Publications Scientifiques
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Item Gain Enhancement of Monopole Antenna using AMC Surface(Advanced Electromagnetics, 2018) Mouhouche, Faiza; Azrar, Arab; Dehmas, Mokrane; Djafer, KahinaA CPW rectangular-ring antenna over an Artificial Magnetic Conductor (AMC) is presented in this work. The AMC is a designed as a dual-band structure having an array of unit cells and operates at 2.45GHz and 5.20 GHz. A CPW antenna uses this dual-band AMC structures as a back-plane. Performance comparison is carried out with and without incorporation of AMC. The simulated and measured results show that the combination of the AMC reflector and the antenna provide directional properties at both frequency bands. It has been found that the antenna gain increases by about 5 dBItem Design and analysis of a microstrip patch antenna for medical applications(IEEE, 2017) Grabssi, Wahiba; Izza, Sarah; Azrar, ArabIn this work, a dual band Microstrip patch implantable antenna for biomedical applications has been presented to operate in both Medical Implant Communications Service (MICS) with a range of 402-405 MHz and 2.4-2.5 GHz band chosen among the Industrial Scientific and Medical (ISM). A rectangular antenna has been first simulated to operate in MICS band with dimensions of 179.7 × 228.3 × 1.63 mm, then, a new meandered serpentine shape, with single feed point, has been used in order to lengthen the current path and covers both MICS and ISM bands with new dimensions of 31 × 25 × 1.63 mm printed on dielectric material of 4.3 constantItem Beamspace Unitary ESPRIT Parameter Channel Estimation for Pilot Contamination Mitigation(Institute of Electrical and Electronics Engineers Inc., 2018) Smaili, N.; Djeddou, Mustapha; Chafaa, Irched; Azrar, ArabThe main aim of this paper is to resolve a pilot contamination (PC) problem in multicell Massive MIMO system, where the PC is considered as a bottleneck in such systems caused by lack of orthogonality. To address this constrained problem, we propose a new approach based on beamspace unitary (BU) estimation of signal parameters via rotational invariance technique (ESPRIT) for parameter channel estimation. Indeed, the PC mitigation is based on two steps, channels parameter estimation and then reconstruction of desired channel by exploiting the path gains magnitude. The simulation results demonstrate the effectiveness of the proposed approach.Item Pilot contamination mitigation based on antenna subset transmission for mmWave massive MIMO(wiley, 2018) Smaili, Nessrine; Djeddou, Mustapha; Azrar, ArabThis paper tackles the problem of pilot contamination (PC) in mmWave Mas- sive MIMO cellular systems. We propose an analog precoder based on antenna subset transmission technique to mitigate the PC. This technique ensures the interfering signal to become noise-like signal thus helping a more efficient estimation of channel coefficients. Also, this strategy is low cost and introduces no complexity load. The result shows the effectiveness of the proposed precoder to mitigate PC issueItem Effect of oblique projection beamforming on the achievable rate in massive MIMO system(Springer, 2018) Smaili, Nessrine; Djeddou, Mustapha; Ghanem, K.; Azrar, ArabItem Spectral-domain integral-equation analysis of microstrip antenna working around 24 GHz(Wiley, 2000) Azrar, Arab; Aksas, Rabia; Vander Vorst, AndréItem Full-wave analysis of the broadband circular polarization microstrip patch antenna(Wiley, 2000) Azrar, Arab; Aksas, Rabia; Vander Vorst, AndreItem Full‐wave analysis of the broadband circular polarization microstrip patch antenna(Wiley, 2000) Azrar, Arab; Aksas, Rabia; Vander Vorst, AndreItem Novel analysis and design approaches of the planar antenna arrays(Springer, 2007) Azrar, Arab; Chemsa, Ali; Aksas, RabiaItem Traveling wave antennas optimization using genetic algorithms(IEEE, 2008) Recioui, Abdelmadjid; Azrar, Arab; Dehmas, Mokrane; Challal, Mouloud; Bentarzi, Hamid