Adaptive modulation method of beacons in HiperLAN／2 communication channel
1. School of Computer Science and Communication Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China; 2. School of Automotive and Transportation Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China
Abstract：To solve the traffic safety problem, the proactive safety applications in internet of vehicles（IoV）were investigated. The distribution of packet delivery rate (PDR) and transmission time delay of beacon was analyzed under the traditional modulation and coding mode. Considering the demands for secure application of IoV, the beacon adaptive modulation method was proposed based on channel estimation. The beacon transceiver system for IoV was established based on HiperLAN/2 channel model. By measuring the real-time fading of each subcarrier, the modulation coding methods were adaptively allocated. The communication parameters of traditional modulation and new modulation method in the system were compared， and the influence of beacon packet format on the new modulation method was analyzed. The results show that PDR and latency of the new method are better than those of traditional methods. The proposed method can adapt to the commonly used formats of data packet with improved real-time transmission quality of beacon data and can meet the requirements of proactive security in IoV.
2019, Vol. 40 
