Vehicle to Vehicle (V2V) and Vehicle to Infrastructure (V2I) communication systems, known as V2X technologies, have\nincreasingly attracted attention in current research on road safety and traffic ergonomics. The performance evaluation of these\ncommunication systems is an important step before their potential integration and use in real systems. V2X communications are\nbased on the IEEE 802.11p standard also known asWireless Access in Vehicular Environment (WAVE). V2X can affect human life;\ntherefore a deep study related to V2X performance evaluation should be done in order to be sure about the systemreliability. In this\ncontext, we have elaborated a deep study related to the effect of transmission range on V2X communications by considering the\nterminal mobility. First, we have evaluated the performance of the PHY layer on the IEEE 802.11p using simulation. Secondly, we\nhave conducted real casemeasurements using the Arada LocoMate Transmission system.Theobtained results shows the necessity to\noptimize the quality of transmission in V2X communications. Consequently, we propose in this paper a new comb-pilot technique\nto enhance the quality of Orthogonal Frequency Division Multiplexing (OFDM) transmission. Our proposal consists in two new\nuses of the pilot subcarrier estimation technique in order to decrease the elevated bit error rate (BER). The quality of transmission\n(QoT) is first evaluated relating to the pilot symbol rearranged positions. Second, we proposed to optimize the QoT by adding two\nsupplementary pilot symbols as it can offer better channel estimation results. Based on the performance evaluation of our proposal,\nit is confirmed that both of rearrangement and the adding of the pilot patterns lead to performance enhancement compared to\nbaseline model (standardized one).
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