M. Asif Ali Haider

Performance analysis of VANETs under Rayleigh, Rician, Nakagami-m and Weibull fading

Vehicular Ad-hoc Networks (VANETs) are considered as one of the promising technologies for reduction of accidents and provisioning of infotainment services on the road. Due to high mobility of vehicles, wireless channel response rapidly changes from time to time which results into random fading. Therefore, this paper provides in depth analysis of performance of VANETs under different fading channels. To be specific, we adopt the cluster based approach to analytically model VANETs. Closed-form expressions of packet loss probability for different fading (i.e. Rayleigh, Rician, Nakagami-m and Weibull channel) models have been provided considering both MAC and Physical Layer characteristics. The derived expressions also encompass the effect of decoding failure and packet collision based on signal to noise ratio (SNR) and back-off timer, respectively. Our results characterizes the impact of channel conditions, vehicle speed, and contention window on the performance of the cluster based VANETs. Extensive simulations are performed to verify our findings.

High SNR analysis of inter-body interference in Body Area Networks

Wireless Body Area Networks (BANs) have drawn significant attention of research community all over the world due to their applications in healthcare. This paper adopts the cluster based approach to analytically model the implications of inter-body interference in BANs. To be specific, we derive exact closed-form expression for outage probability for co-channel interference under Rayleigh and Rician fading. We consider two cases, where in first case channel between sensors and cluster head is Rice distributed and channel between main and interfering cluster head is Rayleigh distributed. In second case, channel between sensors and cluster head is Rayleigh distributed and channel between main and interfering cluster head is Rice distributed. We also evaluate the significance of Rician-K factor for both cases. Extensive simulations are performed to validate our findings which clearly show the effect of inter-body interference on the performance of BANs.