Results 31 to 40 of about 7,875,182 (223)

Transmit Diversity in the Downlink for the TETRA-TEDS System

Journal of Telecommunications and Information Technology, 2014
In the paper a proposal for the improvement of performance for the TETRA Enhanced Data System (TEDS) employing transmit diversity based on two antennas in the downlink is described.
Dominik A. Rutkowski, Sławomir Możdżonek   +1 more
doaj   +1 more source

Energy‐efficient data transmission technique for wireless sensor networks based on DSC and virtual MIMO

ETRI Journal, 2020
In a wireless sensor network (WSN), the data transmission technique based on the cooperative multiple‐input multiple‐output (CMIMO) scheme reduces the energy consumption of sensor nodes quite effectively by utilizing the space‐time block coding scheme ...
Manish Kumar Singh, Syed Intekhab Amin
doaj   +1 more source

Personal area networks with line-of-sight MIMO operation [PDF]

, 2006
In this paper, the results of an on-body, line-of-sight (LOS), multiple-input, multiple-output (MIMO) channel sounding investigation are reported. Transmission takes place between on-body antennas and a uniform linear array, positioned at close range and
Williams, C, Nix, AR, Neirynck, D, Beach, MA   +3 more
core   +1 more source

Study of Clustering Solutions for Scalable Cell-Free Massive MIMO

IEEE Access, 2023
In response to the requirements of 5G and beyond, cell-free systems have emerged to ensure uniform service throughout the area. However, the idea of having no cells leads to a considerably large monolithic system, which is not scalable.
Danaisy Prado-Alvarez, Daniel Calabuig, Jose F. Monserrat, Samer Bazzi, Wen Xu   +4 more
doaj   +1 more source

Semi-blind iterative joint channel estimation and K-best sphere decoding for MIMO

, 2013
An efficient and high-performance semi-blind scheme is proposed for Multiple-Input Multiple-Output (MIMO) systems by iteratively combining channel estimation with K-Best Sphere Decoding (SD).
Messier, G.G., Chen, Sheng, Magierowski, S., Dey, Indrakshi   +3 more
core   +2 more sources

Liquid‐Crystal‐Based Reconfigurable Intelligent Surface for 7 GHz Mobile Communication

Advanced Materials Technologies, EarlyView.
The glass‐based liquid‐crystal reconfigurable intelligent surface (LC‐RIS) integrates active‐matrix driving and blind‐greedy phase optimization within a 5G‐NR OFDM framework. This enables continuously tunable and autonomous enhancement of wireless coverage. Leveraging the transparency and manufacturability of liquid crystal panels, it is ideally suited
Tien‐Lun Ting, Yuh‐Chyi Chang, Yi‐Chan Hung, Cheng‐Yuan Hsiao, Chao‐Kai Wen, Tsung‐Hsien Lin   +5 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

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

On Distributed Radar Networks: Signal Model, Analysis, and Signal Processing

IEEE Journal of Microwaves
A key aspect of the imaging capability of radar systems is the angular resolution, which is determined by the aperture size of the antenna array. Therefore technologies such as MIMO and especially radar networks consisting of multiple independent MIMO ...
Vinzenz Janoudi, Pirmin Schoeder, Timo Grebner, Nils Appenrodt, Juergen Dickmann, Christian Waldschmidt   +5 more
doaj   +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