scholarly journals Time-Varying Ultra-Wideband Channel Modeling and Prediction

Symmetry ◽  
2018 ◽  
Vol 10 (11) ◽  
pp. 631
Author(s):  
Ahmed M. Al-Sammna ◽  
Marwan Hadri Azmi ◽  
Tharek Abd Rahman
Keyword(s):  
Channel Modeling ◽  
Least Square ◽  
Ultra Wideband ◽  
Delay Spread ◽  
Recursive Least Square ◽  
Rms Delay Spread ◽  
Modeling And Prediction ◽  
Outdoor Environments ◽  
Efficient Prediction ◽  
Performance Results

This paper considers the channel modeling and prediction for ultra-wideband (UWB) channels. The sparse property of UWB channels is exploited, and an efficient prediction framework is developed by introducing two simplified UWB channel impulse response (CIR) models, namely, the windowing-based on window delay (WB-WD) and the windowing-based on bin delay (WB-BD). By adopting our proposed UWB windowing-based CIR models, the recursive least square (RLS) algorithm is used to predict the channel coefficients. By using real CIR coefficients generated from measurement campaign data conducted in outdoor environments, the modeling and prediction performance results and the statistical properties of the root mean square (RMS) delay spread values are presented. Our proposed framework improves the prediction performances with lower computational complexity compared with the performance of the recommended ITU-R UWB-CIR model. It is shown that our proposed framework can achieved 15% lower prediction error with a complexity reduction by a factor of 12.

Channel Modeling of Vehicle Detection System for UWB Communication

2012 ◽  
Vol 505 ◽  
pp. 414-419
Author(s):  
Shu Ai Gong ◽  
Zhe Xin Xu ◽  
Lin Wang
Keyword(s):  
Channel Model ◽  
Detection System ◽  
Vehicle Detection ◽  
Channel Modeling ◽  
Ultra Wideband ◽  
Delay Spread ◽  
Rms Delay Spread ◽  
Transmitted Signal ◽  
Uwb Communication ◽  
Structure Properties

In this paper, a new channel model through ultra-wideband (UWB) communication for vehicle detection system (VDS) is proposed. The Gauss 2st derivative function is used as the transmitted signal and the received signal is evaluated. The main objective of this work is to provide an analytical approach for obtaining the main parameters under new channel through the bodywork structure properties. The characteristic of the RMS delay spread is discussed in this paper.

scholarly journals The Internet of Bodies: A Systematic Survey on Propagation Characterization and Channel Modeling

2020 ◽  
Author(s):  
Abdulkadir Celik ◽  
Khaled N. Salama ◽  
Ahmed Eltawil
Keyword(s):  
Human Body ◽  
Channel Modeling ◽  
Multipath Fading ◽  
Ultra Wideband ◽  
Future Research ◽  
Delay Spread ◽  
The Internet ◽  
Systematic Survey ◽  
Coupling Methods ◽  
Wide Range

<div>The Internet of Bodies (IoB) is an imminent extension to the vast Internet of things domain, where interconnected devices (e.g., worn, implanted, embedded, swallowed, etc.) located in-on-and-around the human body form a network. Thus, the IoB can enable a myriad of services and applications for a wide range of sectors, including medicine, safety, security, wellness, entertainment, to name but a few. Especially considering the recent health and economic crisis caused by novel coronavirus pandemic, a.k.a. COVID-19, the IoB can revolutionize today's public health and safety infrastructure. Nonetheless, reaping the full benefit of IoB is still subject to addressing related risks, concerns, and challenges. Hence, this survey first outlines the IoB requirements and related communication and networking standards. Considering the lossy and heterogeneous dielectric properties of the human body, one of the major technical challenges is characterizing the behavior of the communication links in-on-and-around the human body. Therefore, this paper presents a systematic survey of channel modeling issues for various link types of human body communication (HBC) channels below 100 MHz, the narrowband (NB) channels between 400 MHz and 2.5 GHz, and ultra-wideband (UWB) channels from 3 to 10 GHz. After explaining bio-electromagnetics attributes of the human body, physical and numerical body phantoms are presented along with electromagnetic propagation tool models. Then, the first-order (i.e., path loss, shadowing, multipath fading) and the second-order (i.e., delay spread, power delay profile, average fade duration, level crossing rate, etc.) channel statistics for NB and UWB channels are covered with a special emphasis on body posture, mobility, and antenna effects. For the HBC channels, three different coupling methods are considered: capacitive, galvanic, and magnetic. Based on these coupling methods, four different channel modeling methods (i.e., analytical, numerical, circuit, and empirical) are investigated, and electrode effects are discussed. Lastly, interested readers are provided with open research challenges and potential future research directions.</div><div><br></div>

scholarly journals The Internet of Bodies: A Systematic Survey on Propagation Characterization and Channel Modeling

2020 ◽  
Author(s):  
Abdulkadir Celik ◽  
Khaled N. Salama ◽  
Ahmed Eltawil
Keyword(s):  
Human Body ◽  
Channel Modeling ◽  
Multipath Fading ◽  
Ultra Wideband ◽  
Future Research ◽  
Delay Spread ◽  
The Internet ◽  
Systematic Survey ◽  
Coupling Methods ◽  
Wide Range

<div>The Internet of Bodies (IoB) is an imminent extension to the vast Internet of things domain, where interconnected devices (e.g., worn, implanted, embedded, swallowed, etc.) located in-on-and-around the human body form a network. Thus, the IoB can enable a myriad of services and applications for a wide range of sectors, including medicine, safety, security, wellness, entertainment, to name but a few. Especially considering the recent health and economic crisis caused by novel coronavirus pandemic, a.k.a. COVID-19, the IoB can revolutionize today's public health and safety infrastructure. Nonetheless, reaping the full benefit of IoB is still subject to addressing related risks, concerns, and challenges. Hence, this survey first outlines the IoB requirements and related communication and networking standards. Considering the lossy and heterogeneous dielectric properties of the human body, one of the major technical challenges is characterizing the behavior of the communication links in-on-and-around the human body. Therefore, this paper presents a systematic survey of channel modeling issues for various link types of human body communication (HBC) channels below 100 MHz, the narrowband (NB) channels between 400 MHz and 2.5 GHz, and ultra-wideband (UWB) channels from 3 to 10 GHz. After explaining bio-electromagnetics attributes of the human body, physical and numerical body phantoms are presented along with electromagnetic propagation tool models. Then, the first-order (i.e., path loss, shadowing, multipath fading) and the second-order (i.e., delay spread, power delay profile, average fade duration, level crossing rate, etc.) channel statistics for NB and UWB channels are covered with a special emphasis on body posture, mobility, and antenna effects. For the HBC channels, three different coupling methods are considered: capacitive, galvanic, and magnetic. Based on these coupling methods, four different channel modeling methods (i.e., analytical, numerical, circuit, and empirical) are investigated, and electrode effects are discussed. Lastly, interested readers are provided with open research challenges and potential future research directions.</div><div><br></div>

scholarly journals UWB Radio Propagation Measurements in a Desktop Environment

2010 ◽  
Vol 6 (2) ◽  
pp. 74
Author(s):  
Duje Čoko ◽  
Dinko Begušić ◽  
Zoran Blažević
Keyword(s):  
Radio Propagation ◽  
Ultra Wideband ◽  
Delay Spread ◽  
Personal Area Networks ◽  
Network Analyzer ◽  
Wireless Personal Area Networks ◽  
Impulse Responses ◽  
Rms Delay Spread ◽  
Measurement Results ◽  
Uwb Radio

The ultra-wideband wireless personal area networks are expected to be most commonly employed in desktop environments. This paper presents a measurement campaignconducted on a typical office desk. A pair of omnidirectionalUWB antennas and a vector network analyzer were used tomeasure the impulse responses over a frequency rang spanning from 6 GHz to 8.5 GHz, in accordance with the UWB regulations in Europe. The coherence bandwidth and the rms delay spread are calculated from the measurement results. A significant correlation between these wideband parameters is found, but only at higher correlation thresholds.

scholarly journals Design and Analysis of Different Optical Attocells Deployment Models for Indoor Visible Light Communication System

2021 ◽  
Vol 13 (6) ◽  
Author(s):  
M.S.M Gismalla ◽  
◽  
M.F.L Abdullah ◽  
Mustafa Sami Ahmed ◽  
Wafi A Mabrouk ◽  
...  
Keyword(s):  
Visible Light ◽  
Electromagnetic Interference ◽  
Low Cost ◽  
Visible Light Communication ◽  
Delay Spread ◽  
Interference Immunity ◽  
Rms Delay Spread ◽  
Received Power ◽  
Performance Results ◽  
Ber Performance

Visible light communication (VLC) is a promising candidate that is expected to revolutionize indoor environment communications performance and fulfill fifth generation and beyond (5GB) technologies requirements. It offers high and free bandwidth, electromagnetic interference immunity, low-cost front end and low power consumption. Also, VLC has dual functions that could be utilized in both illumination and communication concurrently. The number of optical attocells (OAs) and their deployment in the room represent the main issue that should be taken into consideration in designing an optimal VLC system. In this paper, we have introduced a new model of five OAs in the typical room. In addition to an investigation of various optical attocells (OAs) deployment models, in which a multi-variable evaluation was performed in terms of received power, illumination, SNR and RMS delay spread in order to determine the optimal OAs model. Also, various modulation schemes performances were investigated which included NRZ-OOK, BPSK, and QPSK in order to improve the BER performance. Results indicated that BPSK modulation had superior BER performance when compared with all OAs models. Further, a comprehensive results analysis and comparison of all proposed models was conducted over various parameters, in which our new proposed OAs model achieved an optimal performance in comparison with the other models.

scholarly journals The Internet of Bodies: A Systematic Survey on Propagation Characterization and Channel Modeling

2020 ◽  
Author(s):  
Abdulkadir Celik ◽  
Khaled N. Salama ◽  
Ahmed Eltawil
Keyword(s):  
Human Body ◽  
Channel Modeling ◽  
Multipath Fading ◽  
Ultra Wideband ◽  
Future Research ◽  
Delay Spread ◽  
The Internet ◽  
Systematic Survey ◽  
Coupling Methods ◽  
Wide Range

<div>The Internet of Bodies (IoB) is an imminent extension to the vast Internet of things domain, where interconnected devices (e.g., worn, implanted, embedded, swallowed, etc.) located in-on-and-around the human body form a network. Thus, the IoB can enable a myriad of services and applications for a wide range of sectors, including medicine, safety, security, wellness, entertainment, to name but a few. Especially considering the recent health and economic crisis caused by novel coronavirus pandemic, a.k.a. COVID-19, the IoB can revolutionize today's public health and safety infrastructure. Nonetheless, reaping the full benefit of IoB is still subject to addressing related risks, concerns, and challenges. Hence, this survey first outlines the IoB requirements and related communication and networking standards. Considering the lossy and heterogeneous dielectric properties of the human body, one of the major technical challenges is characterizing the behavior of the communication links in-on-and-around the human body. Therefore, this paper presents a systematic survey of channel modeling issues for various link types of human body communication (HBC) channels below 100 MHz, the narrowband (NB) channels between 400 MHz and 2.5 GHz, and ultra-wideband (UWB) channels from 3 to 10 GHz. After explaining bio-electromagnetics attributes of the human body, physical and numerical body phantoms are presented along with electromagnetic propagation tool models. Then, the first-order (i.e., path loss, shadowing, multipath fading) and the second-order (i.e., delay spread, power delay profile, average fade duration, level crossing rate, etc.) channel statistics for NB and UWB channels are covered with a special emphasis on body posture, mobility, and antenna effects. For the HBC channels, three different coupling methods are considered: capacitive, galvanic, and magnetic. Based on these coupling methods, four different channel modeling methods (i.e., analytical, numerical, circuit, and empirical) are investigated, and electrode effects are discussed. Lastly, interested readers are provided with open research challenges and potential future research directions.</div><div><br></div>

scholarly journals Large-Scale Fading and Time Dispersion Parameters of UWB Channel in Underground Mines

2008 ◽  
Vol 2008 ◽  
pp. 1-10 ◽  
Author(s):  
Abdellah Chehri ◽  
Paul Fortier ◽  
Pierre Martin Tardif
Keyword(s):  
Mobile Communications ◽  
Path Loss ◽  
Worker Safety ◽  
Ultra Wideband ◽  
Underground Mines ◽  
Delay Spread ◽  
Rms Delay Spread ◽  
5 Ghz ◽  
Mean Excess Delay ◽  
Uwb Channel

RF channel measurements in underground mines have important applications in the field of mobile communications for improving operational efficiency and worker safety. This paper presents an experimental study of the ultra wideband (UWB) radio channel, based on extensive sounding campaigns covering the underground mine environment. Measurements were carried out in the frequency band of 2–5 GHz. Various communication links were considered including both line-of-sight (LOS) and non-LOS (NLOS) scenarios. In this paper, we are interested in more details of the variations of the RMS delay spread and mean excess delay with Tx/Rx separation, and the variation of RMS with mean excess. The distance dependency of path loss and shadowing fading statistics is also investigated. To give an idea about the behaviour of UWB channel in underground mines, a comparison of our approach with other published works is given including path loss exponent, shadow fading variance, mean excess delay, and RMS delay spread.

scholarly journals Millimeter Wave Propagation Measurements and Characteristics for 5G System

2020 ◽  
Vol 10 (1) ◽  
pp. 335 ◽  
Author(s):  
Ahmed M. Al-Samman ◽  
Marwan Hadri Azmi ◽  
Y. A. Al-Gumaei ◽  
Tawfik Al-Hadhrami ◽  
Tharek Abd. Rahman ◽  
...  
Keyword(s):  
Millimeter Wave ◽  
Measurement Data ◽  
Path Loss ◽  
Ultra Wideband ◽  
Line Of Sight ◽  
Delay Spread ◽  
Rms Delay Spread ◽  
5G Systems ◽  
Mean Excess Delay ◽  
Wideband Channel

In future 5G systems, the millimeter wave (mmWave) band will be used to support a large capacity for current mobile broadband. Therefore, the radio access technology (RAT) should be made available for 5G devices to help in distinct situations, for example device-to-device communications (D2D) and multi-hops. This paper presents ultra-wideband channel measurements for millimeter wave bands at 19, 28, and 38 GHz. We used an ultra-wideband channel sounder (1 GHz bandwidth) in an indoor to outdoor (I2O) environment for non-line-of-sight (NLOS) scenarios. In an NLOS environment, there is no direct path (line of sight), and all of the contributed paths are received from different physical objects by refection propagation phenomena. Hence, in this work, a directional horn antenna (high gain) was used at the transmitter, while an omnidirectional antenna was used at the receiver to collect the radio signals from all directions. The path loss and temporal dispersion were examined based on the acquired measurement data—the 5G propagation characteristics. Two different path loss models were used, namely close-in (CI) free space reference distance and alpha-beta-gamma (ABG) models. The time dispersion parameters were provided based on a mean excess delay, a root mean square (RMS) delay spread, and a maximum excess delay. The path loss exponent for this NLOS specific environment was found to be low for all of the proposed frequencies, and the RMS delay spread values were less than 30 ns for all of the measured frequencies, and the average RMS delay spread values were 19.2, 19.3, and 20.3 ns for 19, 28, and 38 GHz frequencies, respectively. Moreover, the mean excess delay values were found also at 26.1, 25.8, and 27.3 ns for 19, 28, and 38 GHz frequencies, respectively. The propagation signal through the NLOS channel at 19, 28, and 38 GHz was strong with a low delay; it is concluded that these bands are reliable for 5G systems in short-range applications.

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