Full-length non-linear binary sequences with Zero Correlation Zone for multiuser communications

none3noThe research on new sets of sequences that can be applied as spreading codes in multiple user communications is still an active area, even if this topic has been extensively investigated since long time. In fact, new communication paradigms like dense and decentralized wireless networks, where there is no central controller to assign the resources to the nodes, are revamping the interest on finding large sets of sequences providing adequate correlation properties to support a big number of nodes, in potentially hostile channels. This paper focuses on the Zero Correlation Zone (ZCZ) property exhibited by a family of nonlinear binary sequences featuring a great cardinality of their set, and good security-related features, and provides evidence of their suitability to multiuser communications, in channels affected by multipath.Sarayloo, M.; Gambi, E.; Spinsante, S.Sarayloo, Mahdiyar; Gambi, Ennio; Spinsante, Susann

Full-length non-linear binary sequences with Zero Correlation Zone for multiuser communications

The research on new sets of sequences to be used asspreading codes in multiple user communications is still an activearea, despite the great amount of literature available since manyyears on this topic. In fact, new paradigms like dense anddecentralized wireless networks, where there is no centralcontroller to assign the resources to the nodes, are revamping theinterest on large sets of sequences providing adequate correlationproperties to support a big number of nodes, in potentially hostilechannels. This paper focuses on the Zero Correlation Zone (ZCZ)property exhibited by a family of non-linear binary sequencesfeaturing a great cardinality of their set and good securityrelatedfeatures, and provides evidence of their suitability tomultiuser communications, in channels affected by multipath

Binary De Bruijn sequences for DS-CDMA systems: analysis and results

Abstract Code division multiple access (CDMA) using direct sequence (DS) spread spectrum modulation provides multiple access capability essentially thanks to the adoption of proper sequences as spreading codes. The ability of a DS-CDMA receiver to detect the desired signal relies to a great extent on the auto-correlation properties of the spreading code associated to each user; on the other hand, multi-user interference rejection depends on the cross-correlation properties of all the spreading codes in the considered set. As a consequence, the analysis of new families of spreading codes to be adopted in DS-CDMA is of great interest. This article provides results about the evaluation of specific full-length binary sequences, the De Bruijn ones, when applied as spreading codes in DS-CDMA schemes, and compares their performance to other families of spreading codes commonly used, such as m-sequences, Gold, OVSF, and Kasami sequences. While the latter sets of sequences have been specifically designed for application in multi-user communication contexts, De Bruijn sequences come from combinatorial mathematics, and have been applied in completely different scenarios. Considering the similarity of De Bruijn sequences to random sequences, we investigate the performance resulting by applying them as spreading codes. The results herein presented suggest that binary De Bruijn sequences, when properly selected, may compete with more consolidated options, and encourage further investigation activities, specifically focused on the generation of longer sequences, and the definition of correlation-based selection criteria

Proceedings of the Third Edition of the Annual Conference on Wireless On-demand Network Systems and Services (WONS 2006)

Ce fichier regroupe en un seul documents l'ensemble des articles accéptés pour la conférences WONS2006/http://citi.insa-lyon.fr/wons2006/index.htmlThis year, 56 papers were submitted. From the Open Call submissions we accepted 16 papers as full papers (up to 12 pages) and 8 papers as short papers (up to 6 pages). All the accepted papers will be presented orally in the Workshop sessions. More precisely, the selected papers have been organized in 7 session: Channel access and scheduling, Energy-aware Protocols, QoS in Mobile Ad-Hoc networks, Multihop Performance Issues, Wireless Internet, Applications and finally Security Issues. The papers (and authors) come from all parts of the world, confirming the international stature of this Workshop. The majority of the contributions are from Europe (France, Germany, Greece, Italy, Netherlands, Norway, Switzerland, UK). However, a significant number is from Australia, Brazil, Canada, Iran, Korea and USA. The proceedings also include two invited papers. We take this opportunity to thank all the authors who submitted their papers to WONS 2006. You helped make this event again a success

Mobile Ad-Hoc Networks

Being infrastructure-less and without central administration control, wireless ad-hoc networking is playing a more and more important role in extending the coverage of traditional wireless infrastructure (cellular networks, wireless LAN, etc). This book includes state-of the-art techniques and solutions for wireless ad-hoc networks. It focuses on the following topics in ad-hoc networks: vehicular ad-hoc networks, security and caching, TCP in ad-hoc networks and emerging applications. It is targeted to provide network engineers and researchers with design guidelines for large scale wireless ad hoc networks

Developing a usable security approach for user awareness against ransomware

This thesis was submitted for the award of Doctor of Philosophy and was awarded by Brunel University LondonThe main purpose of the research presented in this thesis is to design and develop a game prototype for improving user awareness against ransomware, which has been reported as the most significant cyber security threat to the United Kingdom by the National Cyber Security Centre. Digital transformation is helping individuals, organisations, governments and Industrial control systems to modernise and improve their effectiveness. At the same time, cyber crimes are evolving and targeting essential services. A successful cyber attack can compromise users’ privacy, bring bad publicity and financial damage to organisations and target national security. A literature review was conducted to understand threats to the cyber social system. Literature in this thesis reports attackers exploit humans as the weakest link to execute successful security breaches. Therefore to address this challenge, a significant gap has been identified as an opportunity to contribute to user awareness of the ransomware cyber security threat. The current thesis proposes RansomAware a novel game prototype to improve user awareness. The game is based on Technology Threat Avoidance Theory (TTAT) model. In this thesis two studies are carried out, study 1 empirically validates the elements of TTAT to be embedded in the RansomAware prototype and reports a significant change in users’ motivation to avoid ransomware cyber security threat 55% and avoidance behaviour 29%, whereas study 2 evaluates game usability and report significant results of SUS average score of 87.58 and statistical results of p < 0.01 indicate user’s satisfaction of the RansomAware. Finally, the research provides guidelines on how the proposed RansomAware game can be adopted by practitioners and individuals to improve their awareness against the ransomware cyber security threat

Enhancing SET Teaching at Level 3

The initial source of motivation for this report was the national response to the Commission on Adult Vocational Teaching and Learning (CAVTL) Report It’s All About Work (2013), and it addresses an issue that remains relevant to the current discussion about the creation of Professional and Technical Pathways to employment - the contribution that excellent vocational teaching and learning makes to the development of the forms of expertise that employers’ require and that facilitate learners’ continuing employability. In the course of discussions between the Gatsby Foundation and the research team the following rationale, focus and outcome was agreed. In the case of the former, to develop a conceptual framework to investigate vocational pedagogy that drew on insights from the academic and grey literature and, in the case of focus, to use that framework to investigate learning and teaching in Science, Engineering and Technology (SET) programmes at Level 3 in a variety of SET contexts. In order to do so, it was recognised that it would be important for the research team to take account of the way in which colleges respond to known as well as emerging employer demand for SET skills