ملخص الدراسة: Orthogonal frequency-division multiplexing (OFDM) systems suffer from significant out-of-band (OOB) radiation. All existing techniques have several drawbacks as wasting spectral or time resources. Time domain windowing is a well-known technique where an extended smoothing window is multiplied by the modulated signal. This window reduces the signal spectrum sidelobes, however, it extends the resource […]

ملخص الدراسة: In this work, dispersion characteristics and sensitivity of the propagation of TM surface plasmon through the proposed waveguide sensor. The proposed sensor containing a graphene at a finite distance filled with metamaterials (MTM) from plasmonic layer and sandwiched by dielectric layers. We numerically demonstrate the proposed waveguide structure as a novel graphene surface […]

ملخص الدراسة: The characteristics of a three-layer waveguide is studied. The waveguide structure consists of a thin layer of graphene at the interface between air and a dielectric layer at a distance d from nonlinear media. The dispersion equation of the waveguide is derived from Maxwell’s equations and numerically solved using Maple 17. The first […]

ملخص الدراسة: Quadrature spatial modulation (QSM) was recently_x000D__x000D_ proposed to increase the spectral efficiency of spatial modulation._x000D__x000D_ In QSM, the real and imaginary parts of a symbol are transmitted_x000D__x000D_ independently from different antennas. A new spatial modulation_x000D__x000D_ technique, termed signed quadrature spatial modulation (SQSM),_x000D__x000D_ is introduced in this paper. Unlike QSM, SQSM creates fourdimensional_x000D__x000D_ spatial […]

ملخص الدراسة: Double spatial modulation (DSM) is a transmission technique which has been recently proposed for multipleinput multiple-output (MIMO) communication systems. DSM has a higher spectral efficiency compared with_x000D__x000D_ classical spatial modulation (SM), as it doubles the number of active transmit antennas. In this paper, transmit_x000D__x000D_ antenna selection (TAS) is applied to DSM in order […]

ملخص الدراسة: The Gaza Strip has been suffering from extreme conditions of political conflicts, underdevelopment, poverty, shortage and salinity of water, etc. Most of these conditions resulted from extreme human behavior creating real disasters. Natural disasters had been known since long time, and recently, human disasters became more understandable after several wars had resulted in […]

ملخص الدراسة: Trellis coded modulation (TCM) is a scheme that enhances the error performance without extra power not bandwidth. This paper presents a modified Super-Orthogonal Trellis-Coded Spatial Modulation (SOTC-SM) based on a cyclic structure of the Space Time Coding. The developed code benefits from expanded codebook of the Space Time Block Coded Spatial Modulation (STBC-SM) […]

ملخص الدراسة: This study presents a spectral approach to estimate the time difference of arrival (TDOA) between a reference unit, composed of a pair of very close antennas (small baseline regarding the operating bandwidth), acting as a known fixed location transmitter, and a mobile unit acting as a single antenna receiver. It uses the channel […]

ملخص الدراسة: Mobile computing is an important field in information technology, because of widely using mobile devises and mobile applications. Clustering is a substantial task gives good results with information retrieval (IR); it aims to put automatically similar applications in one cluster. In this paper, we present an unsupervised machine learning based system for automatic […]

ملخص الدراسة: The purpose of this paper is to develop a model for selecting the best contractor in the Gaza Strip using the Artificial_x000D__x000D_ Neural Network (ANN). The contractor’s selection methods and criteria were identified using a field survey. Fifty four engineers_x000D__x000D_ were asked to fill a questionnaire that covers factors related to the selection […]