tailieunhanh - báo cáo hóa học:" Connectivity analysis of one-dimensional vehicular ad hoc networks in fading channels"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Connectivity analysis of one-dimensional vehicular ad hoc networks in fading channels | 1 Connectivity analysis of one-dimensional vehicular ad hoc networks in fading channels Neelakantan Pattathil Chandrasekharamenon and Babu AnchareV Department of Electronics and Communication Engineering National Institute of Technology Calicut 673601 India Corresponding author neelakantan_pc@ Email address AVB babu@ Abstract Vehicular ad hoc network VANET is a type of promising application-oriented network deployed along a highway for safety and emergency information delivery entertainment data collection and communication. In this paper we present an analytical model to investigate the connectivity properties of one-dimensional VANETs in the presence of channel randomness from a queuing theoretic perspective. Connectivity is one of the most important issues in VANETs to ensure reliable dissemination of time-critical information. The effect of channel randomness caused by fading is incorporated into the analysis by modeling the transmission range of each vehicle as a random variable. With exponentially distributed inter-vehicle distances we use an equivalent M G 1 queue for the connectivity analysis. Assuming that the network consists of a large number of finite clusters we obtain analytical expressions for the average connectivity distance and the expected number of vehicles in a connected cluster taking into account the underlying wireless channel. Three different fading models are considered for the analysis Rayleigh Rician and Weibull. The effect of log normal shadow fading is also analyzed. A distancedependent power law model is used to represent the path loss in the channel. Further the speed of each vehicle on the highway is assumed to be a Gaussian distributed random variable. The analytical model is useful to assess VANET connectivity properties in a fading channel. Keywords connectivity distance fading channels highway vehicle speed vehicular ad hoc networks. 2 1. Introduction Vehicular Ad Hoc Networks VANETs which allow vehicles to .