scholarly journals Spectral properties of signal fading and Doppler spectra distribution in urban mobile communication links

2006 ◽  
Vol 6 (1) ◽  
pp. 113-126 ◽  
Author(s):  
N. Blaunstein ◽  
Y. Ben-Shimol
Keyword(s):  
Mobile Communication ◽  
Spectral Properties ◽  
Communication Links ◽  
Signal Fading

Parameterized indoor propagation model for mobile communication links

2016 ◽  
Vol 58 (4) ◽  
pp. 823-826 ◽  
Author(s):  
Alhareth Zyoud ◽  
Mohamed H. Habaebi ◽  
Rafiqul Islam
Keyword(s):  
Mobile Communication ◽  
Propagation Model ◽  
Indoor Propagation ◽  
Communication Links

scholarly journals Relay Selections for Security and Reliability in Mobile Communication Networks over Nakagami-m Fading Channels

2017 ◽  
Vol 2017 ◽  
pp. 1-8 ◽  
Author(s):  
Hongji Huang ◽  
Wanyou Sun ◽  
Jie Yang ◽  
Guan Gui
Keyword(s):  
Fading Channels ◽  
Communication Networks ◽  
Mobile Communication ◽  
Relay Selection ◽  
Direct Transmission ◽  
Transmission Scheme ◽  
Intercept Probability ◽  
Communication Links ◽  
Single Relay ◽  
Better Than

This paper studies the relay selection schemes in mobile communication system over Nakagami-m channel. To make efficient use of licensed spectrum, both single relay selection (SRS) scheme and multirelays selection (MRS) scheme over the Nakagami-m channel are proposed. Also, the intercept probability (IP) and outage probability (OP) of the proposed SRS and MRS for the communication links depending on realistic spectrum sensing are derived. Furthermore, this paper assesses the manifestation of conventional direct transmission scheme to compare with the proposed SRS and MRS ones based on the Nakagami-m channel, and the security-reliability trade-off (SRT) performance of the proposed schemes and the conventional schemes is well investigated. Additionally, the SRT of the proposed SRS and MRS schemes is demonstrated better than that of direct transmission scheme over the Nakagami-m channel, which can protect the communication transmissions against eavesdropping attacks. Additionally, simulation results show that our proposed relay selection schemes achieve better SRT performance than that of conventional direct transmission over the Nakagami-m channel.

scholarly journals 3D Point Cloud-Based Tree Canopy Visualization for a Smart Deployment of Mobile Communication Systems

2021 ◽  
Author(s):  
Yunus Egi ◽  
Engin Eyceyurt
Keyword(s):  
Machine Learning ◽  
Mobile Communication ◽  
Communication Systems ◽  
Point Cloud ◽  
Smart Cities ◽  
Signal Strength ◽  
Propagation Model ◽  
3D Point Cloud ◽  
Mobile Communication Systems ◽  
Signal Fading

Mobile communication is one of the most important parameters of smart cities in terms of maintaining connectivity and interaction between humans and smart systems. However, In the deployment process of Mobile Communication Systems (MCS), Radio Frequency (RF) engineers use location depended empirical Signal Strength Path Loss (SSPL) models ending up with poor signal strength and slow data connection. This is due to the fact that empirical propagation models usually are restrained by the environment and do not implement state of the art technologies, including Unmanned Aerial Vehicles (UAV), Light Detection and Ranging (LiDAR), Image Processing, and Machine Learning to increase efficiency. Terrains involving buildings, hills, trees, mountains, and human-made structures are considered irregular terrains by telecommunication engineers. Irregular terrains, specifically trees, significantly affect MCS’s efficiency because of their complex pattern resulting in erroneous signal fading via multi-path reflection and absorption. Therefore, a virtual 3D environment is required to extract the required 3D terrain pattern and elevation data from the environment. Once this data is processed in the machine learning algorithm, an adaptive propagation model can be formed and can significantly improve SSPL prediction accuracy for MCS. This chapter presents 3D point cloud visualization via sensor fusion and 2D image color classification techniques, which lead to a novel propagation model for the smart deployment of MCS. The proposed system’s main contribution is to develop an intelligent environment that eliminates limitations and minimizes related signal fading prediction errors. In addition, having better connectivity and efficiency will resolve the communication problem of smart cities. The chapter also provides a case study that significantly outperforms other empirical models with an accuracy of 95.4%.

SIGNAL FADING IN LAND-SATELLITE COMMUNICATION LINKS

2019 ◽  
Author(s):  
Nathan Blaunstein ◽  
Elad Bar
Keyword(s):  
Physical Model ◽  
Satellite Communication ◽  
Satellite Links ◽  
Communication Links ◽  
Signal Fading ◽  
Leo Satellite ◽  
Fading Phenomena ◽  
Complicated Configuration

The work considers effects of fading phenomena on signal data transmitted through the land-satellite communication links, accounting mostly for LEO satellite, as most complicated configuration of the satellite links. Based on the selec­ted, among other statistical and physical, model of fading effects prediction the pro­bability of fading phenomena in land-satellite communication links is analyzed for three cities in Israel, small, medium and large, and is compared with the results obtained by other authors above the Copenhagen, Stockholm and in England.

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