Scientific Research Publishing

Read  full  paper  at: http://www.scirp.org/journal/PaperInformation.aspx?PaperID=6#.VNMsPizQrzE Author(s)   Chong SHEN , Susan REA , Dirk PESCH Affiliation(s) Centre for Adaptive Wireless Systems, Department of Electronic Engineering Cork Institute of Technology Ireland . Centre for Adaptive Wireless Systems, Department of Electronic Engineering Cork Institute of Technology Ireland . Centre for Adaptive Wireless Systems, Department of Electronic Engineering Cork Institute of Technology Ireland . ABSTRACT In this paper we present an adaptive distributed cross-layer routing algorithm (ADCR) for hybrid wireless network with dedicated relay stations (HWN*). To support versatile multimedia communication for Mobile Terminals (MTs), the HWN* integrates a cellular network, an ad hoc network and fixed relay nodes (RNs). A MT may borrow cellular data channels that are available thousands mile away via secure multi-hop RNs, where RNs are placed...

Read  fulll  paper  at: http://www.scirp.org/journal/PaperInformation.aspx?PaperID=2#.VNMppizQrzE Author(s)  Youssef FAKHRI , Benayad NSIRI , Driss ABOUTAJDINE , Josep VIDAL Affiliation(s) 1University Mohamed V-Agdal Faculty of Sciences, UFR Informatics and Telecommunication B.P. 1014 Rabat, Maroc . Faculty Ain Chok ,UFR Signal Processing ,University Hassan II, B.P. 5366 Casablanca, Maroc . University Mohamed V-Agdal Faculty of Sciences, UFR Informatics and Telecommunication B.P. 1014 Rabat, Maroc . University of Catalonia Dept. of Signal Theory and Communications Campus Nord,Modul D5, C/ Jordi Girona 1-3, Espagne . ABSTRACT This paper presents a scheduling scheme for packet transmission in OFDM wireless system with adaptive techniques.The concept of efficient transmission capacity is introduced to make scheduling decisions based on channel conditions.We present a mathematical technique for determining the optimum transmission rate, packet s...

Read full paper at: http://www.scirp.org/journal/PaperInformation.aspx?PaperID=51144#.VFbftWfHRK0 Author(s)      Syyed Javad Mohammadi Baygi , Mehran Mokhtari Affiliation(s) Department of Computer Engineering, Islamic Azad University, Damghan Branch, Damghan, Iran . ABSTRACT Standards can define the performance and required protocols in different types of nodes in Wireless Sensor Networks (WSNs). In this article we discuss the Quality of Service (QoS) requirements in WSNs and present a survey of some of the QoS multi-parameters metrics in WSNs. Also, it gives the performance of 802.15.4, LEACH, and CBRP protocol considering parameters. The simulation tests were carried out by the simulato...

Read full paper at: http://www.scirp.org/journal/PaperInformation.aspx?PaperID=50871#.VE7_O1fHRK0 Author(s) Sundhar Arumugam 1 , Dananjayan Perumal 2 Affiliation(s) 1 Department of Electronics and Communication Engineering, Perunthalaivar Kamarajar Institute of Engineering and Technology, Karaikal, India . 2 Department of Electronics and Communication Engineering, Pondicherry Engineering College, Pondicherry, India . ABSTRACT Continuous increase in demand of wireless services such as voice, data and multimedia is fueling the need of spectrally efficient techniques in communication networks. The MCCDMA-MIMO, a system of Multi Carrier Code Division Multiple Access (MCCDMA) technique with multiple antennas at bot...