Optimum reference distance based path loss exponent determination for vehicle-to-vehicle communication

Abstract

Vehicle-to-vehicle (V2V) communication environment differs from classical wireless communication with respect to low antenna heights and high mobility. Therefore, V2V channel modeling based on real measurements is still crucial to get the channel parameters for the various road environments. One of the most extracted parameters from measurements is path loss exponent and selecting a fixed reference distance value in obtaining this parameter may also cause remarkable fitting errors. Thus, in this study, least square method-based approach for the best-fitted path loss exponent calculation was proposed by determining the optimum reference distance value from the V2V channel measurements. First, V2V channel measurements were carried out with commercially available DSRC OBU devices for six different highway scenarios in Gümüşhane, Turkey. Then, path loss exponents both for some fixed reference distance values in the literature and for the optimum reference distance values from our proposed approach were calculated and compared. Best-fitted path loss exponent values were obtained as 1.39-2.60 for the optimum reference distances determined using the proposed approach. The findings clearly show that the path loss exponents obtained with our proposed approach fit the measured data better than the results of fixed reference distance values.

Vehicle-to-vehicle communication channel measurements on a vertical curve road

“…This may cause deviation in path loss exponent value. Related to this problem, we proposed an approach in [17] to find optimum reference distance based on measurement data. According to this approach, the reference distance is chosen as minimum distance value in measurement data.…”