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Power control algorithm for cognitive radio systems

Power control algorithm for cognitive radio systems

引用

14th international conference on Computer and Information Technology, ICCIT 2011

作者： Rana, Md. Masud Department of Electronics and Communication Engineering Khulna University of Engineering and Technology Bangladesh

ISBN: (纸本)9781612849065

Cognitive radio (CR) is the enabling technology for dynamic spectrum access, which may potentially mitigate the radio spectrum scarcity problem encountered in many countries. this paper is concerned with power allocation spectrum sharing CR networks, where a secondary user (SU) communicates simultaneously over the same frequency band with an existing primary users (PUs) link. In addition, this method uses PU feedback information. It is assumed that the SU transmitter has the perfect channel state information (CSI) on the fading channels from SU transmitter to both PU and SU receivers, as well as the fading channel from PU transmitter to PU receiver. Furthermore, the proposed method takes into account the statistical variation of the signal to interference plus noise ratio (SINR) of each transmitter/receiver pair and optimally allocates power to minimize probability of fading-induced outage probability. Such approaches can guarantee convergence towards the optimal solution with an acceptable convergence speed. therefore, equipment designers and system operators can use their judgment to find the best SU pairs to meet their specific needs. Simulation results are provided for the optimal power control performance. © 2011 IEEE.

关键词： Cognitive radio

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A synopsis of self-healing functions in wireless networks

A synopsis of self-healing functions in wireless networks

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14th IEEE international Multitopic conference 2011, INMIC 2011

作者： Kamal, Kasma Azizan Ahsenali Chaudhry, Junaid Ali, Saqib Ahmad, Mudassar Ngadi, Md Asri Bin Hanan Abdullah, Abdul Department of CS and Communication Faculty of CS and IS Universiti Teknologi Malaysia Skudai 81310 Johor Malaysia Department of Computer Science Faculty of Sciences University of Agriculture Faisalabad Pakistan

ISBN: (纸本)9781457706554

In early 20th century when technology evolve, the performance of systems suffered from the problems of complexity, increasing cost of maintenance and software of hardware failure caused by unpredictable behavior and poor manageability. this fostered researchers to discover new design and techniques that enable the systems to operate autonomously. In 2001, IBM introduces self-managing capabilities (self-organizing, self-healing, self-optimization and self-protection) with autonomous behavior. In this survey, the main concerns are self-healing autonomic computing. Self-healing is an autonomic computing system that detects and diagnoses errors without the need of human intervention. A number of concepts, techniques and functions have been developed in different application areas of self-healing. this survey gives an overview about some approaches and solutions of past and current research in self-healing classified to operating system, routing, security and web services. these proposed approaches and solutions were developed to solve the problems that arise in manual intervention system. To achieve the perfect of self-healing behaviors, its remains an open and significant challenge that can be accomplished through a combination of process changes, new technologies and architecture and open industry standards. © 2011 IEEE.

关键词： Surveys

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Social Environments, Mixed communication and Goal-Oriented Control Application Using a Brain-Computer Interface

Social Environments, Mixed Communication and Goal-Oriented C...

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6th international conference on Universal Access in Human-Computer Interaction (UAHCI)/14th international conference on Human-Computer Interaction (HCI)

作者： Edlinger, Guenter Guger, Christoph G Tec Med Engn GmbH Herbersteinstr 60 A-8020 Graz Austria Guger Technol OG A-8020 Graz Austria

ISBN: (纸本)9783642216626;9783642216633

For this study a P300 BCI speller application framework served as a base to explore the operation for three different applications. Subjects exchanged messages in the networks of (i) Twitter (Twitter Inc.) and socialized with other residents in Second Life (Linden Lab) and (ii) controlled a virtual smart home. Although the complexity of the various applications varied greatly, all three applications yielded similar results which are interesting for the general application of BCI for communication and control: (a) icons can be used together with characters in the interface masks and (b) more crucially, the BCI system does not need to be trained on each individual symbol and allows the use of icons for many different tasks without prior time consuming and boring training for each individual icon. Hence such a type of BCI system is more optimally suited for goal oriented control amongst currently available BCI systems.

关键词： Brain-Computer Interface P300 evoked potential EEG BCI

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Low-complexity wireless communication modeling for information flow control in sensor networks

Low-complexity wireless communication modeling for informati...

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作者： Van Foeken, E. Kwakkernaat, M.R.J.A.E. TNO Technical Sciences Den Haag Netherlands University of Amsterdam Amsterdam Netherlands TNO Technical Sciences Helmond Netherlands

ISBN: (纸本)9781457702679

the increasing demand for shared awareness in multi-platform sensor systems requires advanced wireless information sharing techniques. the analysis of these techniques requires information about communication resources and latency to be available in models. the work presented here introduces generic low complexity models that describe the probability of latency and the required resources in terms of communication costs. the models are meant to be used in highly realistic simulation scenarios. therefore and for making them generic for a broad spectrum of scenarios the models are made as simple as possible. Nonetheless, they maintain the most important features of communication techniques. the models are meant to estimate the dynamic communication situation. Subsequently resource management can be used for more efficient and effective communication. the results show that real-time estimation enables grounded decision-making about whom to communicate with and that resource management enables changing the probability of delay and cost of communication. © 2011 IEEE.

关键词： Decision making

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A survey of vehicular-based cooperative traffic information systems

A survey of vehicular-based cooperative traffic information ...

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international conference on Intelligent Transportation

作者： Marcin Seredynski Pascal Bouvry Interdisciplinary Centre of Security Reliability and Trust University of Luxembourg Luxembourg Luxembourg Faculty of Sciences Technology and Communication University of Luxembourg Luxembourg

this paper summarises the research on cooperative traffic information systems based on vehicular ad hoc networks. Such systems are a promising concept for exchanging traffic information among vehicles. their application enables reductions in fuel consumption, greenhouse gas emissions and travel time. three classes of such systems are studied: infrastructureless solutions based on inter-vehicle communication, infrastructure-based solutions relying on the peer-to-peer paradigm and infrastructure-based systems using client-server architectures. systems within each class are briefly introduced and their strengths and weaknesses are analysed.

关键词： Vehicles Roads Peer to peer computing Information systems Internet Wireless communication Ad hoc networks

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Intersection collision avoidance system using infrastructure communication

Intersection collision avoidance system using infrastructure...

引用

international conference on Intelligent Transportation

作者： Fadi Basma Yehia Tachwali Hazem H Refai University of Oklahoma Tulsa OK USA

Nearly one third of all documented vehicle collisions are reported at urban and rural intersections, and this number continues to rise in spite of technological innovations for vehicle safety. Most collision avoidance systems currently under investigation are based on road-vehicle or inter-vehicle communication. However, reliability remains an issue, as high mobility often leads to message collisions and link breakage. In this paper reliable, real-time intersection collision avoidance (ICA) system based solely on infrastructure communication is proposed. ICA utilizes telematics and wireless sensor networks (WSN) to monitor approaching traffic, detect possible collision, and then transfer information to drivers, warning them of high collision probability.

关键词： Vehicles Wireless sensor networks Clocks Alarm systems Synchronization Collision avoidance Transceivers

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Survey of Trust Based communications in Social networks

Survey of Trust Based Communications in Social Networks

引用

international conference on Network-Based Information systems (NBIS)

作者： Pawat Chomphoosang Ping Zhang Arjan Durresi Leonard Barolli Department of Computer and Information Science Indiana University Purdue University Indianapolis Indianapolis IN USA Department of Information and Communication Engineering Fukuoka Institute of Technology Fukuoka Japan

Social networking is become important component of our daily lives. People use them to share important personal data. However, most users do not fully realize the security implications of using social networks. Furthermore, social networks are vulnerable to many security attacks. One major threat remains the alteration of data in social networks. In this paper we review several techniques to protect the content of data in social networking.

关键词： Watermarking Copyright protection Cryptography Robustness Privacy Digital images

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An Implementation and Evaluation of Zone-Based Routing Protocol for Mobile Ad-Hoc networks

An Implementation and Evaluation of Zone-Based Routing Proto...

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international conference on Network-Based Information systems (NBIS)

作者： Haruki Osanai Akio Koyama Leonard Barolli Department of Informatics Graduate School of Science and Engineering Yamagata University Yonezawa Japan Department of Information and Communication Engineering Fukuoka Institute of Technology Fukuoka Japan

In Mobile Ad-hoc networks (MANET), the nodes intercommunicate through single-hop and multi-hop paths in a peer-to-peer fashion. Intermediate nodes between two pairs of communication nodes act as routers. thus, the routing protocols play an important role for construction of MANET. though the research of the routing protocol for MANET is actively done, most performance evaluations are evaluated via simulation. In this research, we implemented the zone-based routing protocol called ZRP and EZRP to real machines and evaluated by real environment. In the evaluation results, we showed that EZRP which is our proposed protocol has better performance than ZRP.

关键词： Routing Routing protocols Peer to peer computing Tin Mobile communication Relays

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Secure Clustering for Building Certificate Management Nodes in Ad-Hoc Network

Secure Clustering for Building Certificate Management Nodes ...

引用

international conference on Network-Based Information systems (NBIS)

作者： Iichiro Nishimura Tomoyuki Nagase Youjiro Takehana Yoshio Yoshioka Graduate School of Science and Technology Hirosaki University Hirosaki Aomori Japan

Ad hoc networks have emerged from wireless technology, which consist of wireless nodes with absence of a stationary infrastructure. these networks are inherently vulnerable to security attacks from malicious users. therefore, providing distinct security for ad hoc networks becomes a primary concern and requires several challenges to be achieved. One main challenge is how to manage public keys' certificates among ad hoc nodes. this paper introduces a fast and secure clustering scheme by select candidate's nodes using voting method, this method is to select certificates management node which manages certificates on behave of other nodes in ad hoc network.

关键词： Ad hoc networks Routing Public key Wireless communication Routing protocols

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Authentication and Certificate Managements of Unauthorized Intrusion in Ad-Hoc networks, Problems and Solutions

Authentication and Certificate Managements of Unauthorized I...

引用

international conference on Network-Based Information systems (NBIS)

作者： Norihito Yosaka Iichiro Nishimura Tomoyuki Nagase Graduate School of Science and Technology Hirosaki University Hirosaki Aomori Japan

the development of today's wireless technology with its sophisticated devices and applications has attracted many users and becoming more important in their daily life. Ad hoc networks have emerged from this technology to provide new services to mobile users. In contrast with conventional wireless networks, ad hoc networks are not connected to any stationary infrastructure. Furthermore, the mobility functions, such as routing, connection's decisions and security managements, are performed by the nodes themselves independently. therefore, the security problem for mobile ad hoc networks is becoming one of the major issues that need to be solved. the security of ad hoc networks is based on certification authority (CA) which issues and manages security certificates and public keys for message encryption. this paper introduces a new method of detecting unauthorized intrusion that is used by malicious user who issues a forged certificate to join a group of ad hoc network. this method also eliminates unnecessary certificates exchange among users' nodes to reduce traffic flow inside the network.

关键词： Public key Authentication Ad hoc networks Memory management Mobile communication Certification

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