Results 41 to 50 of about 15,536 (231)

MIMO Cognitive Radios with Antenna Selection [PDF]

IEEE Transactions on Wireless Communications, 2011
In this paper, we propose two solutions to the problem of joint transmit-receive antenna selection in a multiple-input multiple-output (MIMO) cognitive radio (CR) system. Our objective is to maximize CR data rates and satisfy interference constraints at the primary user (PU) receiver(s).
Muhammad Fainan Hanif, Peter J. Smith 0001, Desmond P. Taylor, Philippa A. Martin   +3 more
openaire   +2 more sources

3-D Geometrical Model for Multi-Polarized MIMO Systems

IEEE Access, 2017
Multiple-input multiple-output (MIMO) systems capacity is highly influenced by the correlation between antennas, and the high correlation will result in a low capacity.
Xudong Cheng, Yejun He, Mohsen Guizani
doaj   +1 more source

Analysis and Design of Channel Estimation in Multicell Multiuser MIMO OFDM Systems [PDF]

, 2014
This paper investigates the uplink transmission in multicell multiuser multiple-input multiple-output (MIMO) orthogonal frequency-division multiplexing (OFDM) systems. The system model considers imperfect channel estimation, pilot contamination (PC), and
Xu, Peng, Qi, Feng, Wang, Jinkuan, Wang, Jiangzhou   +3 more
core   +1 more source

A Twelve-Ports Dual-Polarized MIMO Log-Periodic Dipole Array Antenna for UWB Applications [PDF]

Radioengineering, 2019
A twelve-port dual-polarized multiple-input–multiple-output (MIMO) log-periodic dipole array (LPDA) antenna for ultra-wideband (UWB) applications is proposed in this paper.
L. Y. Chen, J. S. Hong, M. Amin
doaj  

End‐to‐End Sensing Systems for Breast Cancer: From Wearables for Early Detection to Lab‐Based Diagnosis Chips

Advanced Materials Technologies, EarlyView.
This review explores advances in wearable and lab‐on‐chip technologies for breast cancer detection. Covering tactile, thermal, ultrasound, microwave, electrical impedance tomography, electrochemical, microelectromechanical, and optical systems, it highlights innovations in flexible electronics, nanomaterials, and machine learning.
Neshika Wijewardhane, Lyn I. Jones, Richard M. Martin, Helen Winter, Faezeh Arab Hassani   +4 more
wiley   +1 more source

A Generalized Spatial Modulation System Using Massive MIMO Space Time Coding Antenna Grouping

Entropy, 2020
Massive multiple input multiple output (MIMO), also known as a very large-scale MIMO, is an emerging technology in wireless communications that increases capacity compared to MIMO systems.
Amira I. Zaki, Mahmoud Nassar, Moustafa H. Aly, Waleed K. Badawi   +3 more
doaj   +1 more source

Terahertz Channel Modeling, Estimation and Localization in RIS‐Assisted Systems

Advanced Electronic Materials, EarlyView.
Reconfigurable intelligent surfaces have become a recent intensive research focus. Based on practical applications, channel strategies for RIS‐assisted terahertz wireless communication systems are categorized into three different types: channel modeling, channel estimation, and channel localization.
Hongjing Wang, Weipeng Wang, Xuan Cong, Shiyu Wang, Gao Li, Sen Gong, Lin Huang, Hongxin Zeng, Yaxin Zhang, Ziqiang Yang   +9 more
wiley   +1 more source

Depth-first and breadth-first search based multilevel SGA algorithms for near optimal symbol detection in MIMO systems [PDF]

, 2008
The multilevel structure of the N-QAM modulation constellations is exploited to significantly reduce the complexity of the sequential Gaussian approximation (SGA) algorithm for near optimal symbol detection in spatial multiplexing multiple- input ...
Sandell, M, Piechocki, RJ, Jia, Y, Andrieu, C   +3 more
core   +1 more source

Machine Learning‐Assisted Design and Performance Prediction of a Compact Dual‐Band Polarization‐Insensitive THz Metamaterial Absorber for Skin‐Cancer‐Related Refractive‐Index Sensing

Advanced Electronic Materials, EarlyView.
A compact QASRR‐based THz metamaterial absorber enables polarization‐insensitive dual‐band absorption and skin‐cancer‐related refractive‐index sensing through measurable resonance shifts. Field, surface‐current, and circuit analyses clarify the dual‐resonance mechanism, while StackNet‐assisted prediction accurately estimates the simulated absorption ...
Md. Murad Kabir Nipun, S. M. Rifatur Rana, Md. Golam Morshed, Imrose Jahan, F. A. Sabbir Ahamed, Md. Jahedul Islam   +5 more
wiley   +1 more source

Multiuser MIMO-OFDM for Next-Generation Wireless Systems

, 2007
This overview portrays the 40-year evolution of orthogonal frequency division multiplexing (OFDM) research. The amelioration of powerful multicarrier OFDM arrangements with multiple-input multiple-output (MIMO) systems has numerous benefits, which are ...
Jiang, M, Ming Jiang, Hanzo, L, Lajos Hanzo   +3 more
core   +1 more source