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    Intelligent indoor nitrogen dioxide sensors network based FSO communication
    (Aksaray Üniversitesi Fen Bilimleri Enstitüsü, 2021) Ali, Mohammed Hussein; Yenice, Yusuf Erkan
    The Intelligent Wireless Sensor Network (IWSN) is one of the widely used applications in present time, whereas it is utilized for: 1) sensing of the natural phenomenon or environmental conditions that occur in our world, 2) processing the incoming data from their sensors, 3) presenting a appropriate decision according to the entered data. In this work, an Intelligent Wireless Sensor Network has been designed and implemented, which can be used for applications of carbon monoxide gas sensing, it involves three main parts, the intelligent system, the sensor interface unit, and the wireless communication system. The proposed intelligent system has been utilized to processing the incoming data from carbon monoxide sensors, then presenting the average value of these data. The sensor interface unit has been used for converting the incoming analog signals from the nitrogen dioxide sensors to binary data that should be driven to the intelligent system, where the last one should be saved in FPGA (Field Programmable Gate Array). The wireless communication system has been implemented for transferring the digital data between the sensor node and the intelligent system for remote distances. A Back-Propagation neural network has been utilized as an intelligent system for this work, three layers had been designed in this network, input, single hidden, and output layers. This network has been trained by several training functions, and has used two linear activation functions, the SATLINS function for the hidden layer, and the SATLIN for the output layer. Using TRAINPSO (Particle Swarm Optimization) training function, an optimal result has been also presented, but with reaching the MSE to zero value in 46 iteration using of only three neurons in the hidden layer. A laser FSO(Free-Space-Optical) system has been designed and implemented as a wireless communication unit for the proposed system, cause this technique possesses low power consumption and high bandwidth, directivity, immunity than other techniques for same range of transmission. The ON/OFF keying modulation has been used in this technique for modulating the digital data of the sensor units with an infra-red laser light carrier, which is a powerful widely used modulation technique in the laser communication systems.