Improving Vehicular Safety Through Constant Modulation: A Robust Solution for High-Mobility Scenarios

Abstract

This paper addresses the pressing global issue of road traffic safety, which results in an estimated 1.19 million fatalities annually, by leveraging the potential of the Wireless Access in Vehicular Environments (WAVE). The WAVE standard plays a critical role in reducing accidents by enabling communication between vehicles and infrastructure. The success of Vehicular Ad Hoc Networks (VANETs) in enhancing road safety relies heavily on the effective exchange of Cooperative Awareness Messages (CAMs) and Decentralized Environmental Notification Messages (DENMs). However, the mobility of vehicles introduces challenges due to the Doppler Effect (DE), which disrupts communication and message dissemination, particularly in high-mobility conditions. To mitigate this, we propose an existing simple strategy called Constant Modulation (Cte), designed to improve communication efficiency in VANETs under varying Doppler Shift conditions. Comparative evaluations show that Cte outperforms more advanced techniques like Auto Rate Fallback (ARF) and Adaptive Modulation and Coding (AMC), particularly under high Doppler Shift values of 750 Hz and 1500 Hz. The results indicate that Cte offers a robust, cost-effective solution for improving throughput, reducing transmission duration, and ensuring reliable safety message dissemination in dynamic VANET environments. Furthermore, Cte serves as a benchmark for future communication algorithms, making it a promising approach for enhancing road safety, especially in high-mobility scenarios.