Results 31 to 40 of about 308,154 (181)

Reducing feedback requirements of the multiple weight opportunistic beamforming scheme via selective multiuser diversity [PDF]

, 2008
Opportunistic beamforming (OB) relies on the transmission of Channel State Information (CSI) in the form of instantaneous Signal to Noise Ratio (SNR) from Mobile Stations (MSs) back to the Base Station (BS) for scheduling purposes that increase ...
Nicolaou, M, Marios Nicolaou, Angela Doufexi, Doufexi, A, Armour, SMD, Simon Armour   +5 more
core   +1 more source

Reduction of Power Consumption in Hybrid Beamforming Integrated Circuits Using Amplitude Taper Grouping

IEEE Journal of Microwaves
A novel system design framework is proposed for hybrid beamforming receivers to reduce the power consumption withoutany loss in sensitivity or beam scanning performance.
Nick Cancrinus, Yanki Aslan, Alvaro Diaz-Bolado, Samer Medawar, Alessandro Matheoud, Alexander Yarovoy   +5 more
doaj   +1 more source

A Robust Secure Hybrid Analog and Digital Receive Beamforming Scheme for Efficient Interference Reduction

IEEE Access, 2019
Medium-scale or large-scale receive antenna array with digital beamforming can be employed at receiver to make a significant interference reduction but leads to expensive cost and high complexity of the RF-chain circuit.
Linlin Sun, Yaolu Qin, Zhihong Zhuang, Riqing Chen, Yijin Zhang, Jinhui Lu, Feng Shu, Jiangzhou Wang   +7 more
doaj   +1 more source

Transceiver Design in Millimeter Wave Full-Duplex Multi-User Massive MIMO Communication Systems

IEEE Access, 2021
We consider hybrid transmit precoding and receive combining in a millimeter wave (mmWave) multiple-input multiple-output (MIMO) multi-user cellular system, where a full-duplex (FD) base station (BS) serves multiple half-duplex (HD) uplink and downlink ...
Mostafa Darabi, Ali Cagatay Cirik, Lutz Lampe   +2 more
doaj   +1 more source

On the effect of SNR and superdirective beamforming in speaker diarisation in meetings [PDF]

, 2012
This paper examines the effect of sensor performance on speaker diarisation in meetings and investigates the use of more advanced beamforming techniques, beyond the typically employed delay-sum beamformer, for mitigating the effects of poorer sensor ...
Mike Lincoln, Zwyssig, E., Renals, S., Lincoln, M., Steve Renals, Erich Zwyssig   +5 more
core   +1 more source

Hybrid Precoding Using Out-of-Band Spatial Information for Multi-User Multi-RF-Chain Millimeter Wave Systems

IEEE Access, 2020
With a tremendous amount of underutilized bandwidth, millimeter wave (mmWave) communication is a promising solution to meet the increasing data-rate demands.
Zhannan Li, Chaozhu Zhang, I-Tai Lu, Xinghua Jia   +3 more
doaj   +1 more source

A low‐power and area‐efficient ultrasound receiver using beamforming successive approximation register analog‐to‐digital converter with capacitive digital‐to‐analog converter combined delay cell structure for 3‐D imaging systems

Electronics Letters, 2022
The authors present a low‐power area‐efficient subarray beamforming receiver (RX) structure for a miniaturized 3‐D ultrasound imaging system. Given that the delay‐and‐sum (DAS) and digitization functions consume most of the area and power in the receiver,
Seungah Lee, Soohyun Yun, Joonsung Bae
doaj   +1 more source

Radix-2 Self-Recursive Sparse Factorizations of Delay Vandermonde Matrices for Wideband Multi-Beam Antenna Arrays

IEEE Access, 2020
This paper presents a self-contained factorization for the Vandermonde matrices associated with true-time delay based wideband analog multi-beam beamforming using antenna arrays. The proposed factorization contains sparse and orthogonal matrices.
Sirani M. Perera, Arjuna Madanayake, Renato J. Cintra   +2 more
doaj   +1 more source

Cross‐scale Material‐Structure Synergy for 2D Metamaterials: Toward Customizable Intelligent Electromagnetic Manipulation in Multiphysics Fields

Advanced Science, EarlyView.
Recent advances in metasurface‐enabled low‐observable technologies are reviewed from the perspective of cross‐scale material–structure synergy. Electromagnetic, thermal, optical, and acoustic stealth are highlighted together with dynamic tuning, programmable coding, data‐driven inverse design, artificial intelligence, multispectral compatibility, and ...
Shuhao Wang, Xing Yang, Liping Liu, Yang Peng, Yangyang Wang, Hualiang Lv   +5 more
wiley   +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