Signal Attenuation and Compensation Model in Long-Distance Communication

2014 ◽  
Vol 602-605 ◽  
pp. 3243-3246
Author(s):  
Na Shu
Keyword(s):  
Error Compensation ◽  
Control Method ◽  
Signal Transmission ◽  
Pulse Signal ◽  
Signal Attenuation ◽  
Long Distance ◽  
Communication Signal ◽  
Attenuation Rate ◽  
Distance Communication ◽  
Auto Regressive

The communication signal attenuation compensation method for long distance communication is studied in this paper in order to improve the accuracy of the signal transmission. In long-distance communication, due to the shock pulse signal attenuation, the accuracy of signal is reduced. The use of auto-regressive integrated moving control method of error compensation can solve this problem. In the process of communication, the cumulative attenuation rate of communications network is used to establish auto-regressive integrated moving control model to achieve cumulative error compensation. The experiment results show that compensating the total amount of cumulative attenuation of signal in long-distance communication can reduce the attenuating property of communication network and achieve the requirements of communication.

scholarly journals Birdsong and Sound Transmission: The Benefits of Reverberations

The Condor ◽  
2002 ◽  
Vol 104 (3) ◽  
pp. 564-573 ◽  
Author(s):  
Hans Slabbekoorn ◽  
Jacintha Ellers ◽  
Thomas B. Smith
Keyword(s):  
Bird Species ◽  
Sound Transmission ◽  
Acoustic Properties ◽  
Signal Design ◽  
Signal Attenuation ◽  
Long Distance ◽  
Animal Vocalizations ◽  
Distance Communication ◽  
The Relationship ◽  
Insight Into

Abstract Animal vocalizations used for long-distance communication are shaped by acoustic properties of the environment. Studies of the relationship between signal design and sound transmission typically focus on habitat-induced limitations due to signal attenuation and degradation. However, signal design may not entirely be explained by habitat limitations, but rather by beneficial consequences of reverberations. Narrow-frequency bandwidth notes (NFB notes) are pure notes that change little in frequency, and are typical for many bird species living in dense tropical forests. In contrast to frequency-modulated notes, we show that reverberations lead to a longer and louder signal after transmission for NFB notes. Furthermore, playback experiments to territorial males of an African passerine indicated that longer notes led to a stronger behavioral response. These results suggest that reverberations may benefit signal efficiency depending on the signal design, and add new insight into the selection pressures imposed on acoustic signals by the environment. Canto de Aves y Transmisión de Sonido: Beneficios de las Reverberaciones Resumen. Las vocalizaciones utilizadas por animales para la comunicación a larga distancia están condicionadas por las propiedades acústicas del entorno. Los estudios sobre la relación entre el diseño de las señales y la transmisión del sonido suelen centrarse en los límites impuestos por el hábitat debido a la atenuación y degradación de la señal. Sin embargo, es posible que el diseño de la señal no esté regido exclusivamente por las limitaciones del habitat, sino por las consecuencias beneficiosas de las reverberaciones. Las notas de frecuencia de banda estrecha (notas NFB) son notas puras que cambian poco de frecuencia y son típicas de varias especies que habitan bosques tropicales densos. Al contrario que en las notas de frecuencia modulada, mostramos que las reverberaciones alargan y aumentan la señal de las notas NFB. Asimismo, experimentos de playback con machos territoriales de un paseriforme africano indican que las notas más largas provocan una mayor respuesta. Estos resultados sugieren que las reverberaciones pueden mejorar la eficiencia de la señal, dependiendo del diseño de la misma, y añaden un nuevo componente a nuestro conocimiento sobre las presiones selectivas impuestas por el entorno sobre las señales acústicas.

Research of Zero-Cross Modulation Technology

2010 ◽  
Vol 40-41 ◽  
pp. 473-477
Author(s):  
Yong Li Chu ◽  
Yong Li Chen
Keyword(s):  
Communication Technology ◽  
Signal Transmission ◽  
Distribution Network ◽  
Signal Frequency ◽  
Fundamental Wave ◽  
Long Distance ◽  
Cross Modulation ◽  
Power Line Carrier Communication ◽  
Distance Communication ◽  
Modulation Signal

The zero-cross modulation technology is a communication technology for distribution network, different from the traditional distribution network power line carrier communication technology. Its basic principle is to use the TWACS of the power frequency voltage fundamental wave to realize the signal transmission, and the modulation signal frequency is low It can be long-distance communication across the transformer. The data reliability and data through rate are high. It has broad application prospects in real-time communication less demanding situations. This paper first introduces the principle of the zero-cross modulation technology, and then details the generation and the identification of the voltage modulation signal. Practice shows that the transmission success rate of zero-cross modulation signal is up to100%. Meet the actual needs.

Design and Implementation of the CNC Monitoring System Based on Internet of Things

2014 ◽  
Vol 945-949 ◽  
pp. 1552-1557 ◽  
Author(s):  
Yi Lin Zheng ◽  
Hu Lin ◽  
Xian Li Su
Keyword(s):  
Internet Of Things ◽  
Monitoring System ◽  
Sensor Nodes ◽  
Wireless Sensor ◽  
Long Distance ◽  
Wireless Sensor Nodes ◽  
Communication Signal ◽  
Cable Laying ◽  
Distance Communication ◽  
Internet Of Things Technology

Aiming at the shortcomings of the traditional CNC sensor network such as the difficult cable laying and long-distance communication signal attenuation, this paper designed the CNC monitoring system based on Internet of Things technology. The design reduced the power consumption of the wireless sensor nodes and the packet loss rate of the sink nodes through the hardware-software co-design. The Internet of Things protocol presented in this paper achieved the real-time communication between the CNC operating platform and the wireless sensor nodes. The experiment result shows that the CNC monitoring system based on Internet of Things technology can provide the temperature and vibration information for the CNC operating platform in time with the advantages of simple layout and reliable communication.

scholarly journals Lora Based End to End Tracking System Overcoming Signal Transmission Error

2021 ◽  
pp. 573-579
Author(s):  
Dr. M. Samayaraj Murali Kishanlal ◽  
Mithra Jagadeesan ◽  
Swetha Annie A.
Keyword(s):  
Tracking System ◽  
Signal Transmission ◽  
Transmission Error ◽  
Mobile App ◽  
Qr Codes ◽  
Long Distance ◽  
Asset Tracking ◽  
Effective Manner ◽  
Distance Communication ◽  
The City

Asset tracking is a method of tracking physical objects that involves scanning barcode labels attached to the assets or using tags that transmit their location using GPS, BLE, or RFID. These technologies can also be used to track people who are wearing a tag inside a house. RFID tags that are 'passive' transmit their location, but their transmission range is small (typically a few meters). Manual barcode scanning, such as QR codes, may be used to monitor assets. Smartphones with cameras and dedicated applications, as well as barcode readers, can be used to scan QR codes. Even though Bluetooth wasn't designed for localization, it has been used and can provide more accuracy. But all these have certain limitations with itself. In this project, a system had been developed for theft prevention and recovery of lost assets in an easier and faster way. The user of this system can be able to track the location of the asset once it has been moved in a long distance or stolen. This project utilizes long distance RF communication modules such as LoRa modules which provide long distance communication in terms of kilometres. The hardware component includes micro-controller, GPS, LoRa modules, etc. The LoRa modules can be distributed across the city for tracking of the asset. As the asset moves around the city, the location of that asset is been transmitted to a nearby LoRa which is then transmitted to the mobile app developed independently for tracking the asset. By this the user can have a track of their valuable asset. Thus, this project will help us in tracking the lost asset in an easy and effective manner.

A Voltage Control Method of Static Var Compensator for the Remote System Interconnected by Long Distance AC Cables

2011 ◽  
Vol 131 (11) ◽  
pp. 896-904
Author(s):  
Yuji Tamura ◽  
Shinji Takasaki ◽  
Yasuyuki Miyazaki ◽  
Hideo Takeda ◽  
Shoichi Irokawa ◽  
...  
Keyword(s):  
Control Method ◽  
Voltage Control ◽  
Static Var Compensator ◽  
Long Distance ◽  
Remote System

scholarly journals A Long-Distance Communication Architecture for Medical Devices Based on LoRaWAN Protocol

Electronics ◽  
2021 ◽  
Vol 10 (8) ◽  
pp. 940
Author(s):  
Nicoleta Cristina Gaitan
Keyword(s):  
Energy Consumption ◽  
Long Range ◽  
Medical Devices ◽  
Low Energy ◽  
Area Network ◽  
Wide Area Network ◽  
Long Distance ◽  
Communication Architecture ◽  
Low Energy Consumption ◽  
Distance Communication

Recent market studies show that the market for remote monitoring devices of different medical parameters will grow exponentially. Globally, more than 4 million individuals will be monitored remotely from the perspective of different health parameters by 2023. Of particular importance is the way of remote transmission of the information acquired from the medical sensors. At this time, there are several methods such as Bluetooth, WI-FI, or other wireless communication interfaces. Recently, the communication based on LoRa (Long Range) technology has had an explosive development that allows the transmission of information over long distances with low energy consumption. The implementation of the IoT (Internet of Things) applications using LoRa devices based on open Long Range Wide-Area Network (LoRaWAN) protocol for long distances with low energy consumption can also be used in the medical field. Therefore, in this paper, we proposed and developed a long-distance communication architecture for medical devices based on the LoRaWAN protocol that allows data communications over a distance of more than 10 km.

scholarly journals A Novel Adaptive Control Approach Based on Available Headroom of the VSC-HVDC for Enhancement of the AC Voltage Stability

Energies ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 3222
Author(s):  
Duc Nguyen Huu
Keyword(s):  
Adaptive Control ◽  
Voltage Stability ◽  
Reactive Power ◽  
Control Method ◽  
Offshore Wind ◽  
Voltage Source ◽  
Long Distance ◽  
Control Approach ◽  
Hvdc System ◽  
Voltage Support

Increasing offshore wind farms are rapidly installed and planned. However, this will pose a bottle neck challenge for long-distance transmission as well as inherent variation of their generating power outputs to the existing AC grid. VSC-HVDC links could be an effective and flexible method for this issue. With the growing use of voltage source converter high-voltage direct current (VSC-HVDC) technology, the hybrid VSC-HVDC and AC system will be a next-generation transmission network. This paper analyzes the contribution of the multi VSC-HVDC system on the AC voltage stability of the hybrid system. A key contribution of this research is proposing a novel adaptive control approach of the VSC-HVDC as a so-called dynamic reactive power booster to enhance the voltage stability of the AC system. The core idea is that the novel control system is automatically providing a reactive current based on dynamic frequency of the AC system to maximal AC voltage support. Based on the analysis, an adaptive control method applied to the multi VSC-HVDC system is proposed to realize maximum capacity of VSC for reactive power according to the change of the system frequency during severe faults of the AC grid. A representative hybrid AC-DC network based on Germany is developed. Detailed modeling of the hybrid AC-DC network and its proposed control is derived in PSCAD software. PSCAD simulation results and analysis verify the effective performance of this novel adaptive control of VSC-HVDC for voltage support. Thanks to this control scheme, the hybrid AC-DC network can avoid circumstances that lead to voltage instability.

scholarly journals Quantum repeaters based on concatenated bosonic and discrete-variable quantum codes

2021 ◽  
Vol 7 (1) ◽  
Author(s):  
Filip Rozpędek ◽  
Kyungjoo Noh ◽  
Qian Xu ◽  
Saikat Guha ◽  
Liang Jiang
Keyword(s):  
Continuous Variable ◽  
Quantum Codes ◽  
Discrete Variable ◽  
Long Distance ◽  
Concatenated Code ◽  
Different Types ◽  
Optical Modes ◽  
Distance Communication ◽  
Quantum Repeaters ◽  
Quantum Error

AbstractWe propose an architecture of quantum-error-correction-based quantum repeaters that combines techniques used in discrete- and continuous-variable quantum information. Specifically, we propose to encode the transmitted qubits in a concatenated code consisting of two levels. On the first level we use a continuous-variable GKP code encoding the qubit in a single bosonic mode. On the second level we use a small discrete-variable code. Such an architecture has two important features. Firstly, errors on each of the two levels are corrected in repeaters of two different types. This enables for achieving performance needed in practical scenarios with a reduced cost with respect to an architecture for which all repeaters are the same. Secondly, the use of continuous-variable GKP code on the lower level generates additional analog information which enhances the error-correcting capabilities of the second-level code such that long-distance communication becomes possible with encodings consisting of only four or seven optical modes.

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