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Sidi Mohamed Farssi

Bio: Sidi Mohamed Farssi is an academic researcher from Cheikh Anta Diop University. The author has contributed to research in topics: Steganography & MIMO. The author has an hindex of 6, co-authored 39 publications receiving 167 citations.

Papers
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Journal ArticleDOI
TL;DR: A novel compact dual-band antenna-system for LTE multi-input and multi-output (MIMO) mobile handsets using 3D Inverted-F- Antennas folded on the non-metalized part of the Printed Circuit Board (PCB).
Abstract: In this communication, we present a novel compact dual-band antenna-system for LTE multi-input and multi-output (MIMO) mobile handsets. The radiators consist of 3D Inverted-F- Antennas (IFAs) folded on the non-metalized part of the Printed Circuit Board (PCB) and operating in the LTE 700 MHz band. A parasitic radiating element is also attached to the IFAs to operate in the LTE 2.5-2.7 GHz band. Two antennas are placed on a realistic PCB (100 × 40 mm2) for MIMO operation. Various antenna configurations are tested when moving their position on the PCB. Based on the highest port-to-port isolation criterion, two configurations are adopted and their performances are compared. Both simulated and measured results are shown to illustrate the MIMO capabilities of the proposed structures.

71 citations

Journal ArticleDOI
TL;DR: A combination of this parameter based on Box Counting with GLCM Features has the potential to improve clinical diagnostics tests for osteoporosis pathologies.
Abstract: Fractal analysis has been shown to be useful in image processing for characterizing shape and gray-scale complexity. The fractal feature is a compact descriptor used to give a numerical measure of the degree of irregularity of the medical images. This descriptor property does not give ownership of the local image structure. In this paper, we present a combination of this parameter based on Box Counting with GLCM Features. This powerful combination has proved good results especially in classification of medical texture from MRI and CT Scan images of trabecular bone. This method has the potential to improve clinical diagnostics tests for osteoporosis pathologies.

24 citations

Journal ArticleDOI
TL;DR: Fractal analysis has been shown to be useful in image processing for characterizing shape and gray-scale complexity as discussed by the authors, and a combination of this parameter based on Box Counting with GLCM Features has proved good results especially in classification of medical texture from MRI and CT Scan images of trabecular bone.
Abstract: Fractal analysis has been shown to be useful in image processing for characterizing shape and gray-scale complexity. The fractal feature is a compact descriptor used to give a numerical measure of the degree of irregularity of the medical images. This descriptor property does not give ownership of the local image structure. In this paper, we present a combination of this parameter based on Box Counting with GLCM Features. This powerful combination has proved good results especially in classification of medical texture from MRI and CT Scan images of trabecular bone. This method has the potential to improve clinical diagnostics tests for osteoporosis pathologies.

18 citations

Journal ArticleDOI
TL;DR: This paper presents an implementation of the technique Matrix Embedding using the Reed-Solomon codes, which allow easy way to solve the problem of bounded syndrome decoding, a problem which is the basis for the technique of embedding matrix.
Abstract: Modern steganography [1] is a new science that makes a secret communication. Using the technique of Matrix Embedding in steganography schemes tends to reduce distortion during insertion. Recently, Fontaine and Galand [2] showed that the Reed-Solomon codes can be good tools for the design of a Steganographic scheme. In this paper, we present an implementation of the technique Matrix Embedding using the Reed-Solomon codes. The advantage of these codes is that they allow easy way to solve the problem of bounded syndrome decoding, a problem which is the basis of the technique of embedding matrix .

13 citations

Proceedings ArticleDOI
14 Apr 2014
TL;DR: The scheme proposed in this paper allows minimizing the embedding impact and gives similar results as those of PCS scheme with a reduced time complexity.
Abstract: This paper proposes two approaches that reduce the complexity of the Polar Coding Steganography (PCS). The first is based on lookup tables and the second exploits the form of the syndrome, calculated from cover vector and secret message, to evaluate la position of the cover vector changes. The scheme proposed in this paper allows minimizing the embedding impact and gives similar results as those of PCS scheme with a reduced time complexity.

8 citations


Cited by
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Journal ArticleDOI
Guowen Ding1, Ke Chen1, Xin-Yao Luo1, Junming Zhao1, Tian Jiang1, Yijun Feng1 
TL;DR: In this article, a reflective, dual-helicity decoupled coding metasurface is used to realize completely independent control of OAM vortices for two orthogonal helicities, achieving a free combination of distinctive OAM topological charges.
Abstract: Controlling the conversion of light's spin angular momentum to orbital angular momentum (OAM) is crucial for applications, including optical systems and wireless communication. In this regard, metasurfaces are often limited by the difficulty of producing independent spin-to-OAM conversions. This study uses a reflective, dual-helicity decoupled coding metasurface to realize completely independent control of OAM vortices for two orthogonal helicities, achieving a free combination of distinctive OAM topological charges, arbitrary helicity, anomalous scattering, and complex spatial beam editing. These results could help to integrate versatile functionalities for advanced compact systems.

128 citations

Journal ArticleDOI
TL;DR: In this paper, a planar multiband multiple-input-multiple-output (MIMO) antenna is presented, which consists of two symmetrical radiating elements connected by neutralizing line to cancel the reactive coupling.
Abstract: A novel and compact planar multiband multiple-input-multiple-output (MIMO) antenna is presented. The proposed antenna is composed of two symmetrical radiating elements connected by neutralizing line to cancel the reactive coupling. The radiating element is designed for different frequencies operating in GSM 900 MHz, DCS 1800 MHz, LTE-E 2300 MHz, and LTE-D 2600 MHz, which consists of a folded monopole and a beveled rectangular metal patch. The presented antenna is fed by using 50-Ω coplanar waveguide (CPW) transmission lines. Four slits are etched into the ground plane for reducing the mutual coupling. The measured results show that the proposed antenna has good impedance matching, isolation, peak gain, and radiation patterns. The radiation efficiency and diversity gain (DG) in the servicing frequencies are pretty well. In the Ericsson indoor experiment, three kinds of antenna feed systems are discussed. The proposed antenna shows good performance in Long Term Evolution (LTE) reference signal receiving power (RSRP), download speed, and upload speed.

89 citations

Journal ArticleDOI
TL;DR: A transmission-line-based decoupling technique for dual-polarized multiple-input and multiple-output (MIMO) antenna arrays is presented and analyzed, which enables well-canceled coupling for the adjacent elements under co- polarization, without degrading the isolation of the cross-polarsized ports.
Abstract: A transmission-line-based decoupling technique for dual-polarized multiple-input and multiple-output (MIMO) antenna arrays is presented and analyzed. The proposed scheme enables well-canceled coupling for the adjacent elements under co-polarization, without degrading the isolation of the cross-polarized ports. First, a decoupling network based on the presented method for a $2 \times 2$ MIMO array is provided, along with a comprehensive design procedure. Calculations and simulations are operated to verify decoupling performance. For further verification, a $2 \times 2$ dual-polarized patch array with the proposed decoupling method is developed. The decoupling network characterizes low profile, compact size, and low insertion loss, which is realized in a single layer. Measurements denote that the isolations between the co-polarized elements are improved from 16 to 20 dB to over 30 dB after decoupling at the center frequency of 2.45 GHz. Subsequently, based on the proposed $2 \times 2$ decoupling method, a decoupling network for large-scale dual-polarized MIMO arrays is presented. A design example of a $4 \times 4$ dual-polarized patch antenna array is established. Full-wave simulations indicate that the isolations are enhanced to better than 30 dB with a small insertion loss of less than 0.45 dB and can widely be used for phased array and massive MIMO array systems.

81 citations

Journal ArticleDOI
TL;DR: A novel compact dual-band antenna-system for LTE multi-input and multi-output (MIMO) mobile handsets using 3D Inverted-F- Antennas folded on the non-metalized part of the Printed Circuit Board (PCB).
Abstract: In this communication, we present a novel compact dual-band antenna-system for LTE multi-input and multi-output (MIMO) mobile handsets. The radiators consist of 3D Inverted-F- Antennas (IFAs) folded on the non-metalized part of the Printed Circuit Board (PCB) and operating in the LTE 700 MHz band. A parasitic radiating element is also attached to the IFAs to operate in the LTE 2.5-2.7 GHz band. Two antennas are placed on a realistic PCB (100 × 40 mm2) for MIMO operation. Various antenna configurations are tested when moving their position on the PCB. Based on the highest port-to-port isolation criterion, two configurations are adopted and their performances are compared. Both simulated and measured results are shown to illustrate the MIMO capabilities of the proposed structures.

71 citations

Book ChapterDOI
01 Jan 2017
TL;DR: This chapter shall examine the challenges in designing algorithms and systems for healthcare analytics and applications, followed by a survey on various relevant solutions.
Abstract: Increasing demand and costs for healthcare, exacerbated by ageing populations and a great shortage of doctors, are serious concerns worldwide. Consequently, this has generated a great amount of motivation in providing better healthcare through smarter healthcare systems. Management and processing of healthcare data are challenging due to various factors that are inherent in the data itself such as high-dimensionality, irregularity and sparsity. A long stream of research has been proposed to address these problems and provide more efficient and scalable healthcare systems and solutions. In this chapter, we shall examine the challenges in designing algorithms and systems for healthcare analytics and applications, followed by a survey on various relevant solutions. We shall also discuss next-generation healthcare applications, services and systems, that are related to big healthcare data analytics.

70 citations