Beamforming Network and Its Multibeam Array Antenna Applications

IEEE transactions on microwave theory and techniques
This article presents a compact broadband 16-way two-dimensional (2-D) Butler matrix (BM)-based beamforming network (BFN) using multilayer substrate-integrated coaxial line (SICL).
W. Li, Jun Xu, Renrong Zhao, W. Hong
semanticscholar   +1 more source

A Fully Reconfigurable 1×4Filtering Beamforming Network With Continuous Phase and Amplitude Control

IEEE transactions on microwave theory and techniques
In this article, a reconfigurable $1\times4$ filtering beamforming network (FBFN), which is capable of generating reconfigurable progressive phase difference and amplitude distribution, is presented for the first time.
Zhihua Wei, Xu Zhu, P. Chi, Ruifeng Xu, T. Yang   +4 more
semanticscholar   +1 more source

Multibeam Radiations From Circular Periodic Array of Vivaldi Antennas Excited by an Integrated 2-D Luneburg Lens Beamforming Network

IEEE Antennas and Wireless Propagation Letters, 2020
An antenna array is developed to radiate angularly distributed multibeams. The proposed antenna utilizes a 2-D Luneburg lens as a beamforming network (LL-BFN) to produce rotationally symmetric excitations. The concept is to replace an equivalent circular
H. Chou, Shang-Che Chang, Hao-Ju Huang
semanticscholar   +1 more source

Single-/Dual-Beam Switchable Beamforming Network Based on Phase-Shifter-Relaxed 4 × 4 Nolen Matrix

IEEE Transactions on Antennas and Propagation
A novel beamforming network providing switchable states between single and dual beams is proposed. A new topology of the phase-shifter (PS)-relaxed Nolen matrix based on two-section couplers with arbitrary coupling coefficients and arbitrary phase ...
B. Xu, Ye Yang, Shaoyong Zheng, W. Che
semanticscholar   +1 more source