Results 31 to 40 of about 6,983 (148)

Distributed Multicell Beamforming With Limited Intercell Coordination

IEEE Transactions on Signal Processing, 2011
This paper studies distributed optimization schemes for multicell joint beamforming and power allocation in time-division-duplex (TDD) multicell downlink systems where only limited-capacity intercell information exchange is permitted. With an aim to maximize the worst-user signal-to-interference-and-noise ratio (SINR), we devise a hierarchical ...
Yongming Huang, Gan Zheng, Mats Bengtsson, Kai-Kit Wong, Luxi Yang, Björn Ottersten   +5 more
openaire   +1 more source

Transducers Across Scales and Frequencies: A System‐Level Framework for Multiphysics Integration and Co‐Design

Advanced Materials Technologies, EarlyView.
Transducers convert physical signals into electrical and optical representations, yet each mechanism is bounded by intrinsic trade‐offs across bandwidth, sensitivity, speed, and energy. This review maps transduction mechanisms across physical scale and frequency, showing how heterogeneous integration and multiphysics co‐design transform isolated ...
Aolei Xu, Mengyao Xiao, Zhouli Sui, Yinpeng Wang, Daoye Zheng, Yuxin Liu, Luwei Wang, Huajun Liu, Chengkuo Lee   +8 more
wiley   +1 more source

Low Complexity CS/CB Techniques for Aerial Assisted Cellular Network With Imperfect CSI

IEEE Access
The inclusion of aerial base stations (ABSs) into cellular networks has many potential benefits, including low-cost network connectivity for remote rural areas and quick deployment to provide coverage in emergencies and enhance capacity at hotspots ...
Sheila N. Mugala, Jonathan Serugunda, Dorothy K. Okello   +2 more
doaj   +1 more source

Adaptive Multicell 3D Beamforming in Multi-Antenna Cellular Networks

, 2015
We consider a cellular network with multi-antenna base stations (BSs) and single-antenna users, multicell cooperation, imperfect channel state information, and directional antennas each with a vertically adjustable beam.
Coldrey, Mikael, Heath Jr., Robert W., Seifi, Nima, Svensson, Tommy   +3 more
core   +1 more source

Massive MIMO Multicasting in Noncooperative Cellular Networks [PDF]

, 2014
We study the massive multiple-input multiple-output (MIMO) multicast transmission in cellular networks where each base station (BS) is equipped with a large-scale antenna array and transmits a common message using a single beamformer to multiple mobile ...
Meixia Tao, Senior Member, Xiaodong Wang, Zhengzheng Xiang   +3 more
core   +1 more source

3D Large‐Scale Subwavelength‐Resolution Sound Sheet Tomography Based on an Active and Programmable Circular Meta‐Array

Advanced Science, EarlyView.
A programmable 2048‐element circular ultrasound array combined with a compact acoustic lens produces a thin “sound sheet” over a large field of view, and records echoes with wide angular diversity across the ring aperture. Coherence‐enhanced beamforming converts full‐matrix data into high‐contrast tomographic slices, delivering near‐diffraction‐limited
Qiu‐De Zhang, Zi‐Bin Lin, Zhuo Chen, Zhao‐Hui Liu, Jin‐Lian He, Jun‐Jie Song, Long‐Sheng Zeng, Liang Zhou, Ming‐Yue Ding, Yu‐Gui Peng, Ming Yuchi, Xue‐Feng Zhu   +11 more
wiley   +1 more source

Coordinated beamforming design in downlink multi-cell multi-user wireless networks

Tongxin xuebao, 2012
To obtain the good sum-rate performance in multi-cell multi-user wireless networks with frequency reuse,coordinated beamforming design problem of co-channel interference mitigation was studied.Theoretical analysis results with the game theory show that ...
Pei-zhong XIE, Bao-yu ZHENG, Wen-jing YUE   +2 more
doaj   +2 more sources

Optimality Properties, Distributed Strategies, and Measurement-Based Evaluation of Coordinated Multicell OFDMA Transmission

, 2011
The throughput of multicell systems is inherently limited by interference and the available communication resources. Coordinated resource allocation is the key to efficient performance, but the demand on backhaul signaling and computational resources ...
Bengtsson, Mats, Björnson, Emil, Jaldén, Niklas, Ottersten, Björn   +3 more
core   +2 more sources

Random Time‐Space Coding Metasurfaces for Spatial Control of the Temporal Statistics of Electromagnetic Fields

Advanced Science, EarlyView.
A probabilistic framework based on random time‐space coding metasurfaces enables control of the spatial distribution of electromagnetic fields temporal statistics. By tailoring the marginal and joint distributions of random codes, electromagnetic fields with desired mean and variance patterns are realized, enabling simultaneous transmission and jamming.
Jia Cheng Li, Jiang Han Bao, Che Liu, Tie Jun Cui   +3 more
wiley   +1 more source

Employing Coordinated Transmit and Receive Beamforming in Clustering Double-Directional Radio Channel

EURASIP Journal on Wireless Communications and Networking, 2007
A novel beamforming (BF) system that employs two switched beam antennas (SBAs) at both ends of the wireless link in an indoor double-directional radio channel (DDRC) is proposed.
Ohira Takashi, Sun Chen, Taromaru Makoto
doaj   +2 more sources