Abstract—This paper proposes a vehicle-to-vehicle propagation model implemented with SDL. To estimate the channel characteristics for Inter-Vehicle communication, we first define a predicted propagation pathloss between the moving vehicles under three typical scenarios. A Ray-tracing method is used for the simple gamma model performance. Keywords—Inter-vehicle communication (IVC), propagation model, road traffic, road vicinity, pathloss. I. INTRODUCTION ECENTLY, many research group have concentrated their work on new generation systems in vehicular environments like DSRC system [4] , the FleetNet project [5], CarNet project [6], etc.. Disseminating warning messages through the vehicular network, providing traffic information services and connecting vehicles to the internet are the main goals of the development of such systems. The most effective method to exchange this information is through inter-vehicle communication (IVC). Vehicle-to-vehicle communications demonstrate properties of two network types: Peer-to-Peer network and Ad Hoc network. In so-called inter-vehicle communication, vehicles are equipped with computer controlled radio modems allowing them to contact other equipped vehicles in their vicinity. By exchanging information, vehicles build knowledge about the local traffic situation which can improve comfort and safety in driving [3]. Given the mobility of vehicles on the road, the network topology changes constantly so as the received power. This Manuscript received October 25, 2005. This work was supported in part by the Institute for Communications Engineering of the University of Hanover (IANT). M. Frikha is with the Telecommunications School of Engineering (SUPCOM), Ariana, El Ghazala City Road of Raoued 2083 Tunisia (phone: +21698348148; fax: +2161856829; e-mail: m.frikha@supcom.rnu.tn). M. Meincke, is with the Institute for Communications Engineering of the University Hanover (IANT) - Appelstrasse 9a, 30167 Hanover Germany (e- mail: meincke@ant.uni-hannover.de). S. Barouni is with the Telecommunications School of Engineering (SUPCOM), Ariana, El Ghazala City Road of Raoued 2083 Tunisia (e-mail: semia1@lycos.com). involves that there is a relation between the received power and the environment which surrounds the communicating nodes (road traffic {density of traffic and velocity of vehicles} and road surrounding {urban, sub-urban, rural environment}). II. DESCRIPTION OF SCENARIOS Taking the inspiration from the starting points [1] and [2], we defined three typical scenarios under different road types, different traffic density and different vehicular mobility. A. Scenario 1 We imagine this scenario as a freeway, as depicted in figure1, an open environment with a low traffic density. As only few vehicles are travelling on the highway, vehicles are travelling at high speeds and there is no obstacle between transmitter and receiver. Fig. 1 A freeway with low traffic density We postulate that the received signal in this scenario is a sum of two components: line-of-sight and ground-reflected (two-ray model). Using the formula of the two-ray from [7], the total received power field r P is expressed as 4 2 / . . . . r H H G G P P r t t r t r (1) Thus, the path loss, expressed in dB, is given by the following equation r t t r t p H H G G P r L . log . 2 log log log . 10 log 40 (2) Where t H and r H are the heights of transmitter and receiver antenna, r is the ground distance between transmitter and receiver, and t G and r G are transmitter and receiver antenna power gains. B. Scenario 2 Unlike in scenario 1, we assume that there is no direct path Mounir Frikha, Michael Meincke, and Semia Barouni Definition and Implementation of a Simulation Model for the Physical Layer and the Radio Channel in Dedicated Short Range Communication Systems R World Academy of Science, Engineering and Technology International Journal of Electrical, Electronic Science and Engineering Vol:1 No:9, 2007 1236 International Science Index 9, 2007 waset.org/publications/5870