scholarly journals Multistandard Receiver Design for Telemedicine Monitoring System

2018 ◽  
Vol 2018 ◽  
pp. 1-8
Author(s):  
Hongmei Wang ◽  
Chong Yao ◽  
Faguang Wang ◽  
Shiyin Li ◽  
Sanghyuk Lee
Keyword(s):  
Monitoring System ◽  
Short Distance ◽  
Sampling Frequency ◽  
Medical Data ◽  
Wireless Transmission ◽  
Receiver Design ◽  
Bandpass Sampling ◽  
Data Measurement ◽  
Transmission Modes ◽  
Multistandard Receiver

In short-distance wireless communications for telemedicine monitoring, different medical data measurement equipment has different wireless transmission modes. A multistandard receiver is designed that can adapt to different medical data measuring equipment. Using a second-order bandpass sampling for the design of antialiasing filters, two aliasing signals can be separated. Simultaneously, constraint conditions for sampling frequency are not as critical. The design is useful for a multistandard receiver in a telemedicine monitoring system and has the advantages such as saving spectrum resources and facilitating spectrum planning.

Design and Implementation of Wireless Voltage Monitoring System Based on Zigbee

2017 ◽  
Vol 12 (3) ◽  
pp. 83-96 ◽  
Author(s):  
Luo Xiaohui
Keyword(s):  
Monitoring System ◽  
Single Phase ◽  
Low Cost ◽  
Moving Average ◽  
Voltage Sensor ◽  
Wireless Transmission ◽  
Phase Voltage ◽  
Medium Voltage ◽  
Wireless Monitoring ◽  
Three Phase

This paper proposed a low cost wireless monitoring system based on ZigBee wireless transmission, and designed a new floating voltage sensor which is suitable for the monitoring of medium voltage and high voltage(MV/HV) public equipment. The system used TI-CC2530 as the controller, proposed a new moving average voltage sensing(MAVS) algorithm by reasonable assumptions, and adopted algorithms to perform the theoretical analysis for the single phase and three-phase voltage. At last, the author carried out a practical experiment on the wireless floating voltage sensor under the voltage up to 30kV, the experimental results showed that the proposed low cost wireless sensor can achieve a good voltage monitoring function, and the error is less than 3%.

scholarly journals On wireless interference phenomena between ground waves and waves deviated by the upper atmosphere

1926 ◽  
Vol 113 (764) ◽  
pp. 450-458 ◽  
Keyword(s):  
Short Distance ◽  
Wave Length ◽  
Path Difference ◽  
Upper Atmosphere ◽  
Wireless Transmission ◽  
Continuous Change ◽  
Carrier Wave ◽  
Night Time ◽  
Side Band ◽  
Atmospheric Waves

In previous communications we have outlined two experimental methods of examining the effects of the atmospheric ionized layer in short-distance wireless transmission. In the first type of experiment the existence of night-time interference phenomena between two sets of waves was demonstrated by changing the wave-length of the transmitter continuously through a small range and observing the resultant maxima and minima of signal intensity. It was suggested that such interference took place between ground waves and waves deviated through large angles by the upper atmosphere. In the second type of experiment the angle of incidence of such atmospheric waves at the earth’s surface was measured by comparing the magnitude of the electric and magnetic forces in the stationary wave system produced at the ground. The results of these experiments were interpreted as yielding a direct experimental proof of the existence of the Kennelly-Heaviside layer, and also as demonstrating that the “fading” of broadcasting signals at moderate distances from the transmitter was due mainly to interference phenomena between two sets of waves arriving at a receiver with an appreciable path difference. But there still remained the problem of the cause of the natural succession of interference effects which constitutes fading at moderate distances, and which takes place continuously throughout the night-time. These variations indicate either that the phase relation between the ground and atmospheric waves is continually changing at night, or that intensity or polarization changes of the atmospheric waves are taking place. In considering possible causes of phase variations, let us examine the relation between the path difference and the wave-length for a typical case of short-distance transmission. Let D represent the path-difference between the ground and atmospheric rays. Then the atmospheric ray arrives n wavelengths behind the ground ray at the receiver, where n = D/ λ , and λ is the wave-length. It has been mentioned above that a possible cause of the natural signal variations which occur at night is a continuous change of phase which would be produced by a change in n . Such a change might be brought about by changes in D, or in λ , or in both simultaneously, and it is necessary to decide between these possibilities. Changes in D might be brought about by a variation in the height of the layer, so that a Döppler effect at "reflection” is produced. In such a case the signal variation might be regarded as the beating between the ground-ray frequency and the reflected-ray frequency. On the other hand, if there is a slow variation of transmitter frequency, the frequency of the atmospheric ray would be different from that of the ground ray, because of the difference in times of emission from the transmitter, and, again, the natural changes might be regarded as beats. The suggestion has already been made by Breit that fading is due to the modulation of the carrier wave, and thus to change of wave-length. In the latter connection we have to consider the variation of both carrier wave and side-band frequencies. The results of our earlier experiments suggested that the change of side-band frequency necessary for the wireless transmission of music is sufficient to produce selective frequency fading, and thus a certain amount of distortion. But with the normal type of modulation the signal intensity is chiefly dependent on the intensity of the carrier wave, and the question whether a slow “swing” of the carrier wave is responsible for such fading (which is observed whether the carrier wave is modulated or unmodulated) seems still unanswered. The question, of course, is equally of interest in both continuous wave telegraphy and wireless telephony.

scholarly journals Research on Beauty Medical Health Monitoring System Based on Wireless Sensor Network

2021 ◽  
Vol 2021 ◽  
pp. 1-8
Author(s):  
Xinwen Bi ◽  
Shaocheng Song ◽  
Haoyang Wang ◽  
Yingjian Shao ◽  
Xiaodan Zhang ◽  
...  
Keyword(s):  
Power Consumption ◽  
Monitoring System ◽  
Health Monitoring ◽  
Wireless Transmission ◽  
Wireless Sensor ◽  
Transmission Protocol ◽  
Gradual Improvement ◽  
Health Monitoring System ◽  
Average Power Consumption ◽  
Medical Health

Due to the gradual improvement of living standards in recent years and the continuous improvement of China’s health care awareness, the aesthetic medicine model has gradually changed from the treatment mode of disease treatment to the prevention mode of early detection and early treatment. Meanwhile, wireless sensor networks (WSNs) are gradually infiltrating into the medical field due to their low power consumption, small size, wireless transmission, and portability which complies with the needs of the development of medical models. Therefore, this paper studies and implements a beauty medical health monitoring system based on WSN and ZigBee short-range wireless transmission protocol; moreover, wireless power transfer (WPT) technology is used for charging sensors. Experimental results demonstrate the feasibility that the maximum power levels converted in sensors by the WPT for different ISM bands can meet the average power consumption expected in the range of 200–500 μW. And the designed system can provide an important practical reference for promoting the informationization of telemedicine and the development of beauty medical systems in China.

On the Development of Precision Seeder Intelligent Monitoring System Controlled by Single-Chip Microcomputer

2014 ◽  
Vol 615 ◽  
pp. 130-134
Author(s):  
Qing Yong Yin
Keyword(s):  
Monitoring System ◽  
High Sensitivity ◽  
Wireless Transmission ◽  
Single Chip ◽  
Pressure Monitoring ◽  
Single Chip Microcomputer ◽  
Intelligent Monitoring ◽  
Initial Stage

The development of precision seeder is still in an initial stage in China. Most seeders are mechanical and semi-precision sowing, and intelligent monitoring and controlling systems also have great shortage. This paper discusses intelligent seeding monitoring, fertilizer box and seed box margin monitoring, and bellows pressure monitoring. The main feature of this system is that it adopts modularity, sensor with high-sensitivity and wireless transmission technology for convenient maintenance, which greatly improves the reliability of the system, and provides a feasible scheme for the development of precision seeder.

Development of an Intellectualized Wireless Infusion Control/Monitoring System

2011 ◽  
Vol 480-481 ◽  
pp. 790-794
Author(s):  
Li Jun Bi ◽  
Hong Yu Sun ◽  
Shou Shan Liu
Keyword(s):  
Monitoring System ◽  
Small Volume ◽  
Communication Protocol ◽  
Low Cost ◽  
Wireless Transmission ◽  
Low Power Consumption ◽  
Single Chip ◽  
Single Chip Microcomputer ◽  
Single Chip Computer ◽  
Micro Controller Unit

One kind of automatic wireless infusion control/monitoring system based on micro controller unit(MCU) and nRF401 had been designed and implemented to overcome the shortages in the processing of venous transfusion care. The system used AT89C52 single-chip computer as machine’s core, the realization of communication between a master computer and a slave computer with nRF401. Doctors could get the information through the wireless transmission to control and monitor the process of transfusion in time. According to RS232 communication protocol, the system implements the communication between one computer and multi-computer by adopting AT89C51 single chip microcomputer. This system has many advantages, such as low cost, high precision, small volume, convenience, low power consumption, good extendibility and so on.

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