Mathematical Model of Multichannel Time-Frequency System of Data Transmission Under Influence of Interference

1999 ◽  
Vol 31 (11) ◽  
pp. 99-102
Author(s):  
D. I. Zelinskiy
Keyword(s):  
Mathematical Model ◽  
Data Transmission ◽  
Time Frequency

scholarly journals Modeling Goodput for Data Transmission in FANET

2020 ◽  
Vol 6 (1) ◽  
pp. 100-108
Author(s):  
I. Kaisina
Keyword(s):  
Mathematical Model ◽  
Unmanned Aerial Vehicles ◽  
Transfer Process ◽  
Data Transmission ◽  
Data Transfer ◽  
Network Simulator ◽  
Data Traffic ◽  
Stream Data ◽  
Ground Station ◽  
Aerial Vehicles

This paper investigates the process of multi-stream data transmission from several unmanned aerial vehicles (UAV) to a ground station. We can observe a mathematical model of the data transfer process at the application level of the OSI model (from flying nodes to a ground station). The Poisson – Pareto packet process is used to describe the multi-stream data traffic. The results of simulation are obtained using the network simulator NS-3. It is considered a system for emulating the process of multi-stream data transmission from UAV to a ground station. Acording to the results of studies for multi-stream data transmission it is clear that the increase of the UAV source nodes which simultaneously transmit data to a ground station needs higher requirements for Goodput.

Dual-Tree Wavelet Packet Transform for Ultrasonic Data Transmission Through Metal Structures

2015 ◽  
Author(s):  
Jinjiang Wang ◽  
Robert X. Gao ◽  
Xinyao Tang ◽  
Zhaoyan Fan ◽  
Peng Wang
Keyword(s):  
Signal Processing ◽  
Data Transmission ◽  
Signal To Noise Ratio ◽  
Wavelet Packet ◽  
Experimental Studies ◽  
Wavelet Packet Transform ◽  
Signal To Noise ◽  
Metallic Structures ◽  
Time Frequency ◽  
Noise Ratio

Data communication through metallic structures is generally encountered in manufacturing equipment and process monitoring and control. This paper presents a signal processing technique for enhancing the signal-to-noise ratio and high-bit data transmission rate in ultrasound-based wireless data transmission through metallic structures. A multi-carrier coded-ultrasonic wave modulation scheme is firstly investigated to achieve high-bit data rate communication while reducing inter-symbol inference and data loss, due to the inherent signal attenuation, wave diffraction and reflection in metallic structures. To improve the signal-to-noise ratio, dual-tree wavelet packet transform (DT-WPT) has been investigated to separate multi-carrier signals under noise contamination, given its properties of shift-invariance and flexible time frequency partitioning. A new envelope extraction and threshold setting strategy for selected wavelet coefficients is then introduced to retrieve the coded digital information. Experimental studies are performed to evaluate the effectiveness of the developed signal processing method for manufacturing.

scholarly journals Voltage variations identification using gabor transform and rule-based classification method

2020 ◽  
Vol 10 (1) ◽  
pp. 681
Author(s):  
Weihown Tee ◽  
M. R. Yusoff ◽  
M. Faizal Yaakub ◽  
A. R. Abdullah
Keyword(s):  
Mathematical Model ◽  
Classification Method ◽  
Gabor Transform ◽  
Voltage Sag ◽  
Rule Based ◽  
Time Frequency ◽  
Voltage Variation ◽  
Frequency Representation ◽  
The Mathematical Model

This paper presents a comparatively contemporary easy to use technique for the identification and classification of voltage variations. The technique was established based on the Gabor Transform and the rule-based classification method. The technique was tested by using mathematical model of Power Quality (PQ) disturbances based on the IEEE Std 519-2009. The PQ disturbances focused were the voltage variations, which included voltage sag, swell and interruption. A total of 80 signals were simulated from the mathematical model in MATLAB and used in this study. The signals were analyzed by using Gabor Transform and the signal pattern, time-frequency representation (TFR) and root-mean-square voltage graph were presented in this paper. The features of the analysis were extracted, and rules were implemented in rule-based classification to identify and classify the voltage variation accordingly. The results showed that this method is easy to be used and has good accuracy in classifying the voltage variation.

scholarly journals Design of Tracking, Telemetry, Command (TT&C) and Data Transmission Integrated Signal in TDD Mode

2020 ◽  
Vol 12 (20) ◽  
pp. 3340
Author(s):  
Linshan Xue ◽  
Xue Li ◽  
Weiren Wu ◽  
Yikang Yang
Keyword(s):  
High Precision ◽  
Data Transmission ◽  
Measurement Technology ◽  
Complex Frequency ◽  
High Precision Measurement ◽  
Network Nodes ◽  
Time Frequency ◽  
Transmission Equipment ◽  
And Control ◽  
Extrapolation Error

For satellite or aircraft networks, tracking, telemetry, and control (TT&C) and data transmission between different nodes are necessary. Traditional measurement mostly adopts the frequency division duplex (FDD) mode and uses a continuous measurement system to achieve high-precision measurement. However, as the number of network nodes increases, the mode suffers from complex frequency domain allocation, and high-cost measurement and data transmission equipment is required. This paper proposes the integrated signal in time division duplex (TDD) mode to improve frequency utilization to address these circumstances. The proposed signal can transmit the TT&C and data at the same frequency. In addition, the high-precision time-frequency synchronization and relative measurement technology in the TDD mode for distributed spacecraft or aircraft networks are studied. The simulation results show that the signal can work normally when the Doppler extrapolation error is less than a quarter of the integration frequency. The distance extrapolation error should be less than a quarter of the length of a chip. The integrated signal reduces the frequency band occupation and realizes the integration of TT&C and data transmission. In addition, the measurement performance is reduced by only 2~3 dB compared with that of the traditional pure TT&C signal.

A non-linear mathematical model-based routing protocol for WBAN-based health-care systems

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Ch Rajendra Prasad ◽  
Polaiah Bojja
Keyword(s):  
Mathematical Model ◽  
Health Care ◽  
Energy Consumption ◽  
Routing Protocol ◽  
Data Transmission ◽  
Transmission Rate ◽  
Content Type ◽  
Data Transmission Rate ◽  
Model Based ◽  
Non Linear

Purpose This paper aims to present a non-linear mathematical model-based routing protocol for wireless body area networks (WBANs). Two non-linear mathematical models for WBANs are used in the proposed protocols Model 1 and Model 2. Model 1 intends to improve the data transmission rate and Model 2 intends to reduce energy consumption in the WBANs. These models are simulated for fixed deployment and priority-based data transmission, and performance of the network is analyzed under four constraints on WBANs. Design/methodology/approach Advancements in wireless technology play a vital role in several applications such as electronic health care, entertainment and games. Though WBANs are widely used in digital health care, they have restricted battery capacity which affects network stability and data transmission. Therefore, several research studies focused on reducing energy consumption and maximizing the data transmission rate in WBANs. Findings Simulation results of the proposed protocol exhibit superior performance in terms of four network constraints such as residual energy, the stability of the network, path loss and data transmission rate in contrast with conventional routing protocols. The performance improvement of these parameters confirms that the proposed algorithm is more reliable and consumes less energy than traditional algorithms. Originality/value The Model 1 of the proposed work provides maximum data extraction, which ensures reliable data transmission in WBANs. The Model 2 allocates minimal hop count path between the sink and the sensor nodes, which minimizes energy consumption in the WBANs.

Research of Multi-Channel Vehicle Brake Performance Testing System

2014 ◽  
Vol 644-650 ◽  
pp. 1144-1148
Author(s):  
Ze Quang Yi ◽  
Pan Nan
Keyword(s):  
Data Transmission ◽  
Performance Testing ◽  
Large Data ◽  
Testing System ◽  
Frequency Noise ◽  
Parallel Acquisition ◽  
Braking Performance ◽  
Time Frequency ◽  
Embedded Platform ◽  
Brake Performance

For the outstanding problems of traditional vehicle foundation braking performance testing systems’ such as lacking of test & analysis methods, inflexible and not easy to carry, a multi-channel Vehicle foundation break performance testing system based on CompactRIO embedded platform and LabVIEW was developed. The system design concept and concrete implementation of the key technologies such as parallel acquisition and data transmission, large data processing and time-frequency noise reduction were all introduces in detail. Actual break test experiment shows the effectiveness and reliability of the system.

scholarly journals Investigation of random access computer networks operating in a diffusion environment with an increasing number of subscriber stations

2020 ◽  
pp. 8-21
Author(s):  
Viacheslav Vavilov
Keyword(s):  
Mathematical Model ◽  
Communication Networks ◽  
Data Transmission ◽  
Multiple Access ◽  
Access Network ◽  
Random Access ◽  
Network Protocols ◽  
Modern World ◽  
Transmission Mechanisms ◽  
Repeated Calls

Improving the performance of various types of communication networks in the modern world remains an urgent task, in connection with which research is underway to create hardware that expands the throughput of physical channels, new network protocols are being developed and existing network protocols are being modified, mathematical and computer modeling of data transmission mechanisms in communication networks is being carried out. The speed and reliability of data transmission over networks also depends on a number of factors, the nature of the influence of which is random. The combination of such factors is called a random environment. If the change in the states of the medium is continuous, then we speak of a diffusion medium. The object of the research is communication networks controlled by multiple access protocols and functioning in a random (diffusion) environment. The research tool for multiple access networks is the mathematical apparatus of the theory of finite-difference and differential equations, the theory of random processes and the theory of queuing. The proposed mathematical model of communication networks in a diffusion environment is investigated by an asymptotic method. The scientific novelty of the work lies in the fact that for the first time a mathematical model of a multiple access network operating in a diffusion environment was proposed and an asymptotic study was carried out. The asymptotic average of the normalized number of claims in the orbit (the source of repeated calls) and the deviation from this average are found, and the probability density of the values of the process of changing the number of claims in the orbit is obtained.

Time and Frequency Characteristics of Temporary Threshold Shifts Caused by Pure Tone Exposures

2011 ◽  
Vol 97 (5) ◽  
pp. 809-818 ◽  
Author(s):  
Rodrigo Ordoñez ◽  
Dorte Hammershøi
Keyword(s):  
Mathematical Model ◽  
Short Duration ◽  
Pure Tone ◽  
Narrow Band ◽  
Frequency Characteristics ◽  
Auditory Function ◽  
Recovery Curve ◽  
Time Frequency ◽  
Band Noise ◽  
Pure Tones

The time-frequency characteristics of Temporary Threshold Shifts (TTS) caused by pure tones were determined using the Békésy audiometric method with narrow-band noise of short duration as the probe stimuli. Two experiments were done using exposures of 3 min at 100 dB above threshold. In the first experiment, the frequency dependent characteristics of TTS produced by a 500-Hz tone were assessed. Thresholds were determined from 0.25 to 2 kHz in 1/2-octave steps for up to 20 min after the exposure. The results showed that the maximum affected frequency was 1/2 octave above the exposure frequency. In the second experiment, the TTS recovery curve produced by a 1-kHz pure tone exposure was assessed at 1.5 kHz, at approximately 15 s intervals for the first 5 min and at regularly increasing intervals up to 45 min after the exposure. The results showed a maximum in the recovery around 2 min after the exposure. The data gathered in these experiments were used to construct a mathematical model of TTS recovery. The model describes both the 1/2-octave shift and the 2-min bounce and it can be used in the comparison of temporary changes in the auditory function, assessed at different times and frequencies.

Sign in / Sign up

Export Citation Format

Share Document