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Multi-source Network-coded D2D Cooperative Content Distribution Systems
Weijun Xing,Fuqiang Liu,Chao Wang,Ming Xiao,Ping Wang 한국통신학회 2018 Journal of communications and networks Vol.20 No.1
In this paper, we investigate the information transmissionin a typical 5G device-to-device (D2D) communication applicationscenario, i.e., a content distribution system with a numberof information sources intending to broadcast their messages tomultiple destinations in the vicinity. Due to the dynamic natureof wireless signal propagation links, it is hard to guarantee a satisfactoryperformance by direct source-destination transmissions,especially when the system is operating in a reuse-mode. Relays canbe introduced to the system to solve this problem. However, adoptingthe conventional repetition coding at relays inefficiently utilizesthe available resources, for the considered multi-source scenario. Therefore, we investigate applying a class of finite-field networkcodes at the relays, when potentially three types of relays are deployedto assist the information distribution process. We proposedthe algorithms to derive the system outage probability and analyzethe trade-off between energy efficiency and spectral efficiency. Ouranalytical and numerical results clearly demonstrate the potentialof exploiting network-coded cooperative communications in future5G D2D systems.
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Research of high response control technology of a moving coil electromechanical converter
Gong Zhang,Zheng Xu,Weijun Wang,Zhichen Hou,Xing Gu,Ning Lin,Liangwei Luo,Jing Huang 제어로봇시스템학회 2016 제어로봇시스템학회 국제학술대회 논문집 Vol.2016 No.10
Electromechanical converters (EMCs) are regarded as the most widely employed linear motion mechanism in various industry driving fields. This study tries to improve the characteristics deficiency of a moving coil electro-mechanical converter (MC-EMC), such as the output electromagnetic force, response time and response speed, and based on the time constant and currents are effected by inductance and resistance of the transformation coils, the carrying current coils of MC-EMC are adopted a transformation of segmentation and combination. The mathematical model and simulation for the response time, displacement, output electromagnetic force, acceleration of MC-EMC are proposed respectively. Results show that compared coils in parallel divided into three sections with coils in single group, the displacement step response time is reduced from 14.6㎳ to 9.94㎳ the response speed is over doubled, and electromagnetic force is raised about 8 times, the acceleration is increased by 8.7 times, the peak response time is reduced about 0.5 times, which means the design MC-EMC could realize the performance of short response time and high electromagnetic force, and display good prospects.
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