In this paper coexistence and spectrum sharing between systems as a recently critical issue due to emerging new wireless technologies and spectrum scarcity are investigated. At World Radiocommunication Conferences 2007 (WRC-07), International Telecommunication Union Radiocommunications (ITU-R) allocated 3400-3600 MHz band for the coming fourth generation (4G) or IMT-Advanced on a co-primary bas...

and existing fixed wireless access (FWA) systems is studied. Spectral emission mask is used as well as interference to noise ratio (I/N) of-6 dB as one of standard sharing criterion value at FWA systems recommended by international telecommunication union radio sector ITU-R. Three channel bandwidths of (3.5, 7, and 10 MHz) of WiMAX system are selected to be studied with 7 MHz FWA channel in den...

This paper describes the application of a joint source channel decoding technique (JSCD) of variable length codes (VLCs), presented at first by Guivarch et al., in the context of future public land mobile telecommunication systems (FPLMTS) involving UMTS channel codes and OFDM modulation. OFDM parameter sets have been adjusted both to the UMTS chip rate and to the selectivity of the urban multi...

Low-Earth Orbit (LEO) satellite systems are intended to have an important part of the future generation of mobile telecommunication systems. They aim to provide di erent services to various populations of users. Each class of users requires a certain Quality of Service (QoS) and thus a given part of the shared channel resource. In this paper, LEO satellite systems based on an earthxed cell conc...

This paper shows how an engineer could write a full formal description of the service layer of a telecommunication system, organized according to the Distributed Feature Composition virtual architecture. Descriptions in Promela and Z can be composed using a joint semantics based on the transition-axiom method. The described system can be reasoned about in several ways, including use of tools de...

this study seeks to examine how a company can select the best intermediary for its marketing channels with minimum of criteria and time. a theoretical framework is proposed based on the most important tasks of intermediary and the criteria to measure them. there are four basic tasks and thirty criteria in three independent levels. subsequently, an exploratory case study in iranian food industry...

Information theory and analytical methods play a central role in the networking technology. It identifies the key parameter that must be quantified in order to characterize the performance of a network. The analytical information theory is part of the foundations of the Hipercom project. This is a tool box that has been collected and adapted from the areas of the analysis of algorithms and the ...

Modern telecommunication equipment differs quite significantly from equipment used in the past. While in traditional networks the behaviour of each transmission channel was deterministic, modern transmission systems may behave nonlinear and time variant even during a call. Signal processing is used extensively, mostly at the end points of a connection. The impairments introduced by the transmis...

Multicast transmission is one of the major goals for Universal Mobile Telecommunication System (UMTS) that motivated the 3 Generation Partnership Project (3GPP) to launch the Multimedia Broadcast/Multicast Service (MBMS) framework. MBMS constitutes a significant step towards the so-called Mobile Broadband, since it allows the efficient utilization of network and radio resources. One of most imp...

Problems of multiservice network modeling on the basis of hybrid methods – methods of graph theory and queue system are considered in the article. Model NGN-network is presented in the form of exponential Petri net. For calculation of probabilistic and time characteristics of network on the basis of Petri net analytical expression was received. On the basis of this expression calculation of tim...