Increasing Guard Band Size to Decrease Interference in V2X Communication

As technologies evolve and new devices are introduced, the demand for fast and reliable vehicle-to-everything (V2X) communication increases. As this demand increases, the inter-ference level in the 5.9GHz Dedicated Short Range Communications (DSRC) band will inevitably increase. Thus, the task of somehow minimizing this interference becomes increasingly important as time passes. This report investigates the effects of increasing the guard band size of the lower 5.9 GHz DSRC band on the adjacent channel interference from Unlicensed National Information Infrastructure 4 band (U- NII-4) devices and to determine whether there is a significant decrease in interference levels. The changes in the interference levels are being measured through packet reception rate (PRR) in vehicle-to-infrastructure (V2I) communication and infrastructure-to-vehicle communication (I2V). Experimental observations in lab using 45 low-cost U-NII-4 devices have shown a significant increase in PRR when shifting the central frequency of these devices for both V2I and I2V communications.