Abstract
We study the performance of a cooperative vehicular communication system in a highway traffic scenario, where the locations of co-channel interfering vehicles are modeled by a one-dimensional Poisson point process (PPP). Wireless channel modeling campaigns have shown that the statistical patterns of vehicle-to-vehicle (V2V) channels can often be modeled by the Weibull distribution. Due to the complex characteristics of random fading and interference, system performance analysis is involved. To address this issue, we establish a framework for performance analysis in vehicular networks under Weibull fading and one-dimensional Poisson field of interference, where the Weibull probability density function (PDF) is approximated by a finite exponential mixture. By this means, the approximation expressions of the successful/unsuccessful message transmission probabilities for both direct V2V communication and the three-node cooperative vehicular communication are derived through stochastic geometry. Monte-Carlo simulations verify the accuracy of our derivation, as well as the advantages of encouraging cooperation among vehicles. Our methods and results can potentially be used to facilitate stochastic geometric analysis in many other complex vehicular networks under Weibull fading.
Highlights
As one of the key components of intelligent transportation systems (ITS), vehicular networking allows enhancing the environment awareness level of drivers, and leads to great improvements in traffic safety and efficiency [1]
The results clearly demonstrate the advantages of seeking cooperation to improve the performance in vehicular communication networks, even with complex fading and interference issues
From the figure we can see that our approximation expressions well match simulation results, which verifies the accuracy of the results shown in Propositions 2 and 3
Summary
As one of the key components of intelligent transportation systems (ITS), vehicular networking allows enhancing the environment awareness level of drivers, and leads to great improvements in traffic safety and efficiency [1]. In most existing works, signal propagation between terminals is assumed to experience Rayleigh fading (e.g., [18]–[24]) This assumption permits to establish direct relationship between communication performance (normally successful transmission probability or error probability) and system parameters (such as transmission power and data rate, and intensity of interferers) due to the simple form of the channel gain distribution. Using the above method, we attain mathematical expressions that can accurately approximate the probabilities of successful/unsuccessful transmission for a direct V2V communication system in a highway traffic scenario It is shown, through numerical results, that the Weibull fading phenomenon leads to very different characteristics of system performance compared with conventional. R denotes the set of all real values. |A| denotes the cardinality of set A
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