Due to the unavoidable use of mobile phone and another data communication as a result we face the problem of spectrum scarcity. Within the current spectrum regulatory framework, however, all of the frequency bands are exclusively allocated to specific services and no violation from unlicensed users is allowed.But as we know that most of the time band is either not utilized or underutilized. The...

The uplink inter-cell interference is a major impairment in wireless systems. In this paper, we provide a geometrical-based framework for its analysis in networks with convex polygonal coverage area. Algebraic expressions for the Angle-of-Arrival (AoA) statistics of the uplink interfering signals are obtained. Simulation results validate the model. Representative examples show the dependence of...

This work presents a scalable and high performance prediction protocol for optical networks. In the proposed protocol, we develop a mathematical model to maintain the stability of a network system by prediction based on the traffic temporal locality property. All the critical factors, including transceiver tuning time, propagation delay, and processing time for dealing with control packets, are...

Two-tier overlay networks that consist of a conventional macrocell network and femtocell hotspots offer an economical solution for high capacity and extended coverage. However, wireless interference across tiers significantly degrades network performance by restricting spectrum reuse. In this paper, we explore schemes to mitigate cross-tier interference using beamforming in overlay networks. In...

In this paper, we present a new iterative method with order of convergence eighth for solving nonlinear equations. Periteration this method requires three evaluations of the function and one evaluation of its first derivative. A general error analysis providing the eighth order of convergence is given. Several numerical examples are given to illustrate the efficiency and performance of the new ...

content discovery is one of the fundamental issues that determines the architecture and performance of content distribution networks based on peer-to-peer (p2p) networks. to administrate the costs and discoveries, peers of a p2p network communicate with each other by one or more overlay layers. the condition of node’s relations in overlay networks, have a great impact in efficiency of networks....

The non-cooperative two-stage network DEA approach requires the assumption as to whether the first or second stage is the leader or follower. In many real-world situations such as evaluating sustainable design performances, however, information about the leader (dominant) stage is often unavailable as a firm ׳s internal decision process may not be observable for outsiders. In the current study,...

A Multiple-Input Multiple-Output (MIMO) transceiver provides extremely high spectral efficiencies by simultaneously transmitting multiple data streams in the same channel. MIMO links with MIMO transceiver at each end have been used to raise data rate or reduce energy consumption at links in a wireless sensor network (WSN). In this paper, we investigate the approach of cross-layer design for lev...

Today's cellular wireless networks must meet increasing challenges of handling a larger demand for service without a loss of quality, by maximizing the spectral efficiency of the network. Therefore, performance evaluation and modeling of cellular wireless networks is considered to be an important issue to overcome the problem of limited resources of the network. MOSEL-2 (MOdelling Specification...

Wireless sensor network (WSN) is a new development of wireless network technology. WSN consists of many wireless devices cooperating with one or more sensors to monitor physical or environmental conditions. Each node has several constraints on resources such as energy, computational cost and wireless bandwidth. Therefore, it is not a good strategy for always sending packets to the sink node of ...