Link control method for improving packet transmission efficiency for store and forward communications by LEO satellites

1996 ◽  
Vol 79 (9) ◽  
pp. 43-50 ◽  
Author(s):  
Tsuyoshi Nakayama ◽  
Naokazu Hamamoto
Keyword(s):  
Control Method ◽  
Transmission Efficiency ◽  
Packet Transmission ◽  
Leo Satellites ◽  
Store And Forward

scholarly journals Motor shifting and torque distribution control of a multi-motor driving system in electric construction vehicles

2021 ◽  
Vol 13 (6) ◽  
pp. 168781402110284
Author(s):  
Weikang Kong ◽  
Jixin Wang ◽  
Dewen Kong ◽  
Yuanying Cong ◽  
Shuangshi Feng
Keyword(s):  
Power Systems ◽  
Control Method ◽  
Simulation Analysis ◽  
Rapid Development ◽  
Transmission Efficiency ◽  
Torque Distribution ◽  
Driving System ◽  
Construction Machinery ◽  
Improve Energy Efficiency ◽  
Parameter Matching

With the rapid development of the world economic construction and the shortage of energy, it has become a hot research issue to realize the electrification of the vehicle driving system and improve energy efficiency. Most of the electric construction machinery power systems are characterized by low speed and high load. The coordinated driving of multiple motors can increase the output torque and improve the transmission efficiency of the machine on the basis of a compact layout. A novel configuration of electric construction vehicles based on multi-motor and single-speed and its driving torque distribution control method is presented in this paper. The detailed mathematical model is established and the simulation analysis is carried out based on it. The results show that the proposed multi-motor driving system with the control strategy can improve the overall efficiency in the condition of ensuring the driving force when the parameter matching and motors choosing reasonably.

A Customized IPv6 Header for Packet Transmission over a LAN

2010 ◽  
Vol 439-440 ◽  
pp. 1081-1086
Author(s):  
Hua Qing Zhou ◽  
Sheng Hui Dai
Keyword(s):  
Packet Loss ◽  
Transmission Efficiency ◽  
Compression Algorithm ◽  
Packet Transmission ◽  
New Method ◽  
Transmission Performance ◽  
Wireless Links ◽  
Header Compression

Header compression can effectively improve transmission efficiency, but existing header compression algorithm reduces the performance when operating over wireless links, because the differencing coding that the algorithm used does not adapt to packet over LAN. A new method for IPv6 header compression named is proposed, the compression is based on substitution and is not affected by packet loss. The method can significant improve the transmission performance over LAN.

A Generalized TCP Fairness Control Method for Multiple-Host Concurrent Communications in Elastic WLAN System Using Raspberry Pi Access Point

2020 ◽  
Vol 11 (2) ◽  
pp. 18-40
Author(s):  
Rahardhita Widyatra Sudibyo ◽  
Nobuo Funabiki ◽  
Minoru Kuribayashi ◽  
Kwenga Ismael Munene ◽  
Hendy Briantoro ◽  
...  
Keyword(s):  
Wireless Local Area Network ◽  
Local Area Network ◽  
Control Method ◽  
Access Point ◽  
Local Area ◽  
Packet Transmission ◽  
Raspberry Pi ◽  
Area Network ◽  
Traffic Demand ◽  
Tcp Fairness

The IEEE802.11n wireless local-area network (WLAN) has been widely adopted due to the flexible coverage and lower installation cost. However, the TCP throughput unfairness was detected when multiple hosts concurrently communicate with a single access-point (AP). Previously, the authors proposed the TCP fairness control method for only two hosts in the elastic WLAN system using Raspberry Pi AP, which dynamically adapts the topology according to the traffic demand. The delay is introduced in the packet transmission to the faster host from the AP, which is optimized by the PI feedback control such that the measured throughput becomes equal between the hosts. In this paper, the authors proposed a generalization of this method for any number of hosts by newly introducing the target throughput as the equal goal among the hosts. It is dynamically updated using the measured throughputs. The effectiveness of the proposal is verified through experiments using the elastic WLAN system testbed with one AP and up to four hosts.

scholarly journals Frequency tracking and tuning control of wireless power transfer system

2021 ◽  
Vol 2108 (1) ◽  
pp. 012023
Author(s):  
Ziyi Liu ◽  
Hao Zhan
Keyword(s):  
Control Method ◽  
Wireless Power Transfer ◽  
Transmission Efficiency ◽  
Resonant Circuit ◽  
Power Transfer ◽  
Wireless Power ◽  
Frequency Tracking ◽  
Simulink Simulation ◽  
Impedance Characteristics ◽  
High Control

Abstract A tuning control method with frequency tracking function is proposed to improve the degradation of efficiency caused by coil detuning in magnetically-coupled resonant wireless power transfer. Firstly, the detuning mechanism is studied by combining the AC impedance characteristics of the series resonant circuit, and the feedback control circuit is constructed by using a modified phase-locked loop, which outputs a variable frequency PWM wave to regulate the operating frequency of the high frequency inverter and maintains the phase difference between the inverter output voltage and the original side current within the error range. The Matlab/Simulink simulation results show that the design can successfully transfer the system to a new resonant state with short regulation period and high control accuracy, which can effectively improve the transmission efficiency and load power of the system.

scholarly journals A Practical Packet Transmission Control Method for HDTV Contents Distribution Using IP Multicast

2006 ◽  
Vol 60 (9) ◽  
pp. 1483-1489
Author(s):  
Kazuhiro Kamimura ◽  
Teruyuki Hasegawa ◽  
Haruo Hoshino ◽  
Shigehiro Ano ◽  
Toru Hasegawa
Keyword(s):  
Control Method ◽  
Packet Transmission ◽  
Ip Multicast ◽  
Transmission Control

Simulation Research on One-Cycle Controlled AC-AC Cuk Converter

2013 ◽  
Vol 710 ◽  
pp. 501-505
Author(s):  
Chun Jie Wang ◽  
Peng Fei Yu
Keyword(s):  
Control Method ◽  
Input Voltage ◽  
Transmission Efficiency ◽  
Open Loop ◽  
Open Loop Control ◽  
Simulation Research ◽  
Loop Control ◽  
Cuk Converter ◽  
Excellent Control ◽  
And Control

AC-AC Cuk Converter which constituted by bidirectional switch has an advantage of high transmission efficiency, but most of them usually use open-loop control. In this paper, we propose one-cycle control of the AC-AC Cuk converter. The operating principle and control method are presented. The simulation results based on Matlab are given to verify its rationality and feasibility. Compared to common PID control, it has excellent control performance. Furthermore, one-cycle controlled AC-AC Cuk converter has the ability to reject input voltage perturbations and faster dynamic response.

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