Papers by HUSSAIN BEN-AZZA
International Journal of Advanced Computer Science and Applications, 2021
Because of their algebraic structure and simple hardware implementation, linear codes as class of... more Because of their algebraic structure and simple hardware implementation, linear codes as class of errorcorrecting codes, are used in a multitude of situations such as Compact disk, backland bar code, satellite and wireless communication, storage systems, ISBN numbers and so more. Nevertheless, the design of linear codes with high minimum Hamming distance to a given dimension and length of the code, remains an open challenge in coding theory. In this work, we propose a code construction method for constructing good binary linear codes from popular ones, while using the Hadamard matrix. The proposed method takes advantage of the MacWilliams identity for computing the weight distribution, to overcome the problem of computing the minimum Hamming distance for larger dimensions. Keywords—Binary linear codes; code construction; minimum hamming distance; error-correcting codes; weight distribution; coding theory; hadamard matrix
In this paper we present two methods for algebraic decoding of alternant codes. The paper recalls... more In this paper we present two methods for algebraic decoding of alternant codes. The paper recalls fundamental facts of these codes and the concept of key equation introduced by Berlekamp on which decoding is based. The first method is based on Padé approximants. The second method consist of translating the key equation into a lattice over the ring of polynomials, called key lattice which depends on the syndrome, and then seek a shortest vector in this key lattice, with degrees constraints. The key lattice approach, following the fruitfull formulation of H. W. Lenstra, is based on a result of Grigor'ev showing that computing a minimal vector in the mentioned lattice is polynomial. The computational complexity of the proposed methods are given in terms of the error-correction capability of the codes and results in tractable polynomial time algorithms. A fast parallel version of the key lattice method is deduced.
New Accurate Approximation for the Sum of Generalized Gamma Distributions and its Applications
Applied Mathematics & Information Sciences
By considering the probability density function (PDF) of a generalized Gamma (GG) random variable... more By considering the probability density function (PDF) of a generalized Gamma (GG) random variable (RV) evaluated in terms of a proper subset $H_{1,1}^{1,0}$ class of Fox’s H-function (FHF) and the moment-based approximation to estimate the H-function parameters, a closed-form tight approximate expression for the distribution of the sum of independent and not necessarily identical GG distributed RVs is presented as well as a sufficient condition for the convergence is verified. Such proposed approximate PDF is a useful analytical tool for analyzing the performance of L-branch maximal-ratio combining receivers subject to such a fading model. This result can be also of paramount importance when dealing with an intelligent reflecting surface subject to GG fading channels. Furthermore, various closed-form approximate expressions, such as the cumulative distribution function (CDF), moment-generating function, outage probability (OP), average channel capacity, nth moment of the signal-to-noise ratio (SNR), amount of fading, and average symbol error probability (ASEP) for numerous coherent digital modulation schemes, are derived and examined in terms of FHF. To gain further insight into the system performance, asymptotic closed-form expressions for the ASEP and OP are derived and interesting observations are made. Particularly, our asymptotic analysis reveals that the achievable diversity order for high SNR values depends essentially on the branches’ number. The proposed mathematical analysis is assessed and corroborated by Monte-Carlo simulations using computer algebra systems, while the PDF and CDF are validated further with the aid of the Kullback-Leibler divergence criterion and Kolmogorov-Smirnov test, respectively.
Information
Orthogonal frequency division multiplexing (OFDM) is the key technology used in high-speed commun... more Orthogonal frequency division multiplexing (OFDM) is the key technology used in high-speed communication systems. One of the major drawbacks of OFDM systems is the high peak-to-average power ratio (PAPR) of the transmitted signal. The transmitted signal with a high PAPR requires a very large linear range of the Power Amplifier (PA) on the transmitter side. In this paper, we propose and study a new clipping method named Palm Clipping (Palm date leaf) based on hyperbolic cosine. To evaluate and analyze its performance in terms of the PAPR and Bit Error Rate (BER), we performed some computer simulations by varying the Clipping Ratio (CR) and modulation schemes. The obtained results show that it is possible to achieve a gain of between 7 and 9 dB in terms of PAPR reduction depending on the type of modulation. In addition, comparison with several techniques in terms of PAPR and BER shows that our method is a strong alternative that can be adopted as a PAPR reduction technique for OFDM-ba...
IEEE Access
Physical layer security is an important and timely topic in the research of future wireless syste... more Physical layer security is an important and timely topic in the research of future wireless systems and it constitutes a part of the Internet of Things (IoT) notion. IoT oriented systems are largely characterized by a stringent quality of service and enhanced security requirements, which comes at a cost of increased computational complexity that needs to be maintained within sustainable levels. In the present contribution, we investigate the physical-layer security of a dual-hop energy RF-Powered cognitive radio network over realistic multipath fading conditions. Assuming a spectrum sharing scenario, our analysis assumes that a source S communicates with a destination D with the aid of a multi-antenna relay R and in the presence of an eavesdropper E who is attempting to overhear the communication of both S-R and R-D links. The involved relay is powered by the renewable energy harvested from the signal sent by the source based on the power-splitting energy harvesting strategy. Furthermore, the relay uses a maximum ratio combining technique to process effectively the received signals. In addition, owing to the underlying strategy, both S and R adjust their respective transmit powers in order to avoid causing interference to the primary network. By considering both the independent identically distributed and the independent but not necessarily identically distributed flat Rayleigh fading channels, closed-form expressions for the secrecy outage probability are derived, based on which an asymptotic analysis is carried out. Our results quantify the impact of the main key system parameters and point out the optimal values ensuring a high-security performance of such a communication system. The validity of the derived results is verified extensively through comparisons with respective Monte Carlo simulation results and useful theoretical and technical insights are developed which are expected to be useful in the design of future cooperative CRNs. INDEX TERMS Cognitive radio network, energy harvesting, maximum ratio combining, physical layer security, power splitting, interference, secrecy outage probability.
Improving integrated product design using SWRL rules expression and ontology-based reasoning
Procedia Computer Science
Asymptotic capacity analysis under different adaptive transmission for TAS/MRC MIMO scheme subject to Weibull fading channels
Physical Communication
This paper investigates a unified average channel capacity (ACC) analysis under different adaptiv... more This paper investigates a unified average channel capacity (ACC) analysis under different adaptive transmission of multiple-input multiple-output (MIMO) system, combining single transmit antenna selection (TAS) and maximal-ratio combining (MRC) receiver operating under independent flat Weibull multipath fading channels (WFCs). Based on a tight approximate probability density function expression of the signal-to-noise ratio (SNR) at the considered receiver output, we derive new accurate closed-form expressions of ACC for TAS/MRC system employing several rate adaptation techniques, namely optimal rate adaptation, optimal simultaneous power and rate adaptation, channel inversion with fixed rate (CIFR), truncated CIFR (TCIFR), and continuous power TCIFR (CTCIFR). Further, asymptotic expressions, in both high and low-SNR regimes, are investigated. The results show high accuracy for significant values of L t × L r TAS/MRC system. Indeed, the smaller L t × L r, the better the PDF's accuracy, therefore, the better are the capacities. Numerical outcomes have been assessed by utilizing Mathematica and Matlab Software and corroborated via Monte-Carlo simulations.
Achieving consensus in interval valued intuitionistic fuzzy environment
Procedia Computer Science
Network layer attacks and countermeasures in cognitive radio networks: A survey
Journal of Information Security and Applications
A secure cooperative transmission model in VANET using attribute based encryption
2016 International Conference on Advanced Communication Systems and Information Security (ACOSIS), 2016
Performance analysis of TAS/MRC based MIMO systems over Weibull fading channels
2016 International Conference on Advanced Communication Systems and Information Security (ACOSIS), 2016
In this paper, we investigate combining single transmit antenna selection (TAS) and receiver maxi... more In this paper, we investigate combining single transmit antenna selection (TAS) and receiver maximal ratio combining (MRC) based Multiple-Input-Multiple-Output (MIMO) systems over independent flat Weibull fading channels. In this system, a single transmit antenna, which maximizes the total received signal power at the receiver, is selected for uncoded transmission and is applied to reduce the system complexity without any loss in diversity. Since much research has been conducted on system performance under Rayleigh and Nakagami-m fading channels, this study will focus on new simple approximate closedform of the post-processing signal to noise ratio (SNR) probability density function (PDF) over Weibull multipath fading channels. Based on this expression, approximate analytical expressions such outage probability (OP), the average channel capacity (CC), and the average symbol error rate (ASER) for several Mary modulation techniques are derived as infinite series, which converge by using a particular hypergeometric function, known as Meijer G-function. Theoritical analysis is verified by computed simulations using Mathematica software.
An ontology-based framework for virtual enterprise integration and interoperability
2016 International Conference on Electrical and Information Technologies (ICEIT), 2016
A secure multi-hops routing for VANETs
2015 International Conference on Wireless Networks and Mobile Communications (WINCOM), 2015
Vehicular ad-hoc networks (VANETs) are a promising communication technology. they offers many app... more Vehicular ad-hoc networks (VANETs) are a promising communication technology. they offers many applications, which will improve traffic management and safety. Nevertheless, those applications have stringent security requirements, as they affect road traffic safety. Security requirement like authentication, privacy and Integrity are crucial to VANETs, as they avoid attacks against vehicle-to-vehicle and vehicle-to-roadside communication. In this paper, we investigate the authentication and privacy issues in VANETs. We explore the Attribute Based Signature (ABS) primitive and its variants. We then select among existing ABS literature, an efficient scheme (the best known) that achieve both traceability and user-privacy (anonymity). Finally, we propose a protocol for VANETs that uses traceable ABS in general context of multi-hop routing.
Efficient Performance Evaluation for EGC, MRC and SC Receivers over Weibull Multipath Fading Channel
Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering, 2015
ABSTRACT The probability density function (PDF) of the output SNR (Signal to Noise Ratio) at a re... more ABSTRACT The probability density function (PDF) of the output SNR (Signal to Noise Ratio) at a receiver operating under Weibull fading multipath channel is unknown in closed form and exists only as a complicated multiple integrals or approximated by a series of functions, or recently, by a single function whose evaluation time is not negligible. Our main result is a new simple approximate closed-form of the SNR PDF at the output of three types of receivers over Weibull multipath fading channels. The advantage of this new expression is that its evaluation time is less compared to all previous results. Based on this expression, approximate analytical expressions of the outage probability (OP), the average bit error rate (BER) for several M-ary modulation techniques, and the average channel capacity (CC) are derived in terms of only one particular hypergeometric function, known as Fox-H function. Numerical results have been validated by simulation and compared with recent results.
Ordonnancement et Programmation Semidéfinie
Unified analysis of EGC diversity over Weibull fading channels
International Journal of Communication Systems, 2015
ABSTRACT In this paper, the performance analysis based on PDF approach of an L-branch equal gain ... more ABSTRACT In this paper, the performance analysis based on PDF approach of an L-branch equal gain combiner (EGC) over independent and not necessarily identical Weibull fading channels is presented. Several closed-form approximate expressions are derived in terms of only one Fox H-function as PDF, cumulative distribution function, and moments of the EGC output Signal-to-noise ratio (SNR), outage probability, amount of fading, channel capacity, and the average symbol error rate for various digital modulation schemes. All results are illustrated and verified by simulations using computer algebra systems.
International Journal of Advanced Computer Science and Applications, 2013
The business need to be structured as an integrated supply chain pushes companies to make use of ... more The business need to be structured as an integrated supply chain pushes companies to make use of a greater level of cooperation and coordination. As a means of coordination, negotiation has been chosen in this work. The object of this paper is to present formalism for negotiation in dynamic planning of a supply chain with the objective of maximizing the overall profit of each partner. To model the SC, we use the multi agent approach. Each enterprise is represented by its negotiator agent. The negotiations are formalized using UML language. The proposed negotiation process allows agents to develop a feasible production schedule.
Novel results for the spectral efficiency and symbol error rate of GSC receiver over identical and uncorrelated weibull fading channels
2014 World Congress on Computer Applications and Information Systems (WCCAIS), 2014
New iterative decoding algorithms of 2D product block codes
2014 World Congress on Computer Applications and Information Systems (WCCAIS), 2014
Engineering, 2014
In this paper, we tried to formulate the interdependences of the systematic maintenance policies ... more In this paper, we tried to formulate the interdependences of the systematic maintenance policies and the choice of a production master plan. We started from the intuitive relation between the time of production and the degradation state of the equipment to mathematically formulate the problematic and thus to build the objective space function and feasible solution set of this multiobjective problematic. The solutions set could after be presented to the decision maker to choose one, or more of these solutions, in order to manage and control the maintenance and production policies at the same time.
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Papers by HUSSAIN BEN-AZZA