This paper addresses the limitations of current satellite payload architectures, which are predominantly hardware-driven and lack the flexibility to adapt to...

High throughput satellites (HTS), with their digital payload technology, are expected to play a key role as enablers of the upcoming 6G networks. HTS are mai...

We investigate the optimal power allocation in an OFDM-SDMA system when some users have minimum requirements for their downlink transmission rate. We first ...

In this paper, we propose a queueing model to analyze the performance of an opportunistic spectrum access (OSA) system with service interruptions operating o...

We provide a comprehensive delay and queueing analysis for two baseline medium access control protocols for multi-user cognitive radio networks with homogene...

Notables features of cognitive radios have made them a technology of choice for wireless communications and motivated the notion of cognitive radio cellular ...

Dynamic spectrum access (DSA) for secondary networks improves the spectrum utilization by finding spectrum opportunities and exploiting them efficiently. A k...

In this paper, we present a new queueing model providing the accurate average system time for packets transmitted over a cognitive radio (CR) link for multip...

Cognitive radio networks (CRNs) benefit from several features, such as decision-making, spectrum-awareness and reconfigurability over heterogeneous channels....

Cognitive radio networks (CRNs) benefit from several features, such as decision-making, spectrum-awareness and reconfigurability, which enable them to perfor...

Regarding the integration of services and applications, a requisite for the widely deployment of cognitive radio networks is the support of service different...

In this paper, we derive PDF and CDF expressions for the end-to-end SNR of an opportunistic relaying amplify-and-forward (AF) cooperative diversity over inde...

In cooperative networks, mobile users do not only have the role of a data source or destination but can also act as relays to help transmissions from others....

We consider multi-antenna base stations using orthogonal frequency-division multiple access and space division multiple access techniques to serve single-a...

In this article, we provide an analytical framework to assess network level QoS measures for differentiated non-saturated traffic in infrastructure mode 802....

This paper analyzes the impact of feedback delay on the performance of multiuser selection diversity systems employing orthogonal space-time block coding (OS...

In this paper, for the purpose of service differentiation in opportunistic spectrum access (OSA) enabled networks, we take different priority queueing discip...

Cognitive radio networks (CRNs) benefit from several features, such as decision-making, spectrum-awareness and reconfigurability, which enable them to perfor...

In this paper we analyze the promising, but yet mostly unexplored, ability of opportunistic spectrum access (OSA) based on cognitive radios (CR) to provide a...

In this paper, we introduce a queueing approach with server interruptions to analyze the performance of a cognitive radio (CR) link subject to recurrent fail...

Cognitive radio-based Long Term Evolution (LTE) networks enjoy the interesting features of cognitive Radios (CR), such as learning and reconfigurability, wh...

Cognitive radios (CR) are an efficient approach to deploy a secondary network in the vacant portions of the spectrum licensed to primary networks. However, w...

Cognitive radios (CR) are an efficient approach to deploy a secondary network in the vacant portions of the spectrum licensed to primary networks. However, w...

To ensure widespread deployment and popularity, next generation wireless services will require a Quality of Service (QoS), and particularly a reliability, th...

Although the main objectives of dynamic spectrum access and cognitive radios are to solve the problem of spectrum scarcity and usage inefficiency, we show in...

In this paper, we present the PolyMAX module which enhances ns-2 (network simulator 2), the most popular network simulator used in academia, to provide one o...

In this paper, we evaluate the impact of the wireless channel and physical layer parameters on the performance of VoIP traffic in IEEE 802.11g networks. The ...

The convergence of different classes of traffic with different priorities over the wire- less network has become a reality. To insure that the users of key ...