Abstract — In this paper, we investigate the outage performance of cognitive wireless relay networks where source nodes communicate to their destinations via multiple hops facilitated by intermediate cognitive nodes able to acquire spectrum holes. Specifically, we consider a model that consists

Abstract: The analysis the outage performance of suggested Cognitive Wireless Relay Network (CWRN) which consists of a source, a destination and M cognitive relay nodes and M primary user nodes. In this study, we mainly study that the cognitive relay nodes impact on the outage performance

Abstract—In this paper, we utilize stochastic geometry to analyze the primary service (PS) outage performance for spectrum sharing in Rayleigh fading environment. Using this approach, the impacts of the secondary service (SS) parameters and wireless environment on the PS outage probability

the destination terminal. We develop performance characterizations in terms of outage events and associated outage probabilities, which measure robustness of the transmissions to fading, focusing on the high signal-to-noise ratio (SNR) regime. Except for fixed decode-and-forward, all of our cooperative diversity

We quantify the average performance of digital transmissions over fading channels at high signal-to-noise ratio (SNR). The performance citeria considered here are probability of error and outage probability. We show that as functions of the average SN-R, they can both be characterized by two

In this paper, the performance of cellular systems is studied, in terms of average and worst-case outage probability. The approach is based on a new analysis which allows to take into account the assignment of a mobile to the most favorable cell site, instead of the closest one. Other features

at the terminal station with the use of various signal processing techniques. The subject of this paper is to present physical statistical models for the evaluation of the outage probability of a dual-HAP orbital diversity system using either SC (selection combining) or MRC (maximal ratio combining) techniques

Abstract Cellular frequency reuse is known to be an efficient method to allow many wireless telephone subscribers to share the same frequency band. However, frequency reuse laeds to mutual interference among co-channel cells. We review the technique for computing and modelling link performance

that both the maximum transmit power limit and the interference power constraint cause the outage saturation phenomenon, and more relays for secondary system can provide better outage performance. Index Terms—Congtive relay networks, outage probability, spectrum sharing, outage saturation phenomenon. I.

The cognitive network allows the unlicensed user to access the licensed spectrum to enhance spectrum utilization. In this paper we make an attempt to enhance the outage performance of the cognitive user by incorporating multiple antenna and maximal ratio combining (MRC) scheme at the cognitive user