Search results for: Mohamed Ibnkahla

Items from 1 to 20 out of 50 results

article

Impact of Opportunistic Spectrum Sharing on the Performance of Amplify-and-Forward Incremental Relaying

Ala Abu Alkheir, Mohamed Ibnkahla

Wireless Personal Communications > 2017 > 96 > 3 > 4145-4166

Multihop communication is widely used in cognitive radio networks to facilitate agile access to opportunistically available spectrum resources while adequately protecting primary users (PUs). However, the performance of this collaborative communication is sensitive to spectrum sensing accuracy and the unpredictable activities of PUs. To quantify the impact of these factors, this article studies the...

chapter

Effect of TWT modeling error on the performance of satellite channels

Jun Yuan, Mohamed Ibnkahla

2002 9th International Symposium on Antenna Technology and Applied Electromagnetics [ANTEM] > 1

2002 9th International Symposium on Antenna Technology and Applied Electromagnetics [ANTEM]

In satellite mobile communications, TWT (Traveling Wave Tube) amplifiers are used to increase power efficiency. Unfortunately, power-efficient amplifiers cause nonlinear distortions to the transmitted signal These distortions make the received symbols no longer on the original regular lattice but on a warped one. Several authors use analytical models (such as Saleh model) to describe both amplitude...

chapter

New adaptive polynomial and neural network predistortion techniques for satellite transmissions

Rober Boutros, Mohamed Ibnkahla

2002 9th International Symposium on Antenna Technology and Applied Electromagnetics [ANTEM] > 1

2002 9th International Symposium on Antenna Technology and Applied Electromagnetics [ANTEM]

In order to allow maximum exploitation of the frequency spectrum, the current trend is to increase the spectrum efficiency by using high modulation techniques e.g. multilevel quadrature amplitude modulation (QAM). The use of High Power Amplifiers (HPA), e.g., TWT, in satellite communications channels causes severe nonlinear distortions to the transmitted signal. The transmitted signal is more sensitive...

chapter

Analysis of 16-star (8,8) QAM modulation over nonlinear channels

Hisham Alasady, Mohamed Ibnkahla

2002 9th International Symposium on Antenna Technology and Applied Electromagnetics [ANTEM] > 1

2002 9th International Symposium on Antenna Technology and Applied Electromagnetics [ANTEM]

This paper proposes a simple method to calculate the probability of error (POE) of 16-star (8,8) QAM constellations over nonlinear channels. The method does not need to find the decision regions for each constellation, which is often difficult to find. It does not need also any numerical calculation to evaluate integrations that appear in general when we need to calculate the exact probability of...

chapter

Nonlinear Channel Identification Using Natural Gradient Descent: Application to Modeling and Tracking

Mohamed Ibnkahla

Studies in Fuzziness and Soft Computing > Soft Computing in Communications > Neural Networks > 55-70

This chapter applies the natural gradient (NG) descent for adaptive identification of nonlinear channels with memory. The nonlinear channel is comprised of a discrete-time linear filter H followed by a zero-memory nonlinearity g(.). The adaptive system is a neural network which is composed of a linear adaptive filter Q followed by a two-layer memoryless nonlinear neural network (NN). It is shown that...

chapter

Integrating energy harvesting and dynamic spectrum allocation in Cognitive Radio Networks

Ayman Sabbah, Mohamed Ibnkahla

2016 IEEE Wireless Communications and Networking Conference > 1 - 6

2016 IEEE Wireless Communications and Networking Conference (WCNC)

Enabling Energy Harvesting (EH) for Cognitive Radio Networks (CRNs) is promising to extend their lifetime. Since Secondary Users (SUs) can either access the spectrum or harvest energy, EH should be integrated within the context of Dynamic Spectrum Access (DSA), in order to increase both the energy efficiency and the spectrum efficiency. This paper proposes a novel algorithm that enables SUs to harvest...

chapter

Optimizing dynamic spectrum allocation for cognitive radio networks using hybrid access scheme

Ayman Sabbah, Mohamed Ibnkahla

2016 IEEE Wireless Communications and Networking Conference > 1 - 6

2016 IEEE Wireless Communications and Networking Conference (WCNC)

Allowing Secondary Users (SUs) to access the licensed spectrum without causing harmful interference to the Primary Users (PUs) is crucial in enabling the Cognitive Radio (CR) technology. In order to increase the utilization of the spectrum bands, we propose a Dynamic Spectrum Allocation (DSA) algorithm that integrates both interweave and underlay spectrum access schemes. The proposed algorithm will...

chapter

Machine-to-Machine Communications in Cognitive Cellular Systems

Waleed Ejaz, Mohamed Ibnkahla

2015 IEEE International Conference on Ubiquitous Wireless Broadband (ICUWB) > 1 - 5

2015 IEEE International Conference on Ubiquitous Wireless Broadband (ICUWB)

Machine-to-machine (M2M) communication systems consist of massive autonomous devices which hold the ability to sense, communicate, and process information ubiquitously. The major challenges posed by M2M devices are spectrum scarcity, spectrum inefficiency, and network overload. Endowing M2M devices with cognitive radio technology can be a promising solution to these challenges. This paper presents...

chapter

Software-defined wireless network architectures for the Internet-of-Things

Amr El-Mougy, Mohamed Ibnkahla, Lobna Hegazy

2015 IEEE 40th Local Computer Networks Conference Workshops (LCN Workshops) > 804 - 811

2015 IEEE 40th Local Computer Networks Conference Workshops (LCN Workshops)

The Internet-of-Things (IoT) envisions a world where billions of everyday objects and mobile devices communicate using a large number of interconnected wired and wireless networks. Maximizing the utilization of this paradigm requires fine-grained QoS support for differentiated application requirements, context-aware semantic information retrieval, and quick and easy deployment of resources, among...

article

Reconfigurable Wireless Networks

Amr El-Mougy, Mohamed Ibnkahla, Ghaith Hattab, Waleed Ejaz

Proceedings of the IEEE > 2015 > 103 > 7 > 1125 - 1158

Driven by the advent of sophisticated and ubiquitous applications, and the ever-growing need for information, wireless networks are without a doubt steadily evolving into profoundly more complex and dynamic systems. The user demands are progressively rampant, while application requirements continue to expand in both range and diversity. Future wireless networks, therefore, must be equipped with the...

chapter

Single-Pixel-Camera Paradigm for Multiband Cooperative Sensing in Cognitive Radio Systems

Mouna Sghaier, Fatma Abdelkefi, Mohamed Siala, Mohamed Ibnkahla

2015 IEEE 81st Vehicular Technology Conference (VTC Spring) > 1 - 5

2015 IEEE 81st Vehicular Technology Conference (VTC Spring)

Cooperative multiband spectrum sensing presents the next generation of cognitive radio networks, where multiple bands are sensed and accessed to improve spectrum maintenance and to enhance the network throughput. In order to concretize this concept, several uniform cooperative spectrum sensing techniques have been proposed in literature which suffers from a high complexity computation over the global...

chapter

A combined LMS-SOM algorithm for time-varying non-linear channel equalization

Steven Bouchired, Mohamed Ibnkahla, Williams Paquier

9th European Signal Processing Conference (EUSIPCO 1998) > 1 - 4

9th European Signal Processing Conference (EUSIPCO 1998)

The paper proposes a self-organizing map (SOM) approach to equalize time-varying non-linear channels. The approach is applied to a satellite mobile communication channel which is composed of time invariant linear filters, a non-linear memoryless amplifier and a time-varying multi-path propagation channel. The SOM is combined to a Transversal Linear Equalizer (TLE) which is trained by the LMS algorithm...

chapter

Optimized node classification and channel pairing scheme for RF energy harvesting based cognitive radio sensor networks

Saleem Aslam, Mohamed Ibnkahla

2015 IEEE 12th International Multi-Conference on Systems, Signals & Devices (SSD15) > 1 - 6

2015 12th International Multi-Conference on Systems, Signals & Devices (SSD)

Spectral-efficiency and energy-efficiency are the key concerns for next-generation wireless networks. RF energy-harvesting is emerged as a prominent technology which self-empowers wireless nodes to achieve energy-efficiency. For spectral-efficiency, the opportunistic spectrum-access technology (by employing cognitive radios) is an optimal solution. Therefore, in this paper, we merge both technologies...

article

A context and application-aware framework for resource management in dynamic collaborative wireless M2M networks

Amr El Mougy, Aymen Kamoun, Mohamed Ibnkahla, Saïd Tazi, more

Journal of Network and Computer Applications > 2014 > 44 > Complete > 30-45

Achieving end-to-end goals of Wireless Machine to Machine Networks (M2M) is a highly challenging task. These goals include guaranteeing connectivity and maximizing throughput while satisfying application layer Quality of Service (QoS) requirements. Moreover, the problem becomes more complicated in the context of emerging dynamic allocation of application layer software components. This paper presents...

article

A MAC protocol with mobility support in cognitive radio ad hoc networks: Protocol design and analysis

Peng Hu, Mohamed Ibnkahla

Ad Hoc Networks > 2014 > 17 > Complete > 114-128

Cognitive radio ad hoc networks (CRAHNs) have recently been proposed as a way to bring cognitive radio (CR) technology to traditional ad hoc networks. An important problem is to design a medium access control (MAC) protocol that addresses the decentralized control and local observation for spectrum management. In this paper, we propose a cognitive MAC protocol with mobility support (CM-MAC) based...

article

A cognitive framework for WSN based on weighted cognitive maps and Q-learning

Amr El-Mougy, Mohamed Ibnkahla

Ad Hoc Networks > 2014 > 16 > Complete > 46-69

Due to the rising popularity of Wireless Sensor Networks (WSN), there has been an increasing demand for more challenging applications. Generally speaking, such applications demand the support of Quality of Service (QoS) constraints and often multiple conflicting objectives. To address these requirements, network management becomes a critical task. However, single layer and cross-layer techniques will...

chapter

Efficient spectrum allocation algorithm for Cognitive Radio Networks in a shadow fading environment

Ayman Sabbah, Mohamed Ibnkahla

2014 IEEE Wireless Communications and Networking Conference Workshops (WCNCW) > 288 - 293

2014 IEEE Wireless Communications and Networking Conference Workshops (WCNCW)

The efficiency of Cognitive Radio Networks (CRNs) depends on the used spectrum allocation algorithms. In this paper, we propose a new Dynamic Spectrum Allocation (DSA) algorithm that jointly considers the geographical locations of the nodes along with fading, quality of the communication links, interference between the primary and the secondary networks, the activity of the users, and the fairness...

article

A Survey of Networking Challenges and Routing Protocols in Smart Grids

Ayman I. Sabbah, Amr El-Mougy, Mohamed Ibnkahla

IEEE Transactions on Industrial Informatics > 2014 > 10 > 1 > 210 - 221

Smart grids (SG) represent the next step in modernizing the current electric grid. In this structure, a communications network is combined with the power grid in order to gather information that can be used to increase the efficiency of the grid, reduce power consumption, and improve the reliability of services, among other numerous advantages. SG communication networks are unique in their large scale...

article

Corrections to “Multiband Spectrum Access: Great Promises for Future Cognitive Radio Networks”

Ghaith Hattab, Mohamed Ibnkahla

Proceedings of the IEEE > 2014 > 102 > 7 > 1106

article

Tag Modulation Silencing: Design and Application in RFID Anti-Collision Protocols

Abdallah Alma'aitah, Hossam S. Hassanein, Mohamed Ibnkahla

IEEE Transactions on Communications > 2014 > 62 > 11 > 4068 - 4079

Reliable and energy-efficient reading of Radio Frequency IDentification (RFID) tags is of utmost importance, especially in mobile and dense tag settings. We identify tag collisions as a main source of inefficiency in terms of wasting both medium access control (MAC) frame slots and reader's energy. We propose modulation silencing (MS), a reader-tag interaction framework to limit the effect of tag...

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COGNITIVE RADIO (13)
SENSORS (9)
PROTOCOLS (7)
WIRELESS SENSOR NETWORKS (6)
INTERFERENCE (5)
NEURAL NETWORKS (5)
OPTIMIZATION (5)
RESOURCE MANAGEMENT (5)
SIGNAL TO NOISE RATIO (5)
COGNITION (4)
COMPUTER ARCHITECTURE (4)
NONLINEAR DISTORTION (4)
QUALITY OF SERVICE (4)
THROUGHPUT (4)
DYNAMIC SPECTRUM ALLOCATION (3)
FADING (3)
MODULATION (3)
WEIGHTED COGNITIVE MAP (3)
AMBIENT INTELLIGENCE (2)
ARTIFICIAL NEURAL NETWORKS (2)
BACKSCATTER (2)
COGNITIVE (2)
DECISION MAKING (2)
ENERGY HARVESTING (2)
ENVIRONMENTAL APPLICATIONS (2)
ERROR PROBABILITY (2)
HEURISTIC ALGORITHMS (2)
INCREMENTAL RELAYING (2)
MOBILE COMMUNICATION (2)
PROBABILITY (2)
QUADRATURE AMPLITUDE MODULATION (2)
RECEIVERS (2)
RELAYS (2)
ROUTING (2)
SATELLITE COMMUNICATIONS (2)
SENSOR (2)
SPECTRUM SENSING (2)
SPECTRUM SHARING (2)
STATISTICAL ANALYSIS (2)
WIRELESS NETWORKS (2)
WIRELESS SENSOR NETWORK (2)
ACCESS PROTOCOLS (1)
ADAPTATION MODEL (1)
ADAPTIVE SIGNAL PROCESSING (1)
AGGREGATES (1)
ANALYTICAL MODELS (1)
ANTENNAS (1)
APPLICATION-SPECIFIC SENSOR NETWORKS (1)
ARGON (1)
ARTIFICIAL INTELLIGENCE (1)
BACKPROPAGATION ALGORITHM (1)
BATTERIES (1)
BIOLOGICAL SYSTEM MODELING (1)
CALL ADMISSION PROTOCOL (1)
CAPACITORS (1)
CASCADING STYLE SHEETS (1)
CHANNEL IDENTIFICATION (1)
CHANNEL STATISTICAL PARAMETER (1)
CLOSED-FORM SOLUTIONS (1)
CLOUD COMPUTING (1)
CO-CHANNEL INTERFERENCE (1)
COGNITIVE AGENTS (1)
COGNITIVE NETWORKS (1)
COGNITIVE NODE (1)
COGNITIVE NODES (1)
COGNITIVE RADIO AD HOC NETWORKS (1)
COGNITIVE RADIO NETWORKS (1)
COGNITIVE RADIO SENSOR NETWORKS (1)
COGNITIVE WIRELESS SENSOR NETWORK (1)
COMMUNICATION STANDARDS (1)
COMPREHENSIVE PROPAGATION MODEL (1)
COMPRESSED SENSING (1)
COMPUTATIONAL MODELING (1)
COMPUTER NETWORK RELIABILITY (1)
CONNECTIVITY (1)
CONSTELLATION DIAGRAM (1)
CONTEXT AWARENESS (1)
CONTEXT-AWARE SERVICES (1)
CONTROL SYSTEMS (1)
CONVERGENCE (1)
COOPERATIVE COMMUNICATIONS (1)
CORRELATED SHADOW FADING MAP (1)
CORRELATED SHADOWING ENVIRONMENT (1)
CORRELATION (1)
CORRELATION METHODS (1)
CROSS LAYER DESIGN (1)
CROSS-LAYER DESIGN (1)
CROSS-LAYER RECONFIGURATION (1)
DECODING (1)
DESIGN TRADEOFFS (1)
DYNAMIC ALLOCATION OF SOFTWARE COMPONENTS (1)
DYNAMIC SCHEDULING (1)
ENCODING (1)
ENGINES (1)
EXPONENTIAL INTEGRAL FUNCTION (1)
FADING CHANNELS (1)
FAULT-TOLERANCE (1)
FCC (1)
GAMES (1)
GRADIENT DESCENT (1)
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INFONA - science communication portal

Search results for: Mohamed Ibnkahla

Impact of Opportunistic Spectrum Sharing on the Performance of Amplify-and-Forward Incremental Relaying

Effect of TWT modeling error on the performance of satellite channels

New adaptive polynomial and neural network predistortion techniques for satellite transmissions

Analysis of 16-star (8,8) QAM modulation over nonlinear channels

Nonlinear Channel Identification Using Natural Gradient Descent: Application to Modeling and Tracking

Integrating energy harvesting and dynamic spectrum allocation in Cognitive Radio Networks

Optimizing dynamic spectrum allocation for cognitive radio networks using hybrid access scheme

Machine-to-Machine Communications in Cognitive Cellular Systems

Software-defined wireless network architectures for the Internet-of-Things

Reconfigurable Wireless Networks

Single-Pixel-Camera Paradigm for Multiband Cooperative Sensing in Cognitive Radio Systems

A combined LMS-SOM algorithm for time-varying non-linear channel equalization

Optimized node classification and channel pairing scheme for RF energy harvesting based cognitive radio sensor networks

A context and application-aware framework for resource management in dynamic collaborative wireless M2M networks

A MAC protocol with mobility support in cognitive radio ad hoc networks: Protocol design and analysis

A cognitive framework for WSN based on weighted cognitive maps and Q-learning

Efficient spectrum allocation algorithm for Cognitive Radio Networks in a shadow fading environment

A Survey of Networking Challenges and Routing Protocols in Smart Grids

Corrections to “Multiband Spectrum Access: Great Promises for Future Cognitive Radio Networks”

Tag Modulation Silencing: Design and Application in RFID Anti-Collision Protocols

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