On physical limit of wireless digital transmission from radio wave propagation perspective

Karasawa, Yoshio

doi:10.1002/2016rs006040

Cited by 6 publications

(4 citation statements)

References 13 publications

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“…In telecontrol systems, reception times τ Rx,k and transmission times τ Tx,k , the variation with respect to time is due to the fact that its duration depends on the increase in technological infrastructure, seasonal or hourly factors, cyclic factors, irregular factors [22], and communications protocols used for the exchange of information [23]. The reception time τ Rx,k ∈ + is a period of time in which information is sent from Client A to the telecontrol server in an interval k ∈ Z + .…”

Section: Discussionmentioning

confidence: 99%

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Communication Times Reconstruction in a Telecontrolled Client–Server Scheme: An Approach by Kalman Filter Applied to a Proprietary Real-Time Operating System and TCP/IP Protocol

Martínez¹,

López

Delgado-Reyes

et al. 2022

Mathematics

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Nowadays, various systems were developed in the telecommunications field which make use of technologies for the transmission and reception of information. One of these technologies is the Internet, which was developed in tandem with scientific growth. Therefore, its application in the control of various industrial processes has a notable influence. In this context, there are industrial processes that, due to the potential danger they represent to human beings, must be controlled by means of a remote control system. Such systems can be implemented through client–server communication schemes, which form a network of computers to exchange information. In the exchange of information, delay times are generated. These inactivity times have a close relationship with the latency in the communication network and have a negative impact on the performance of closed-loop control systems. In this sense, for physical implementation, it is essential to measure and mathematically characterize their magnitudes in order to know their variability and thus be able to design control strategies that compensate for their effects. Hence, this research paper presents the reconstruction of the communication times measured from a telecontrol system, where it is assumed that only one subsystem acts as the controller and the other one acts as the controlled. In other words, this paper addresses a control scheme type of single-input-single-output system (SISO). This reconstruction is based on the Kalman filter, which estimates the communication times that are measured on an experimental test bench with a client–server communication scheme. Communication times are characterized as stochastic processes. So, in order to validate the reconstruction presented, the level of dependence between the random processes is evaluated by analyzing their moments of probability as well as their covariance moments. Finally, an analysis based on the mean square error is presented, through which it can be concluded that the reconstruction technique used allows one to know the dynamics of the communication times generated by the remote control process presented in this research.

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Section: Discussionmentioning

confidence: 99%

“…In the case of reception times τ Rx,k and transmission times τ Tx,k , the variation with respect to time is due to the fact that its duration depends on the increase in technological infrastructure, seasonal or hourly factors, cyclic factors, irregular factors [22], and communications protocols used for the exchange of information [23].…”

Section: Introductionmentioning

confidence: 99%

Communication Times Reconstruction in a Telecontrolled Client–Server Scheme: An Approach by Kalman Filter Applied to a Proprietary Real-Time Operating System and TCP/IP Protocol

Martínez¹,

López

Delgado-Reyes

et al. 2022

Mathematics

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“…Since human society entered the age of electrification, electrical energy has been transmitted by wires, and the use of wires to transmit electrical energy is subject to many restrictions [1][2][3]. For example, in special industrial environments such as mines and oil extraction, the use of wires for power supply has deficiencies such as poor flexibility, easy sparking, and exposed transmission lines, which may cause safety accidents such as explosions [4][5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Optimization analysis of transmission characteristics of wireless energy transmission system based on dynamic tuning algorithm

2023

Applied Mathematics and Nonlinear Sciences

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This paper aims to optimize the transmission characteristics of the wireless energy transmission system by optimizing the design of the coupling coils in the system, the system multi-parameter matching and the coil offset problem so that the overall wireless energy transmission system works in the best condition. The mathematical model of the power and efficiency of the two-coil MCRWPT is derived through the optimal tuning theory, and the principle of the wireless energy transmission method is analyzed to determine the wireless energy transmission method of the equivalent capacitive regulation circuit. By comparing the effects of load on output power and transmission efficiency under different topologies, a plane with a two-coil structure applicable to the wireless charging transmission system is selected to improve the transmission efficiency of the system. In the experimental verification of the WPT transmission characteristics optimization and dynamic tuning, it is concluded that the efficacy of the system is improved simultaneously with the transmission efficiency up to 91% when the load is adjusted to 298 mΩ for the load value adjusted at the transmission distance of 0.075m.

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“…Radio communications since its advent in the early nineteenth century has been the mainstream mode of short and long distance connectivity but its capacity is now approaching the critical limits [1] [2] in the new era of bigdata, internet of things (IoT) and growing information burst between multiple devices and platforms. The radio frequency spectrum is consistently congested while communication engineers and system architects usually have to work around signal interference problems especially in collocated and multi-node systems.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Photodiode Array Sensor Aided MEMS Fine Steering Mirror Control for Laser Communication Platforms

Ishola

Cho

2021

IEEE Access

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Line-of-sight laser communication application scenarios are numerous including land, mobile, maritime, airborne and space platforms for conventional and tactical utilization. However, beam pointing and stabilization are complicated in dynamic systems such as orbiting satellite to ground receiver, drones, aircrafts and metropolitan free-space optical links vulnerable to natural and artificial disturbances. Small Satellite platforms such as CubeSats are even more challenging due to their limited size and on-board resources. This paper presents an experimental study on a feedback photodiode array sensor assisted control of a one-axis micro-electromechanical (MEMS) fine steering mirror stabilizing a laser communication link on an optical bench in the laboratory. Disturbance profiles similar to vibrations on dynamic platforms are induced into the setup using an electrodynamic vibration machine to test the efficacy of the MEMS fine steering control mechanism. The Photodiode Array (PDA) sensor collocated with an Avalanche Photodiode at the receiving section provides sustained information about the transmitter's movements and beam displacements while the received optical signal strength is continuously monitored. The feedback signals are transmitted to the FSM controller via a radio link. We demonstrate the capacity to stabilize a laser beam transmission in the presence of external disturbances and platform movements using a PDA sensor assisted control.

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On physical limit of wireless digital transmission from radio wave propagation perspective

Cited by 6 publications

References 13 publications

Communication Times Reconstruction in a Telecontrolled Client–Server Scheme: An Approach by Kalman Filter Applied to a Proprietary Real-Time Operating System and TCP/IP Protocol

Communication Times Reconstruction in a Telecontrolled Client–Server Scheme: An Approach by Kalman Filter Applied to a Proprietary Real-Time Operating System and TCP/IP Protocol

Optimization analysis of transmission characteristics of wireless energy transmission system based on dynamic tuning algorithm

Experimental Study on Photodiode Array Sensor Aided MEMS Fine Steering Mirror Control for Laser Communication Platforms

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