{"title":"Joint User and Relay Selection based Cooperative NOMA with Imperfect CSI","authors":"Aradhana Misra, K. K. Sarma, N. Mastorakis","doi":"10.37394/23204.2020.19.4","DOIUrl":"https://doi.org/10.37394/23204.2020.19.4","url":null,"abstract":"In this paper we consider the deployment of mobile relay nodes in a Cooperative Non Orthogonal Multiple Access (CNOMA) system with variable gain Amplify and Forward relaying. In a multiuser downlink scenario, two users are chosen as the NOMA destination pairs based on the channel quality and another suitable user is chosen to act as the relay node. Two standard relay selection protocols are examined here viz. the partial relay selection (PRS) and optimal relay selection (ORS). An outdated channel condition induced by the user mobility condition is considered in this paper and the impact of channel correlation on the system performance is analyzed. The outage performance and ergodic sum rate capacity of the users is observed under the two relay selection schemes. Further, the impact of user node velocity on the relay selection and outage performance have been reported. It is observed that the optimal relay selection has an overall better performance compared to partial relay selection. However, the impact of user velocity and time delay is lesser in case of partial relay selection. Hence, partial relay selection method has a more stable performance in case of imperfect CSI compared to optimal relay selection.","PeriodicalId":330638,"journal":{"name":"WSEAS TRANSACTIONS ON COMMUNICATIONS","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130801542","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}
C. Raghavendra, N. Harsha, S Mohanakumar, Prashantha H.S
{"title":"Joint Reduction of PMEPR and Sidelobe in Multicarrier Radar Signals using ZC and SC Method","authors":"C. Raghavendra, N. Harsha, S Mohanakumar, Prashantha H.S","doi":"10.37394/23204.2020.19.2","DOIUrl":"https://doi.org/10.37394/23204.2020.19.2","url":null,"abstract":"Employing the multitone waveforms for radar applications has attracted many authors in recent days. Several researchers have investigated the use of multitone waveform and challenges associated while implementation. The serious drawback of using multicarrier waveforms is the high Peak to Mean Envelope Power Ratio (PMEPR) values recorded and large sidelobes. To overcome PMEPR and sidelobe drawbacks a novel method is suggested for reducing sidelobe levels. The projected method applies zad-off chu phase sequence for multicarrier complementary phase coded (MCPC) signals. The comparison of integrated sidelobe ratio and peak sidelobe is obtained. Autocorrelations and complex envelope of the MCPC signal is obtained from the above methods are analyzed with extensive simulations. It is also possible to reduce the PMEPR and sidelobe simultaneously by using secondary user method. The suggested technique results with reduction in sidelobe and PMEPR levels.","PeriodicalId":330638,"journal":{"name":"WSEAS TRANSACTIONS ON COMMUNICATIONS","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132061942","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":"SHAPES Cyber Secure HealthCare Platform in Digital Environments","authors":"J. Rajamäki","doi":"10.37394/23204.2020.19.3","DOIUrl":"https://doi.org/10.37394/23204.2020.19.3","url":null,"abstract":"The SHAPES project is an ambitious endeavor that gathers stakeholders from across Europe to create, deploy and pilot at large-scale a EU-standardized open platform incorporating and integrating a broad range of solutions, including technological, organizational, clinical, educational and societal, to enable the ageing population of Europe to remain healthy, active and productive, as well as to maintain a high quality of life and sense of wellbeing for the longest time possible. The research question of this design science research (DSR) is how to build and deploy health and care (H&C) services into a future society in such a way that citizens are able to use them safely in their everyday lives? We found that considerable work is needed to develop the required architecture in smart societies: information architecture, integrations architecture, target architecture, security architecture, and security issues. Service chains must be checked against the architectures to ensure no risks are present","PeriodicalId":330638,"journal":{"name":"WSEAS TRANSACTIONS ON COMMUNICATIONS","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126373429","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":"An Optimal Cluster-Head Selection algorithm for Wireless Sensor Networks","authors":"J. Khushboo, A. Bhola","doi":"10.37394/23204.2020.19.1","DOIUrl":"https://doi.org/10.37394/23204.2020.19.1","url":null,"abstract":"The energy utilization is one of the most common challenges in Wireless Sensor Network (WSN), as frequent communication between the sensor nodes (SNs) results in huge energy drain. Moreover, optimization and load balancing within the WSN are the significant concern to grant intellect for the extensive period of network lifetime. As a matter of fact, many WSNs are deployed and operating outdoors is exposed to varying environmental conditions, which may further set grounds for severe performance degradation of such networks. Therefore, it is necessary to take into consideration the factors like radio signal strength in order to reduce the impact and to adapt to varying environmental conditions. Since clustering is a topological control technique to reduce the activity of SNs transceivers, it extensively increases overall system scalability and energy efficiency. It selects CH to manage the entire network to achieve longevity in WSN. In this paper, we present an optimal CH selection (OCHS) algorithm which is also based on environmental conditions to achieve energy efficiency and enhanced network lifetime. The originality of this work is that we have taken into consideration the received signal strength index (RSSI) of SNs from the base-station (BS). The OCHS algorithm mainly focuses on maximizing the network lifetime based on RSSI values and residual energy levels of SNs. TheOCHS algorithm is simulated on Cooja Simulator and its performance is compared with existing LEACH and HEED protocols. Simulation analysis and results proved that our OCHS algorithm can effectively enhance the network lifetime by two times and thus it is an energy-efficient way to choose a CH.","PeriodicalId":330638,"journal":{"name":"WSEAS TRANSACTIONS ON COMMUNICATIONS","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122323415","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}
M. Reyes-Ayala, E. A. Andrade-Gonzalez, N. Reyes-Ayala, H. Terres-Peña
{"title":"Rectangular Microstrip Antennas – A Tutorial","authors":"M. Reyes-Ayala, E. A. Andrade-Gonzalez, N. Reyes-Ayala, H. Terres-Peña","doi":"10.37394/23204.2020.19.22","DOIUrl":"https://doi.org/10.37394/23204.2020.19.22","url":null,"abstract":"In this paper a full review and tutorial of Rectangular Microstrip Antennas (RMA) are carried out. The most important models of this sort of antennas are analyzed in this article and are present in a relevance order: transmission line, cavity model and full-wave. With the aim of supporting educational purposes and training in antenna design, some useful response plots are included and compared with full-wave simulations in both cases, before and after the structure optimization. The main results of this work were contrasted using returning losses and antenna directivity, for some practical variations of the dielectric constant and thickness of the substrate. Antenna patterns and return losses were also simulated and optimized using a full-wave simulation tool","PeriodicalId":330638,"journal":{"name":"WSEAS TRANSACTIONS ON COMMUNICATIONS","volume":"3 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":"122346624","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":"On a Strategy of Mobile Networks Synthesis","authors":"V. Lyandres","doi":"10.37394/23204.2021.20.13","DOIUrl":"https://doi.org/10.37394/23204.2021.20.13","url":null,"abstract":"Effective design of mobile communication network includes optimization of two bounded together processes: the network base stations placement and the channel assignment. In real environments the well-known cellular concept fails due to not uniformly spaced traffic and not isotropic wave propagation. We find a rather universal method for synthesis of a close to optimal network structure. The proposed design approach is based on the idea of adaptive vector quantization for a map with random traffic. As a result, the service zone of the network becomes discrete and is being transformed to a map with not equal cells and approximately equal number of requests in every one. This fact allows to apply the simplest periodic reuse pattern. The algorithm finds a point with minimal average Euclidean distance from all its requests. This point defines optimal placement of the corresponding base station. The approach guarantees maximum coverage","PeriodicalId":330638,"journal":{"name":"WSEAS TRANSACTIONS ON COMMUNICATIONS","volume":"9 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":"114489003","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}
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