{"title":"Performance analysis of amplify-and-forward cognitive relay networks under transmit power constraint and interference power constraint","authors":"Ting Feng, Xiaoxiao Zhang, Wanbin Tang, Jianquan Wang, Yantao Guo","doi":"10.1109/ATNAC.2014.7020876","DOIUrl":"https://doi.org/10.1109/ATNAC.2014.7020876","url":null,"abstract":"Cooperative relaying technology has been proved to be one of the most promising techniques to improve the throughput of CR networks. In this paper, cognitive relay networks with amplify-and-forward (AF) protocol in a spectrumsharing scenario have been considered. Compared with previous studies, we further consider the transmit power constraint on secondary source node (SS). Namely, we impose both transmit power constraint and interference power constraint on SS and secondary relay node (SR). As well we obtain the exact outage probability which works as the performance measurement of CR networks. To analyze the influential factors for system performance, the closed form expression of outage probability needs to be derived. However, it is mathematical intractable. Hence, an approximate approach is adopted as a solution. Finally, Monte-Carlo simulations are conducted to verify the accuracy of our approximation, the error sources of our analytical results are discussed as well.","PeriodicalId":396850,"journal":{"name":"2014 Australasian Telecommunication Networks and Applications Conference (ATNAC)","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129602314","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Performance of massive MIMO V-BLAST with channel correlation and imperfect CSI","authors":"Khawla A. Alnajjar, Peter J. Smith, G. Woodward","doi":"10.1109/ATNAC.2014.7020893","DOIUrl":"https://doi.org/10.1109/ATNAC.2014.7020893","url":null,"abstract":"In an uplink massive multiple-input-multiple-output (MIMO) deployment with distributed single-antenna users and a large base-station array, we consider the performance of Vertical Bell Laboratories Layered Space Time (V-BLAST) with maximum ratio combining (MRC) and V-BLAST with zero forcing (ZF). In the performance evaluation, we include the effects of imperfect channel state information (CSI) and channel correlation since these system imperfections are of particular importance in massive MIMO. The main contribution is that the performance of MRC V-BLAST is shown to approach that of ZF V-BLAST under a range of imperfect CSI levels, different channel powers and different types of array, as long as the channel correlations are not too high.","PeriodicalId":396850,"journal":{"name":"2014 Australasian Telecommunication Networks and Applications Conference (ATNAC)","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131663272","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Hiroki Murotsu, Manato Fujimoto, Tatsuya Suzuki, H. Ebara, T. Wada, H. Okada
{"title":"A novel evacuation route search algorithm for route distribution of evacuees groups in fire disasters","authors":"Hiroki Murotsu, Manato Fujimoto, Tatsuya Suzuki, H. Ebara, T. Wada, H. Okada","doi":"10.1109/ATNAC.2014.7020895","DOIUrl":"https://doi.org/10.1109/ATNAC.2014.7020895","url":null,"abstract":"A lot of people have suffered and died due to sudden disasters (fire, earthquake, terrorism, etc) in the world. In sudden disasters, it is very important for evacuees to find out appropriate evacuation routes. We previously proposed the evacuation support system named as Emergency Rescue Evacuation Support System (ERESS). This system is based on MANET and aims to dramatically reduce the number of victims in sudden disasters. This paper deals with the evacuation route search which is one of the most important functions of ERESS. In this paper, we propose a new evacuation route search algorithm for route distribution of evacuees groups in fire disasters. In this algorithm, evacuees can evacuate more safely and immediately by avoiding the congestion passage. To show the validity of the proposed algorithm, we carry out performance evaluations by computer simulations. As the results, we show that more evacuees can evacuate effectively compared with the previous route search algorithm.","PeriodicalId":396850,"journal":{"name":"2014 Australasian Telecommunication Networks and Applications Conference (ATNAC)","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126097174","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Experience with large-scale end user measurement techniques","authors":"G. Michaelson, G. Huston","doi":"10.1109/ATNAC.2014.7020864","DOIUrl":"https://doi.org/10.1109/ATNAC.2014.7020864","url":null,"abstract":"For business and strategic planning reasons, there is considerable interest in the take-up of protocols such as IPv6 and DNSSEC. Since 2010, at the Asia Pacific Network Information Centre (APNIC), we have been conducting an Internet-wide measurement of end-user IPv6 capability and preference, applying two measurement methods which use JavaScript and Flash/ActionScript to fetch non-displayed pixels in the user's browser. In 2013, we applied these measurement techniques to measure DNS behaviors. We currently collect approximately 500,000 end user measurements network-wide daily. Over 80% of the known active Autonomous System Numbers and 240 of the 250 country codes have been seen at least once in this measurement. This paper discusses the experimental methodology, the measurement experiments that have been conducted, and particular considerations arising from this large-scale measurement approach.","PeriodicalId":396850,"journal":{"name":"2014 Australasian Telecommunication Networks and Applications Conference (ATNAC)","volume":"14 1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126247355","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"A dynamic cell range expansion scheme based on fuzzy logic system in LTE-advanced heterogeneous networks","authors":"A. Daeinabi, K. Sandrasegaran, P. Ghosal","doi":"10.1109/ATNAC.2014.7020865","DOIUrl":"https://doi.org/10.1109/ATNAC.2014.7020865","url":null,"abstract":"In heterogeneous network, the coverage area of picocell is usually small due to transmission power difference between macro eNodeB (eNB) and pico eNB. As a result, the traffic load is distributed unequally which yields to macrocell overloading. In order to overcome this issue, cell range expansion (CRE) technique has been recently proposed. However, the fixed CRE scheme cannot follow the UE distribution and then satisfy the system requirements. Therefore, fixed CRE scheme is unable to proportionally offload the traffic between the macrocells and picocells. In order to deal with the mentioned problem, this paper proposes a dynamic CRE scheme based on fuzzy logic system. Simulation results demonstrate that the proposed scheme can improve the system performance in terms of throughput and outage probability.","PeriodicalId":396850,"journal":{"name":"2014 Australasian Telecommunication Networks and Applications Conference (ATNAC)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133794415","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Measuring cascade effects in coupled networks using algebraic connectivity","authors":"Sotharith Tauch, William Liu, R. Pears","doi":"10.1109/ATNAC.2014.7020870","DOIUrl":"https://doi.org/10.1109/ATNAC.2014.7020870","url":null,"abstract":"Understanding how the underlying network structure and interconnectivity impact on robustness of the coupled networks is a major challenge in complex networks studies. There are some existing metrics that can be used to measure network robustness. However, different metrics such as the average node degree, interpret different characteristic of network topological structure, especially less metrics have been identified to effectively measure the cascade performance in coupled networks. In this paper, we propose to use a combined Laplacian matrix to model the coupled networks and their interconnectivity, and then use its algebraic connectivity metric as a measure to its cascading behavior. Moreover, we have conducted extensive comparative studies among different metrics such as the average node degree, and the proposed algebraic connectivity. We have found that the algebraic connectivity metric can describe more accurate and finer characteristics on topological structure of coupled networks than other metrics widely adapted by the existing research studies for measuring the cascading performance in coupled networks.","PeriodicalId":396850,"journal":{"name":"2014 Australasian Telecommunication Networks and Applications Conference (ATNAC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127663310","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"The challenges of deploying a software defined network","authors":"Paul Zanna, S. Hosseini, P. Radcliffe, B. O'Neill","doi":"10.1109/ATNAC.2014.7020883","DOIUrl":"https://doi.org/10.1109/ATNAC.2014.7020883","url":null,"abstract":"Software Defined Networking (SDN) is an innovative approach to network architecture that provides the ability to create a whole new class of functionality. It is however still relatively experimental and therefore requires additional investigation to become a solution suitable for large-scale deployments. The deployment of SDN can be an intricate and challenging task where the ability to create sustainable solutions is paramount. This paper outlines the complexities encountered while deploying SDN in a campus network and offers new methods and techniques to networks operators considering deploying their own solution using the currently available technologies. The paper also suggests changes to the SDN architecture and specification that will remove the need for workarounds and improve overall performance and quality.","PeriodicalId":396850,"journal":{"name":"2014 Australasian Telecommunication Networks and Applications Conference (ATNAC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132795848","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Amrita Mishra, Arnab K. Pal, A. Jagannatham, K. Rajawat
{"title":"Sparse Bayesian learning-based data-aided channel estimation in STTC MIMO systems","authors":"Amrita Mishra, Arnab K. Pal, A. Jagannatham, K. Rajawat","doi":"10.1109/ATNAC.2014.7020902","DOIUrl":"https://doi.org/10.1109/ATNAC.2014.7020902","url":null,"abstract":"In this paper, we consider a sparse multipath representation of the multiple-input multiple-output (MIMO) channel matrix in terms of an overcomplete dictionary consisting of the basis spatial signature matrices which correspond to various directional cosines at the transmit and receive antenna arrays. Based on the sparse Bayesian learning (SBL) framework, we exploit the spatially sparse representation of the MIMO channel and develop a novel pilot-based channel estimation scheme for space-time trellis coded (STTC) MIMO systems. Further, we propose an enhanced SBL-based data-aided channel estimation technique utilizing the expectation-maximization (EM) framework. We demonstrate that this can be derived as an optimal minimum mean squared error (MMSE) channel estimate in the E-step followed by a modified path metric-based maximum likelihood (ML) STTC decoder in the M-step. We also derive the Bayesian Cramer-Rao bounds (BCRBs) for the SBL-based pilot and data-aided channel estimation schemes. Finally, we present simulation results to demonstrate the performance of the proposed techniques and validate the analytical bounds.","PeriodicalId":396850,"journal":{"name":"2014 Australasian Telecommunication Networks and Applications Conference (ATNAC)","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116251675","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Fog computing: A cloud to the ground support for smart things and machine-to-machine networks","authors":"I. Stojmenovic","doi":"10.1109/ATNAC.2014.7020884","DOIUrl":"https://doi.org/10.1109/ATNAC.2014.7020884","url":null,"abstract":"Cloud services to smart things face latency and intermittent connectivity issues. Fog devices are positioned between cloud and smart devices. Their high speed Internet connection to the cloud, and physical proximity to users, enable real time applications and location based services, and mobility support. Cisco promoted fog computing concept in the areas of smart grid, connected vehicles and wireless sensor and actuator networks. This survey article expands this concept to the decentralized smart building control, recognizes cloudlets as special case of fog computing, and relates it to the software defined networks (SDN) scenarios. Our literature review identifies a handful number of articles. Cooperative data scheduling and adaptive traffic light problems in SDN based vehicular networks, and demand response management in macro station and micro-grid based smart grids are discussed. Security, privacy and trust issues, control information overhead and network control policies do not seem to be studied so far within the fog computing concept.","PeriodicalId":396850,"journal":{"name":"2014 Australasian Telecommunication Networks and Applications Conference (ATNAC)","volume":"102 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122982368","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}