Results 61 to 70 of about 323,225 (210)

Sideband Suppression and Power Efficient Hybrid Beamforming Using Time-Modulated Arrays for Millimeter Wave Communications

IEEE Access
Hybrid beamforming is an essential technique to overcome the high path-loss of millimeter wave (mmWave) communications and allows a design trade-off between complexity and performance of fully digital and analog beamforming.
Yuchen Huang, Mohammed El-Hajjar, Lie-Liang Yang   +2 more
doaj   +1 more source

Optimal Hybrid Beamforming Design for Millimeter-Wave Massive Multi-User MIMO Relay Systems

IEEE Access, 2019
As a promising technology in the next generation mobile network, millimeter-wave (mmWave) communication can mitigate the spectrum crunch of improving the network capacity by exploiting the large underutilized spectrum bands of the mmWave frequencies. The
Yang Zhang, Jianhe Du, Yuanzhi Chen, Meng Han, Xingwang Li   +4 more
doaj   +1 more source

Ultra‐Fast and Energy‐Efficient PZT Optical Tunable Delay Lines for Programmable Photonic Systems

Laser &Photonics Reviews, EarlyView.
Thin‐film PZT enables optical tunable delay lines that simultaneously offer sub‐nanosecond switching, low propagation loss, and zero‐static‐power programmability. A five‐bit on‐chip delay line provides a maximum delay of 387.5 ps with a resolution of 12.5 ps, while reconfigurable MZI splitting ratios further enable non‐volatile optical arbitrary ...
Cunyu Shi, Chenlei Li, Wei Chen, Shengjie Tang, Tao Shu, Haojie Zhu, Haorui Liu, Yueyang Zhang, Long Zhang, William Shieh, Feng Qiu, Daoxin Dai   +11 more
wiley   +1 more source

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

Analog beamsteering for flexible hybrid beamforming design in mmwave communications [PDF]

2016 European Conference on Networks and Communications (EuCNC), 2016
In this paper, we propose an analog beamsteering approach for enabling flexible hybrid beamforming design that can achieve performance close to singular value decomposition (SVD) based digital beamforming with single user case. As a starting point, assuming the use of a codebook with infinite precision, we apply transposes of antenna array response ...
Yaning Zou, Wolfgang Rave, Gerhard P. Fettweis   +2 more
openaire   +2 more sources

Dumpsite Seabed Characterization of the San Pedro Basin, CA, From Autonomous Vehicle Observations

Journal of Field Robotics, EarlyView.
ABSTRACT A wide‐area seabed survey was conducted using autonomous underwater vehicles (AUVs) in a known dumpsite off the coast of Southern California that has been found to have widespread sediment contamination from the chemical dichlorodiphenyltrichloroethane (DDT).
Ryan A. McCarthy, Dylan Kriegman, Sophia T. Merrifield, Heidi Batchelor, Eric J. Terrill   +4 more
wiley   +1 more source

Analog-Digital Beamforming for Tunable-Load MIMO by Mutual Coupling Exploitation [PDF]

, 2017
In this paper, we propose a joint analog-digital (AD) beamforming scheme that exploits the mutual coupling effect to further improve the performance of multi-user multiple-input single-output (MU-MISO) systems.
Sellathurai, M, Sellathurai, Mathini; id_orcid, Li, Ang, Ang Li, Christos Masouros, Masouros, Christos, Masouros, C, Mathini Sellathurai, Li, A   +8 more
core   +1 more source

Low‐Complexity Hybrid Beamforming for LEO Satellites: Beam Update Rate Analysis and Advanced Adaptive Precoding

International Journal of Satellite Communications and Networking, EarlyView.
ABSTRACT Low Earth Orbit (LEO) satellite constellations offer unprecedented opportunities for global broadband connectivity but pose significant beamforming challenges due to rapid platform motion and stringent onboard hardware constraints. Fully digital architectures, while optimal in theory, remain impractical for satellite payloads, motivating ...
Mohammad Momani, Thomas Delamotte, Andreas Knopp   +2 more
wiley   +1 more source

Hybrid Analog-Digital Beamforming for Massive MIMO Systems

CoRR, 2017
In massive MIMO systems, hybrid beamforming is an essential technique for exploiting the potential array gain without using a dedicated RF chain for each antenna. In this work, we consider the data phase in a massive MIMO communication process, where the transmitter and receiver use fewer RF chains than antennas. We examine several different fully- and
Shahar Stein Ioushua, Yonina C. Eldar
openaire   +2 more sources

Spaceborne Distributed Array Processing for Precision Source Localization

International Journal of Satellite Communications and Networking, EarlyView.
ABSTRACT Satellite‐based signals intelligence and spectrum sensing increasingly rely on low‐latency signal localization. However, operational processing chains often remain ground‐based, stressing feeder links and limiting scalability as constellations grow.
Dany Mestas, Daniel Weinzierl, Thomas Delamotte, Hervé Legay, Andreas Knopp   +4 more
wiley   +1 more source