Results 31 to 40 of about 38,046,255 (222)

A low complexity hybrid combiner design for the ill‐conditioned multiuser mmWave massive MIMO uplink

IET Communications, 2021
This paper presents a simple and robust hybrid combiner for the multiuser massive multiple‐input multiple‐output (MIMO) uplink. The hybrid beamforming is used in massive MIMO systems to reduce the number of radio frequency chains.
Irfan Ahmed, Hedi Khammari, Fahad Alraddady   +2 more
doaj   +1 more source

Digital Beamforming Techniques for Spaceborne Radar Remote Sensing [PDF]

, 2006
This paper introduces the innovative concept of multidimensional waveform encoding for spaceborne synthetic aperture radar. The combination of this technique with digital beamforming on receive enables a new generation of SAR systems with improved ...
Moreira, Alberto, Gebert, Nicolas, Krieger, Gerhard   +2 more
core  

Adaptive beamforming for large arrays in satellite communications systems with dispersed coverage [PDF]

, 2011
Conventional multibeam satellite communications systems ensure coverage of wide areas through multiple fixed beams where all users inside a beam share the same bandwidth. We consider a new and more flexible system where each user is assigned his own beam,
Larue de Tournemine, Cécile, J. Montesinos, O. Besson, Besson, Olivier, C. Larue de Tournemine, Montesinos, Julien   +5 more
core   +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

Digital Beamforming and MIMO SAR: Review and New Concepts [PDF]

, 2012
Spaceborne Synthetic Aperture Radar (SAR) is a unique tool for large scale Earth observation, but the current generation of SAR sensors suffers from some fundamental limitations with regard to their imaging and mapping capabilities.
Villano, Michelangelo, Patyuchenko, Anton, Laskowski, Piotr, Huber, Sigurd, Bordoni, Federica, Moreira, Alberto, Younis, Marwan, Krieger, Gerhard, Kim, Junghyo, Rommel, Tobias, Lopez-Dekker, Paco   +10 more
core  

Multiuser hybrid analog/digital beamforming for relatively large-scale antenna arrays

, 2013
Power consumption and costs of the analog front-end (AFE) chains are often not negligible for large-scale antenna array systems. A low-complexity hardware architecture is to use a number of AFE chains that is less than the number of the antennas ...
Xiang, Wei, Jian Geng, Dacheng Yang, Geng, Jian, Xianling Wang, Wang, Xianling, Zaixue Wei, Wei, Zaixue, Yang, Dacheng, Wei Xiang   +9 more
core   +1 more source

A 64-Element 28 GHz Digital Beamformer Based on Tileable Synchronized Distributed Beamforming Chiplets

IEEE Open Journal of the Solid-State Circuits Society
A tileable 16-element, 4-beam, 28 GHz digital beamforming chiplet communicates over a power-efficient, low-latency Streaming-Advanced Interface Bus (AIB) data link to distribute digital beamforming processing across multiple chiplets.
Christine Weston, Rundao Lu, Zhengqi Xu, Hao Yu, Daniel Lambalot, Michael P. Flynn   +5 more
doaj   +1 more source

An Efficient Hybrid Beamforming Design for Massive MIMO Receive Systems via SINR Maximization Based on an Improved Bat Algorithm

IEEE Access, 2019
Hybrid analog and digital (HAD) beamforming has been recently receiving considerable deserved attention for practical implementation on the large-scale antenna systems.
Mohammed A. Almagboul, Feng Shu, Yaolu Qin, Xiaobo Zhou, Jin Wang, Yuwen Qian, Kingsley Jun Zou, Abdeldime Mohamed Salih Abdelgader   +7 more
doaj   +1 more source

A General and Efficient Framework for the Rapid Design of Miniaturized, Wideband, and High‐Bit RIS

Advanced Electronic Materials, EarlyView.
A general and efficient framework is proposed for the rapid design of high‐performance reconfigurable intelligent surfaces (RISs). This framework integrates advanced antenna design techniques and incorporates various load types, quantities, and values to achieve the design of high‐performance RISs.
Jun Wei Zhang, Zheng Xing Wang, Wanwan Cao, Zhen Jie Qi, Li Jie Wu, Han Qing Yang, Qun Yan Zhou, Si Ran Wang, Hui Dong Li, Jun Yan Dai, Jiang Luo, Jun Wei Wu, Jia Nan Zhang, Zhen Zhang, Qiang Cheng   +14 more
wiley   +1 more source

Digital beamforming and multidimensional waveform encoding for sapceborne radar remote sensing [PDF]

, 2007
This paper introduces the innovative concept of multidimensional waveform encoding for space-borne synthetic aperture radar (SAR). The combination of this technique with digital beamforming on receive enables a new generation of SAR systems with ...
Moreira, Alberto, Gebert, Nicolas, Krieger, Gerhard   +2 more
core