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7'th International Symposium on Telecommunications (IST'2014)最新文献

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Buffer-aided relay selection with inter-relay interference mitigation for successive multiple antennas relay systems 连续多天线中继系统中带中继间干扰抑制的缓冲辅助中继选择
7'th International Symposium on Telecommunications (IST'2014) Pub Date : 2014-12-31 DOI: 10.1109/ISTEL.2014.7000852
Mostafa Darabi, M. Ardebilipour, B. Maham
{"title":"Buffer-aided relay selection with inter-relay interference mitigation for successive multiple antennas relay systems","authors":"Mostafa Darabi, M. Ardebilipour, B. Maham","doi":"10.1109/ISTEL.2014.7000852","DOIUrl":"https://doi.org/10.1109/ISTEL.2014.7000852","url":null,"abstract":"In this paper, we consider a cooperative network comprising of a source node, a destination node and M amplify-and-forward half-duplex relay nodes. Both the source and destination have one antenna and each relay is equipped with N antennas. There exists a buffer at each relay in order to store the incoming data packet and retransmit it to the destination later. At each time slot, simultaneous data transmission of the source and one of the relay results in inter-relay interference (IRI). We propose a novel buffer-aided relay selection scheme which mitigates the IRI with the aid of minimum variance (MV) beamforming and the relay buffers. More specifically, at each time slot, two relays are selected to receive data from the source and to transmit data to the destination provided that the associated source-to-destination signal-to-interference-plus-noise ratio (SINR) is maximized. By simulations, we investigate the performance of the proposed policy in terms of the throughput, delay, outage probability and SER (symbol error rate). It is shown that the proposed scheme suppresses the IRI efficiently, achieves higher throughput and lower outage probability compared to the other recently proposed successive relaying policies.","PeriodicalId":417179,"journal":{"name":"7'th International Symposium on Telecommunications (IST'2014)","volume":"434 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130569520","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}
引用次数: 2
Distributed power control in multiuser MIMO networks with optimal linear precoding 基于最优线性预编码的多用户MIMO网络分布式功率控制
7'th International Symposium on Telecommunications (IST'2014) Pub Date : 2014-11-22 DOI: 10.1109/ISTEL.2014.7000890
Peyman Siyari, H. Aghaeinia
{"title":"Distributed power control in multiuser MIMO networks with optimal linear precoding","authors":"Peyman Siyari, H. Aghaeinia","doi":"10.1109/ISTEL.2014.7000890","DOIUrl":"https://doi.org/10.1109/ISTEL.2014.7000890","url":null,"abstract":"Contractive interference functions introduced by Feyzmahdavian et al. is the newest approach in the analysis and design of distributed power control laws. This approach can be extended to several cases of distributed power control. One of the distributed power control scenarios wherein the contractive interference functions have not been employed is the power control in MIMO systems. In this paper, this scenario will be analyzed. In addition, the optimal linear precoder is employed in each user to achieve maximum point-to-point information rate. In our approach, we use the same amount of signaling as the previous methods did. However, we show that the uniqueness of Nash equilibria is more probable in our approach, suggesting that our proposed method improves the convergence performance of distributed power control in MIMO systems. We also show that the proposed power control algorithm can be implemented asynchronously, which gives a noticeable flexibility to our algorithm given the practical communication limitations.","PeriodicalId":417179,"journal":{"name":"7'th International Symposium on Telecommunications (IST'2014)","volume":"25 1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128643554","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}
引用次数: 1
Bow-tie infrared antennas for solar energy collection 用于太阳能收集的领结红外天线
7'th International Symposium on Telecommunications (IST'2014) Pub Date : 2014-09-09 DOI: 10.1109/ISTEL.2014.7000695
Vahid Khoshdel, M. Shokooh-Saremi
{"title":"Bow-tie infrared antennas for solar energy collection","authors":"Vahid Khoshdel, M. Shokooh-Saremi","doi":"10.1109/ISTEL.2014.7000695","DOIUrl":"https://doi.org/10.1109/ISTEL.2014.7000695","url":null,"abstract":"In recent years, there have been a lot of progress to replace conventional photovoltaic solar cells with nano-antennas to improve the performance of solar cells. These antennas can convert solar infrared radiation into DC output by using a proper rectifier. This paper presents a bow-tie nano-antenna that works in infrared frequencies band to collect solar energy. Our goal is to design a bow-tie nano-antenna for maximum solar energy collection in infrared region. Different flare angles for bow-tie geometries are compared to each other and we studied the effect of substrate thickness on electric field enhancement. We found that electric field maximum occurs for 60° flare angle bowtie and glass thickness plays a critical role on electric field enhancement at the feeding point of the antenna.","PeriodicalId":417179,"journal":{"name":"7'th International Symposium on Telecommunications (IST'2014)","volume":"60 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131338684","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}
引用次数: 0
On the coverage region of MIMO two-hop amplify-and-forward relay network MIMO两跳放大转发中继网络的覆盖区域研究
7'th International Symposium on Telecommunications (IST'2014) Pub Date : 2014-09-09 DOI: 10.1109/ISTEL.2014.7000856
Behrooz Razeghi, G. Hodtani, S. Seyedin
{"title":"On the coverage region of MIMO two-hop amplify-and-forward relay network","authors":"Behrooz Razeghi, G. Hodtani, S. Seyedin","doi":"10.1109/ISTEL.2014.7000856","DOIUrl":"https://doi.org/10.1109/ISTEL.2014.7000856","url":null,"abstract":"We study and analyze coverage region for MIMO amplify-and-forward (AF) relay network. We consider the network geometry in which L relays are placed uniformly around the source, and assume that there is no direct link between source and destination. We analyze desired transmission rate with the purpose of maximizing coverage region. Using Monte Carlo simulations the impact of number of transceiver antennas and relay amplification factor on the coverage region is studied. Assuming that there is spatial correlation between transmit antennas and receive antennas we compare coverage region for two fading channels, i.i.d fading channel and spatially correlated fading channel. Assuming that channel state information is available at receivers (CSIR), we consider the objective of maximizing coverage region for a given rate and show numerically that spatial correlation decreases the coverage region.","PeriodicalId":417179,"journal":{"name":"7'th International Symposium on Telecommunications (IST'2014)","volume":"2011 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121421733","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}
引用次数: 6
Implementing state distribution model in asterisk server 在星号服务器中实现状态分布模型
7'th International Symposium on Telecommunications (IST'2014) Pub Date : 2014-09-09 DOI: 10.1109/ISTEL.2014.7000777
Ahmadreza Montazerolghaem, M. Moghaddam, S. Effati
{"title":"Implementing state distribution model in asterisk server","authors":"Ahmadreza Montazerolghaem, M. Moghaddam, S. Effati","doi":"10.1109/ISTEL.2014.7000777","DOIUrl":"https://doi.org/10.1109/ISTEL.2014.7000777","url":null,"abstract":"Requests in SIP (Session Initiation Protocol) usually pass through several servers. Since resources are considerably consumed to keep the state, state distribution problem is raised among several servers where the goal is to increase throughput, accessibility of servers and reduce overload. In this paper, the optimisation problem was formulated and implemented as a distributed algorithm on Asterisk proxy server which is a commercial proxy server and evaluated with Spirent traffic production device. It results in a more scalable SIP server which dynamically determines the number of SIP requests for which server is stateful and assigns state management to the server which is inferior to it for the remaining demands. The current SIP servers are statically configured such that they are stateless or stateful and don't give optimal efficiency.","PeriodicalId":417179,"journal":{"name":"7'th International Symposium on Telecommunications (IST'2014)","volume":"162 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114146198","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}
引用次数: 0
Coverage region analysis for MIMO amplify-and-forward relay channel with the source to destination link 具有源到目的链路的MIMO放大转发中继信道的覆盖区域分析
7'th International Symposium on Telecommunications (IST'2014) Pub Date : 2014-09-09 DOI: 10.1109/ISTEL.2014.7000874
Behrooz Razeghi, G. Hodtani, S. Seyedin
{"title":"Coverage region analysis for MIMO amplify-and-forward relay channel with the source to destination link","authors":"Behrooz Razeghi, G. Hodtani, S. Seyedin","doi":"10.1109/ISTEL.2014.7000874","DOIUrl":"https://doi.org/10.1109/ISTEL.2014.7000874","url":null,"abstract":"In this paper we study and analyze coverage region for half-duplex multiple-input multiple-output (MIMO) relay channel with amplify-and-forward (AF) strategy at the relay station. By assuming mixed Rayleigh and Rician fading channels with two different relay station situations, we consider the objective of maximizing coverage region for a given transmission rate and find the optimal relay location in the sense of maximizing coverage region. Using Monte Carlo simulations, the coverage region and capacity bounds are shown for different fading cases and different relay station locations. Finally, we compare our results with previous ones obtained for decode-and-forward (DF) MIMO relay channel.","PeriodicalId":417179,"journal":{"name":"7'th International Symposium on Telecommunications (IST'2014)","volume":"63 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130136270","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}
引用次数: 10
Measuring mutual aggregate uncertainty in evidence theory 证据理论中相互累积不确定度的测量
7'th International Symposium on Telecommunications (IST'2014) Pub Date : 2014-09-09 DOI: 10.1109/ISTEL.2014.7000662
A. Shahpari, S. Seyedin
{"title":"Measuring mutual aggregate uncertainty in evidence theory","authors":"A. Shahpari, S. Seyedin","doi":"10.1109/ISTEL.2014.7000662","DOIUrl":"https://doi.org/10.1109/ISTEL.2014.7000662","url":null,"abstract":"Mutual information as a tool for measuring the amount of dependency is used in many applications in probability theory. But no similar measures have been introduced to calculate the mutual uncertainty between two variables in Dempster-Shafer theory. In this paper three mutual measures based on three uncertainty measures are proposed. These uncertainty measures are: 1) Aggregate Uncertainty (AU) proposed by Klir et al.; 2) Ambiguity Measure (AM) proposed by Jousselme et al.; and 3) Modified Ambiguity Measure (MAM) that is proposed in this paper. MAM is the modification of AM that resolves the non-subadditivity problem of AM. A threat assessment problem constructed by Dempster-Shafer network is used for testing these mutual measures. We use the proposed mutual measures to identify which input variables of the network are more influential on the threat value. Finally it is concluded that mutual uncertainty based on MAM is a justifiable measure to compute the relevancy in decision making applications.","PeriodicalId":417179,"journal":{"name":"7'th International Symposium on Telecommunications (IST'2014)","volume":"81 1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134500288","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}
引用次数: 0
Opportunistic medium access in multi-session networks based on cooperative ARQ 基于协作ARQ的多会话网络中的机会媒体访问
7'th International Symposium on Telecommunications (IST'2014) Pub Date : 2014-09-09 DOI: 10.1109/ISTEL.2014.7000888
M. Mehbodnia, H. Khoshbin, Mahdi Haraty
{"title":"Opportunistic medium access in multi-session networks based on cooperative ARQ","authors":"M. Mehbodnia, H. Khoshbin, Mahdi Haraty","doi":"10.1109/ISTEL.2014.7000888","DOIUrl":"https://doi.org/10.1109/ISTEL.2014.7000888","url":null,"abstract":"Many wireless systems have leveraged the cooperation of nodes to improve network capacity. However, these approaches have left uncertainty over the performance gain of spatial diversity either with protocol overheads or unrealistic assumptions. Also more practical relay selection algorithm is required to be simple and totally distributed. In this paper, a CSMA-liked queue length based algorithm is proposed that randomly schedules ARQ relays, and involves other sessions to create network coding opportunities in erroneous hyperedges. Through partial data recovery, we exploit the probabilistic nature of wireless reception for joint cooperation, scheduling and ARQ to provide relevant gains (e.g., transmission reliability and opportunity to access to the channel) for both the source and cooperating nodes.","PeriodicalId":417179,"journal":{"name":"7'th International Symposium on Telecommunications (IST'2014)","volume":"88 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114563419","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}
引用次数: 1
Tunable beam manipulation via graphene 通过石墨烯的可调光束操纵
7'th International Symposium on Telecommunications (IST'2014) Pub Date : 2014-09-01 DOI: 10.1109/ISTEL.2014.7000698
H. Nasari, M. S. Abrishamian
{"title":"Tunable beam manipulation via graphene","authors":"H. Nasari, M. S. Abrishamian","doi":"10.1109/ISTEL.2014.7000698","DOIUrl":"https://doi.org/10.1109/ISTEL.2014.7000698","url":null,"abstract":"We discuss here the realization of electrically tunable beam focusing and splitting using a single graphene flake with operation in the terahertz regime. The required conductivity pattern along a strip on the background graphene layer for focusing and splitting phenomena is created by the proper design of an uneven ground plane. The strip is illuminated with a guided surface plasmon polaritons (SPPs) plane wave and the physical origin of the design procedure is evaluated from the phase of effective mode index of propagating SPP wave. Upon tuning the applied gate voltage between the graphene sheet and the substrate the modulation of splitting angle and focal length (FL) is achieved. Finite-Difference TimeDomain (FDTD) numerical method is employed to explore the propagation characteristic of SPP waves. Such one-atom-thick devices with the capability of electrical manipulation of light beam besides the compatibility with current planar optoelecetronic systems can find valuable potential applications in the field of transformational plasmon optics.","PeriodicalId":417179,"journal":{"name":"7'th International Symposium on Telecommunications (IST'2014)","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115121387","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}
引用次数: 0
On the global dynamics of an SEIRS epidemic model of malware propagation 恶意软件传播的SEIRS流行病模型的全局动态
7'th International Symposium on Telecommunications (IST'2014) Pub Date : 2014-09-01 DOI: 10.1109/ISTEL.2014.7000784
Soodeh Hosseini, M. A. Azgomi, A. Rahmani
{"title":"On the global dynamics of an SEIRS epidemic model of malware propagation","authors":"Soodeh Hosseini, M. A. Azgomi, A. Rahmani","doi":"10.1109/ISTEL.2014.7000784","DOIUrl":"https://doi.org/10.1109/ISTEL.2014.7000784","url":null,"abstract":"In this paper, we attempt to mathematically formulate a susceptible-exposed-infectious-recovered-susceptible (SEIRS) epidemic model to study dynamical behaviors of malware propagation in scale-free networks (SFNs). In the proposed discrete-time epidemic model, we consider defense mechanism of software diversity to limit epidemic spreading in SFNs. Dynamical behaviors of the SEIRS epidemic model is determined by basic reproductive ratio, which is often used as a threshold parameter. Also, the impact of the assignment of diverse software packages on the propagation process is examined. Theoretical results show that basic reproductive ratio is significantly dependent on diverse software packages and the network topology. The installation of diverse software packages on nodes leads to decrease reproductive ratio and malware spreading. The results of numerical simulations are given to validate the theoretical analysis.","PeriodicalId":417179,"journal":{"name":"7'th International Symposium on Telecommunications (IST'2014)","volume":"288 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121074420","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}
引用次数: 3
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