Performance analysis of smartphone based real-time driver system over IEEE 802.11 wireless networks

Wong , Chee Yin (2013) Performance analysis of smartphone based real-time driver system over IEEE 802.11 wireless networks. Project Report. UTeM. (Submitted)

Text PERFORMANCE ANALYSIS OF SMARTPHONE BASED REAL-TIME 24pages.pdf Download (4MB)

Abstract

When a car is just behind the truck, car driver's view is blocked by the truck in front. Since the distance between the truck and car is about a length of a car, only the truck is viewed by car driver, but not the incoming traffic. Car driver cannot determine whether it is a suitable time for safely overtaking. A driver assisting system is proposed for this scenario. Two smartphones are needed in the proposed driver assisting system. Smartphone A is placed in the truck while Smartphone B is placed in the car. Truck driver's view is captured using Smartphone A and sending out. Smartphone Bis used by car driver to receive view shared by Smartphone A to extend the view. Therefore, car driver will know the reason causing the slow moving truck in front. Car driver can then decide and able to make safely overtaking decision. However, this video transmission must be in real-time with over the inherently non real-time wireless communication channel. This means that the Wi-Fi link performance has to be able to determine in realtime by the receiver smartphone, to make sure that data is smoothly transferred with throughput of l Mbps. No video shall be displayed by the receiver smartphone if the link is not able to stream the video at the required data throughput. The investigation processes involved firstly determine the expected working distance for this proposed driver assisting system. Then, the expected throughputs for both vehicles in static and moving conditions including the Doppler effect are figured determined. Throughput between smartphones and PC is measured using Iperf. Experiment is carried out to ensure it throughput around 1 Mbps can be obtained in real scenario. The obtained measurement result using the developed application shows the similar measurement as obtained with the Iperf. The actual per\ormance of the Wi-Fi link in real-time, which is a good indication to alert user with the stability of the inherently non real-time characteristics of Wi-Fi channel, can then be determined through the develop application with the calculation on packets received and packet lost at the receiver. The result obtained from the designed and constructed application not only can give measurement as lperf, but also allow custom data (for instance, messages in this case or video image for further development of deiver assisting system) to be transmitted.

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