Evaluation of DS/SS-IVC based on location oriented code allocation considering propagation delay

In this paper, performance of the DS/SS-IVC based on location oriented spreading code allocation is evaluated. In the conventional studies, the use of the Hadamard codes as spreading codes in DS/SS-IVC was proposed and the communication performance was improved because of the orthogonality of the codes. In the conventional studies, it was assumed that the slot synchronization of slotted ALOHA is ideal by using time synchronization of GPS or beacon for synchronism. However, under the actual situations, receiving chip timing of the spreading code is different because vehicles are locating at different positions. As the results, orthogonality of each code is distorted and performance degradation might be caused. Therefore, this study investigates the influence of the propagation delay. The influence of the propagation delay in DS/SS-IVC is evaluated by simulations.