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Listen-Before-Talk category 4 (LBT Cat4) mechanism is considered as the most appropriate access method for Licensed-Assisted Access (LAA) framework, especially when LAA system coexists with WiFi system in unlicensed bands. Previous investigations of the LBT Cat4 based LAA-WiFi coexistence provide experimental results and simulation results, and theoretical analysis work is relatively rare. This work...
The wave-plate model is frequently used to analyze the signal of polarization time domain reflectometry (POTDR). However, since the wave-plate model is initially developed to simulate the polarization property of optical fiber communication links, it does not describe the signal of POTDR very well. In this paper, we adapt the wave-plate model for the simulation of POTDR. According to the comparison...
Wireless Sensor Networks (WSN) represent a new dimension in the field of networking. In this paper, an improved Genetic Algorithm is applied to the design of high performance multi-path routing protocol of WSN at the first time. The Algorithm consists of two stages: single-parent evolution and population evolution. The initial population is formed in the stage of single-parent evolution by using gene...
Flight safety is an important problem in aviation industry and flight accidents are the result of multi-elements which affect each other. In order to analyze the development process of flight accidents, from the view of system safety, the flight process was abstracted to a hybrid dynamic system based on discrete event dynamic system theory, and a systemic causal simulation model is discussed. Through...
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