This paper discusses the distributed coordination function (DCF) access mechanism which is a carrier sense multiple access with collision avoidance (CSMA/CA) scheme. Simulation projects for different DCF performance parameters have been built using the OPNET network simulator. The projects are mainly basic service set (BSS) topology simulated under different parameter values (data rate, fragmentation, RTS/CTS, number of nodes, and load condition). Simulation results show when the DCF access mechanism is better under what load condition, and how to choose the best fragmentation threshold and other access-mechanism specific parameters according to the network conditions. Simulation results were validated against a theoretically calculated maximum throughput (the simulation maximum throughput was about 70% of the theoretically calculated maximum throughput).
Autonomous unmanned aerial vehicles are one of the most important applications in modern technology. Otherwise known drones, these vehicles perform a lot of vital missions and sensitive tasks in scientific discoveries and agricultural and military applications. Drones that are in a network possess the freedom to roam in various directions. The security system of drones plays an important role in performing services. In this paper, a hybrid security system is proposed for drones to protect their data. This detection system is designed to protect autonomous drones from any attack. The proposed approach is implemented in a highway environment scenario. Our experimental results for the security system demonstrate that the proposed approach possesses an outstandingly accurate rate for intrusion detection.
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