Scientific Research Publishing

Read  full  paper  at: http://www.scirp.org/journal/PaperInformation.aspx?PaperID=15#.VNMu8yzQrzE Author(s)   Irfan AHMED , Mugen PENG , Wenbo WANG Affiliation(s) Wireless Signal Processing and Network Lab Beijing University of Posts and Telecommunications, Beijing, P.R.China . Wireless Signal Processing and Network Lab Beijing University of Posts and Telecommunications, Beijing, P.R.China . Wireless Signal Processing and Network Lab Beijing University of Posts and Telecommunications, Beijing, P.R.China . ABSTRACT Energy efficiency and enhanced backbone capacity is obtained by exploiting the geometric orientation of cooperative nodes in wireless sensor network. The cooperative communication in wireless sensor networks (WSN) gives us leverage to get the inherent advantages of its random node’s locations and the direction of the data flow. Depending on the channel conditions and the transmission distance, the number of cooperative nodes ...

Read  full  paper  at: http://www.scirp.org/journal/PaperInformation.aspx?PaperID=53321#.VLys_cnQrzE Author(s)     Amr A. Fahmy 1 , Asmaa M. Saafan 2 , Hesham M. El-Badawy 2 , Salwa El-Ramly 1   Affiliation(s) 1 Faculty of Engineering, Ain-Shams University, Cairo, Egypt . 2 National Telecommunication Institute (NTI), Cairo, Egypt . ABSTRACT Recently, several approaches were followed for the enhancement and better resource utilization in mobile networks; this is to achieve energy efficient consumption for production and delivery of an information bit. Using Cognitive Femto cells (as a member of the small base stations’ family) proves that, it is an efficient solution for achieving this goal[1]. The use of Energy Efficiency term  η  has become one of the major indices for measuring the performance of these systems. η  is the measure of the overall system Capacity ( C ) in bps/Hz versus the Consumed Energy ( ...