scholarly journals Design of optimal MIMO channel under line-of-sight environment by using directional antennas

2013 ◽  
Vol 2 (2) ◽  
pp. 62-66 ◽  
Author(s):  
Yusuke Hori ◽  
Kodai Iguchi ◽  
Daisuke Uchida ◽  
Hiroyuki Arai
Keyword(s):  
Directional Antennas ◽  
Mimo Channel ◽  
Line Of Sight

scholarly journals Design of an Electrically Small, Planar Quasi-Isotropic Antenna for Enhancement of Wireless Link Reliability under NLOS Channels

2020 ◽  
Vol 10 (18) ◽  
pp. 6204 ◽  
Author(s):  
Sonapreetha Mohan Radha ◽  
Mingyu Jung ◽  
Pangun Park ◽  
Ick-Jae Yoon
Keyword(s):  
Directional Antennas ◽  
Radiation Efficiency ◽  
Line Of Sight ◽  
Delivery Ratio ◽  
Wireless Link ◽  
Received Signal Strength Indicator ◽  
Link Reliability ◽  
Receiving Antenna ◽  
Small Loop ◽  
Non Line Of Sight

The performance of wireless networks can be greatly influenced by the radiation pattern and polarization of the antennas at the nodes, especially when they are under non-line-of-sight (NLOS) channel environments. In this study, we designed a planar quasi-isotropic antenna based on the combination of a meandered electric dipole and an electrically small loop at a frequency of 2.45 GHz. Its electrical size (ka) is 0.47 and shows a gain deviation of 3.01 dB with radiation efficiency of 82.6% per the simulation. The performance of a wireless link under the line-of-sight and NLOS channels in an indoor environment was measured using the proposed quasi-isotropic antenna as a receiving antenna after validating its radiation and impedance properties experimentally (the measured gain deviation: 5.2 dB, the measured radiation efficiency: 79.2%). This study demonstrates that better properties are achieved using the quasi-isotropic antenna. The quasi-isotropic antenna shows an improved packet delivery ratio (PDR) and received signal strength indicator (RSSI) compared to the results using omni-directional antennas as a transmitting and receiving pair in the NLOS channels. To the best of our knowledge, the experimental validation of the enhancement of wireless link reliability using a quasi-isotropic antenna has not been reported before, and was first carried out in this study.

Beyond Visual Line of Sight UAV Control for Remote Monitoring Using Directional Antennas

2019 ◽  
Author(s):  
Songwei Li ◽  
Yixin Gu ◽  
Bishrut Subedi ◽  
Chenyuan He ◽  
Yan Wan ◽  
...  
Keyword(s):  
Remote Monitoring ◽  
Directional Antennas ◽  
Line Of Sight

scholarly journals MIMO Channel Characteristics in Line-of-Sight Environments

10.5772/7691 ◽  
2010 ◽  
Author(s):  
Leilei Liu ◽  
Wei Hong ◽  
Nianzu Zhang ◽  
Haiming Wang ◽  
Guangqi Yang
Keyword(s):  
Mimo Channel ◽  
Line Of Sight ◽  
Channel Characteristics

scholarly journals Large-Scale Channel Modeling and Measurements for 10 GHz in Indoor Environments

2019 ◽  
Vol 2019 ◽  
pp. 1-10
Author(s):  
Iury S. Batalha ◽  
Andréia V. R. Lopes ◽  
Jasmine P. L. Araújo ◽  
Fabrício J. B. Barros ◽  
Bruno L. S. Castro ◽  
...  
Keyword(s):  
Large Scale ◽  
Channel Modeling ◽  
Directional Antennas ◽  
Measured Data ◽  
Comprehensive Analysis ◽  
Line Of Sight ◽  
Indoor Environments ◽  
Computer Engineering ◽  
Cross Polarization ◽  
Non Line Of Sight

With the advent of 5G mobile communication and researches into the propagation of large-scale channel modeling for frequencies above 6 GHz, measurement investigation was performed at 10 GHz with horn-type directional antennas in a corridor and a computer room within the Electrical and Computer Engineering Laboratories’ first floor, at Federal University of Pará (UFPA), Brazil. This paper presents data obtained through experimental work, channel modeling with co-polarization V-V and H-H and cross-polarization V-H in line-of-sight (LOS) or non-line-of-sight (NLOS) conditions. The large-scale close-in reference is sustained by a comprehensive analysis, considering propagation mechanisms such as reflection and diffraction. Results demonstrate that the established model had inferior standard deviation in relation to measured data, proving itself more significant to propagation in indoor environments.

Characterization of Line-of-Sight MIMO Channel for Fixed Wireless Communications

2007 ◽  
Vol 6 ◽  
pp. 36-39 ◽  
Author(s):  
Leilei Liu ◽  
Wei Hong ◽  
Haiming Wang ◽  
Guangqi Yang ◽  
Nianzu Zhang ◽  
...  
Keyword(s):  
Wireless Communications ◽  
Mimo Channel ◽  
Line Of Sight ◽  
Fixed Wireless

Scattered Propagation MIMO Channel Model for Non-Line-of-Sight Ultraviolet Optical Transmission

2017 ◽  
Vol 29 (21) ◽  
pp. 1907-1910 ◽  
Author(s):  
Heng Qin ◽  
Yong Zuo ◽  
Feiyu Li ◽  
Risheng Cong ◽  
Lingchao Meng ◽  
...  
Keyword(s):  
Optical Transmission ◽  
Channel Model ◽  
Mimo Channel ◽  
Line Of Sight ◽  
Non Line Of Sight
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