Summary: | 碩士 === 國立高雄師範大學 === 光電與通訊工程學系 === 104 === Abstract
Vehicular ad hoc networks are one of the main developments in recent years. It not only provides traffic information, but also helps to enhance traffic safety and convenience. Hybrid spectrum access scheme is a scheme which focuses on energy efficiency in a vehi-cle-to-infrastructure uplink communication scenario in cognitive ve-hicular ad hoc networks. Based on the location information and con-sider the path loss exponent of the channel between a vehicle and an access point, vehicle selects different access schemes adaptively and detects optimal spectrum bands for transmission to minimize the overall energy consumption. According to the scheme above, we pro-pose a dual antenna design which combined with Wi-Fi that allow the vehicle to transfer data to relay car and infrastructure at the same time, which elongate available time and further reduce energy consumption. In addition, we also find out the proper distance with the relay car by comparing and analyzing large amounts of numerical results. In order to achieve the best energy efficiency, the best relay car can be available by pre-established table in different distance between the sender and infrastructure.
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