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Non-orthogonal multiple access (NOMA) has received tremendous attention for the development of 5G and beyond wireless networks. Power-domain NOMA works on the concept of assigning varying power levels to users within the same frequency and time block. In this paper we propose a novel power allocation approach that uses the Zipf distribution law that satisfies the basic condition of a NOMA system....
In this paper, we present simulation results of monostatic configuration for microwave imaging system by using confocal algorithm to detect and localize metallic bars inserted in a concrete pillar. An ultra‐wideband antenna has been used. The dielectric property values of the model were chosen near those of the realities. However, we have changed the permittivity of the concrete pillar to study the...
In this paper, we describe the design of an ultra wide band (UWB) system for microwave imaging system, using monopole antenna fed by a 50 Ω microstrip line, operating over 1.416 – 9.367 GHz band. To meet the requirements of the specifications of our application, some bandwidth enlargement techniques have been introduced such as: the insertion slots, and the use of partial ground plans. A simple breast...
This paper presents a MIMO array design with a reduced number of antennas of a 2×5 combination with 2 transmitting antennas and 5 receiving antennas. The system is designed to have a compact size for UWB microwave imaging in medical application. A suitable compact UWB antenna is designed with a fractional bandwidth of more than 128%, which achieves a good UWB performances. The mutual coupling within...
In this paper, we have implemented a numerical tool using finite element method (FEM) for designing an antenna for MRI (Magnetic Resonance Imaging) probe operating at high field. The birdcage antenna type is a transverse electromagnetic (TEM) coupled lines resonator, and the developed model in the absence of a biological load is based on the propagation equations of voltages and currents on the coupled...
Using the finite element method (FEM) and method of moments (MoM) in two dimensions, the electromagnetic (EM) analysis and design of a n-element coupled-microstrip-line quasi-TEM resonator are presented. The analysis allows the determination of the primary inductive and capacitive matrices ([L], [C]) and simulates the frequency response of S11 at the RF port of the designed n-element inhomogeneous...
This study introduces an original theoretical approach for rectangular microstrip antennas analysis and design. The purpose method consists in the coupling between artificial neural networks tool applied to the analysis of rectangular antennas and a tabu search for the optimization. A neural network acting as database will allow to reduce strongly the computation time. This method will be illustrated...
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