Communication

On the capacity of state-dependent Gaussian cognitive interference channel
A Gaussian cognitive interference channel with state (G-CICS) is studied. In this paper, we focus on the two-sender, two-receiver case and consider the communication situation in which two senders transmit a common message to two receivers. Transmitter 1 knows only message $W_{1}$, and transmitter 2, referred to as the cognitive user, knows both messages $W_{1}$ and $W_{2}$ and also the channel...


Admission control and resource allocation strategies for IEEE 802.15.5
In this paper, a novel two-tier mechanism for the access control and resource allocation of a two-hop high data rate IEEE 802.15.5 network is proposed. One of the main contributions in this proposal is the use of a dynamic superframe size in the IEEE 802.15.5. Additionally, the ideas of using a superframe utilization threshold and a channel time allocation period (CTAP) utilization threshold ar...
Elasticity in cloud computing: a survey
Cloud computing is now a well-consolidated paradigm for on-demand services provisioning on a pay-as-you-go model. Elasticity, one of the major benefits required for this computing model, is the ability to add and remove resources “on the fly” to handle the load variation. Although many works in literature have surveyed cloud computing and its features, there is a lack of a detailed analysis...


Enhanced spread spectrum aloha demodulator implementation, laboratory tests and satellite validation
This paper describes the implementation of the first enhanced spread spectrum aloha demodulator, based on an innovative architecture which combines software-defined radio with processing via commercial graphics processing units. The validation tests performed both in laboratory conditions and directly on the satellite EUTELSAT 10A are presented. The performance assessment results obtained via s...
Adaptive limited feedback links for cooperative multi-antenna multicell networks
The overall performance of cooperative networks is quite sensitive to channel state information (CSI) of serving and interfering base stations (BSs) and affected strongly by quality of limited feedback links. In this paper, we propose two adaptive limited feedback strategies for intercell interference cancelation in multi-antenna multicell networks. The first proposed strategy is developed to i...


Low-complexity quantize-and-forward cooperative communication using two-way relaying
Cooperative communication is used as an effective measure against fading in wireless communication systems. In a classical one-way cooperative system, the relay needs as many orthogonal channels as the number of terminal it assists, yielding a poor spectral efficiency. Efficiency is improved in two-way relaying systems, where a relay simultaneously assists two terminals using only one timeslot....
Variable step-size-based sparse adaptive filtering algorithm for channel estimation in broadband wireless communication systems
Sparse channels exist in many broadband wireless communication systems. To exploit the channel sparsity, invariable step-size zero-attracting normalized least mean square (ISS-ZA-NLMS) algorithm was applied in adaptive sparse channel estimation (ASCE). However, ISS-ZA-NLMS cannot achieve a good trade-off between the convergence rate, the computational cost, and the performance. In this paper, w...

Cryptanalysis and improvement of an efficient authenticated key exchange protocol with tight security reduction
The SMEN protocol, proposed by Wu and Ustaoglu in 2009, has been considered to be secure as the authors claimed, and numerous theories are proposed based on this protocol. This paper analyzes the SMEN protocol and finds that this protocol is not resistant to the session corruption attack and the key compromise impersonation attack. Then, we propose an improved protocol with tight security reduc...
Study on cognitive DF relaying cooperation with the mutual interference between primary and secondary users over Nakagami-m fading channels
In this paper, the cognitive relay cooperation (CRC) wireless communication systems are investigated over Nakagami-m fading channels. The decode-and-forward (DF) relay is employed to assist the communications between cognitive source and destination. Especially, to achieve full diversity order, we consider the case in which there is a direct path between cognitive source and destination. Beside...

A comprehensive DCF performance analysis in noisy industrial wireless networks
The use of wireless technology in industrial networks is becoming more popular because of its flexibility, reduction of cable cost, and deployment time. Providing an accurate model to study the most important parameters of these networks, the timeliness and reliability, is essential in assessing the network metrics and choosing proper protocol settings. The Institute of Electrical and Electroni...
Cross-layer design in wireless multi-hop networks: a bargaining game theoretic analysis
This paper studies two key challenges in wireless multi-hop network: resource utility and network throughput. Our solution is a multi-constrained optimization scheme based on cross-layer design and its cooperative mechanism. The proposed scheme incorporates the energy threshold in physical layer and the channel capacity in link layer, and integrates the advantages of tight coupling and loose co...

Adaptive content caching simulation with visualization capabilities
Current Internet architecture is being challenged by the overwhelming multiplication of available content and the increasing requirements of the content delivery applications. Content Delivery Networks have been playing a catalytic role in content delivery solutions, replicating (caching) content at the edges of the network. In this paper, we have investigated the potential benefits offered by ...
Construction of new ISI-free pulses using a linear combination of two polynomial pulses
This paper deals with the design of inter-smybol interference free pulses having reduced sensitivity to time synchronization errors. A new improved Nyquist filter is proposed and investigated. Its impulse response is obtained from a linear combination of new Nyquist pulses with different asymptotical decay rates. Error probability results show that the proposed filter outperforms other existing...
Improving transmission reliability in wireless sensor networks using network coding
Wireless sensor networks employed in industrial and other special applications have strict requirements concerning the transmission reliability, delays and energy efficiency. This paper proposes a scalable approach for increasing transmission reliability in wireless sensor networks, based on a cooperative scheme that uses Reed–Solomon codes as network code. The block error rate of the propose...
Privacy-aware access control for message exchange in vehicular ad hoc networks
Vehicular ad hoc networks are a promising and increasingly important paradigm. Their applications range from safety enhancement to mobile entertainment services. However, their deployment requires several security issues to be resolved, particularly, since they rely on insecure wireless communication. In this paper, we propose a cryptographic-based access control framework for vehicles to secur...