Pub Date : 2013-05-06DOI: 10.1109/ICTEL.2013.6632087
Amin Gholoobi, S. Stavrou
One of the main advantages when comparing time over signal strength localization methods, is that the former do not require the creation of fingerprint databases. On the other hand, the majority of time based methods require some sort of clock synchronization due to the drifting of the local clocks. This paper presents an innovative time-based localization method which utilizes the information provided by 802.11 Beacon packet data. The advantage of this method over other time based methods is that the Mobile Terminal (MT) does not require to establish a connection to an Access Point (AP), or to send and receive packets as other time based methods do. Also, the proposed method does not require any clock synchronization. The method works by analyzing Beacon timestamp and MAC timestamp. By using Beacon Interval, Beacon timestamp and Service Set Identifier (SSID) of a packet, it has been made possible to optimally process the collected MAC timestamps to provide a hybrid TDoA-ToA localization method with an average error of less than 2.5 meters.
{"title":"A hybrid TDoA-ToA localization method","authors":"Amin Gholoobi, S. Stavrou","doi":"10.1109/ICTEL.2013.6632087","DOIUrl":"https://doi.org/10.1109/ICTEL.2013.6632087","url":null,"abstract":"One of the main advantages when comparing time over signal strength localization methods, is that the former do not require the creation of fingerprint databases. On the other hand, the majority of time based methods require some sort of clock synchronization due to the drifting of the local clocks. This paper presents an innovative time-based localization method which utilizes the information provided by 802.11 Beacon packet data. The advantage of this method over other time based methods is that the Mobile Terminal (MT) does not require to establish a connection to an Access Point (AP), or to send and receive packets as other time based methods do. Also, the proposed method does not require any clock synchronization. The method works by analyzing Beacon timestamp and MAC timestamp. By using Beacon Interval, Beacon timestamp and Service Set Identifier (SSID) of a packet, it has been made possible to optimally process the collected MAC timestamps to provide a hybrid TDoA-ToA localization method with an average error of less than 2.5 meters.","PeriodicalId":430600,"journal":{"name":"ICT 2013","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123507035","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}
Pub Date : 2013-05-06DOI: 10.1109/ICTEL.2013.6632132
Xiaofeng Qiu, Lei Cao, Pengfei Li, Liang Zhao
With the rapid pace of globalization and outsourcing, supply chain integrity of ICT system is gaining more and more attentions. Integrity of ICT Supply Chain has a slightly different focus from network security. Due to the increasing complexity and formidable cost and timing, it's by no means enough to guarantee the integrity of a modern ICT product through technical testing and vendor screening. An architectural approach, named as Architectural Solution Integration (ASI), has been proposed to improve the supply chain integrity during the topology design stage of ICT systems. In this paper, the architecture design methodology for ASI is proposed. Supplier trust model and supply chain integrity model are established with an algorithm based on ranked attack graph to quantitatively evaluate the integrity of ICT supply chain. Finally, a case study is presented to demonstrate the feasibility of the proposed ICT supply chain integrity model and evaluation algorithm, which are the key elements of the ASI approach.
{"title":"Architecture approach for ICT supply chain integrity","authors":"Xiaofeng Qiu, Lei Cao, Pengfei Li, Liang Zhao","doi":"10.1109/ICTEL.2013.6632132","DOIUrl":"https://doi.org/10.1109/ICTEL.2013.6632132","url":null,"abstract":"With the rapid pace of globalization and outsourcing, supply chain integrity of ICT system is gaining more and more attentions. Integrity of ICT Supply Chain has a slightly different focus from network security. Due to the increasing complexity and formidable cost and timing, it's by no means enough to guarantee the integrity of a modern ICT product through technical testing and vendor screening. An architectural approach, named as Architectural Solution Integration (ASI), has been proposed to improve the supply chain integrity during the topology design stage of ICT systems. In this paper, the architecture design methodology for ASI is proposed. Supplier trust model and supply chain integrity model are established with an algorithm based on ranked attack graph to quantitatively evaluate the integrity of ICT supply chain. Finally, a case study is presented to demonstrate the feasibility of the proposed ICT supply chain integrity model and evaluation algorithm, which are the key elements of the ASI approach.","PeriodicalId":430600,"journal":{"name":"ICT 2013","volume":"154 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123273281","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}
Pub Date : 2013-05-06DOI: 10.1109/ICTEL.2013.6632114
S. Nezamalhosseini, M. A. Sedaghat, F. Marvasti, M. Ghassemian
In this article, the authors introduce and propose an overloaded Synchronous Optical Code Division Multiple Access (SOCDMA) based on Unipolar Walsh Code (UWC) for fiberoptic communication systems. Given L as the number of chips, it is shown that 2L - 2 active users can be supported by the proposed system. In this system the users of the network are categorized into two groups. Users of each group transmit at the same power level but different from the level of the other group's users. Using the UWC properties we propose a simple receiver that cancels multiple-user interference (MUI) completely. Moreover, we obtain the optimal power level of each group in order to minimize the probability of error for a given average transmit power. We demonstrate that the proposed receiver has an acceptable performance compared to the optimum multiuser receiver.
{"title":"Interference cancellation in overloaded optical CDMA systems using unipolar walsh codes","authors":"S. Nezamalhosseini, M. A. Sedaghat, F. Marvasti, M. Ghassemian","doi":"10.1109/ICTEL.2013.6632114","DOIUrl":"https://doi.org/10.1109/ICTEL.2013.6632114","url":null,"abstract":"In this article, the authors introduce and propose an overloaded Synchronous Optical Code Division Multiple Access (SOCDMA) based on Unipolar Walsh Code (UWC) for fiberoptic communication systems. Given L as the number of chips, it is shown that 2L - 2 active users can be supported by the proposed system. In this system the users of the network are categorized into two groups. Users of each group transmit at the same power level but different from the level of the other group's users. Using the UWC properties we propose a simple receiver that cancels multiple-user interference (MUI) completely. Moreover, we obtain the optimal power level of each group in order to minimize the probability of error for a given average transmit power. We demonstrate that the proposed receiver has an acceptable performance compared to the optimum multiuser receiver.","PeriodicalId":430600,"journal":{"name":"ICT 2013","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126351778","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}
Pub Date : 2013-05-06DOI: 10.1109/ICTEL.2013.6632160
J. Riihijarvi, P. Mahonen
In this paper we study different methods for characterizing the complexity of the radio environment. Of the various definitions of complexity, we focus on the predictability of received power as a function of the receiver location. Such measures are of interest in estimating the compressibility of radio environment maps as well as for establishing sampling strategies for mobile-centric coverage measurement approaches, such as minimization of drive tests. As a case study, we explore different complexity metrics for DVB-T coverage over Germany using realistic terrain-aware propagation estimates. Based on these we show that the underlying transmitter locations as well as the propagation environment play a major role in the radio environmental complexity. Our results also show that for most cases of interest the radio environmental data is highly compressible, much more so than would be expected from simple spatial models. We also discuss the practical implications of our results for MDT-like approaches, as well as outline directions for future research.
{"title":"Measures of complexity for the radio environment","authors":"J. Riihijarvi, P. Mahonen","doi":"10.1109/ICTEL.2013.6632160","DOIUrl":"https://doi.org/10.1109/ICTEL.2013.6632160","url":null,"abstract":"In this paper we study different methods for characterizing the complexity of the radio environment. Of the various definitions of complexity, we focus on the predictability of received power as a function of the receiver location. Such measures are of interest in estimating the compressibility of radio environment maps as well as for establishing sampling strategies for mobile-centric coverage measurement approaches, such as minimization of drive tests. As a case study, we explore different complexity metrics for DVB-T coverage over Germany using realistic terrain-aware propagation estimates. Based on these we show that the underlying transmitter locations as well as the propagation environment play a major role in the radio environmental complexity. Our results also show that for most cases of interest the radio environmental data is highly compressible, much more so than would be expected from simple spatial models. We also discuss the practical implications of our results for MDT-like approaches, as well as outline directions for future research.","PeriodicalId":430600,"journal":{"name":"ICT 2013","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125922646","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}
Pub Date : 2013-05-06DOI: 10.1109/ICTEL.2013.6632144
Moataz M. H. El Ayadi, M. H. Ismail
In this paper, we propose novel simple-to-calculate lower and upper bounds on the probability of error for dual-branch equal-gain combining (EGC) and maximal ratio combining (MRC) diversity receivers with α-μ fading and linear modulations. For deriving such bounds, we derive lower and upper bounds for the cumulative distribution function (CDF) of the sum of two independent and non identically distributed α-μ random variables (RVs). The CDF bounds are given in the form of finite series of normalized incomplete Gamma functions and, unlike many in the literature, do not require any look up tables or solving transcendental equations to be obtained. We present extensive numerical results for different combinations of the parameters α and μ and show that the proposed bounds on the CDF and the probability of error are very tight when compared to the exact quantities.
{"title":"Novel simple bounds on the probability of error for EGC and MRC diversity receivers over α-μ fading","authors":"Moataz M. H. El Ayadi, M. H. Ismail","doi":"10.1109/ICTEL.2013.6632144","DOIUrl":"https://doi.org/10.1109/ICTEL.2013.6632144","url":null,"abstract":"In this paper, we propose novel simple-to-calculate lower and upper bounds on the probability of error for dual-branch equal-gain combining (EGC) and maximal ratio combining (MRC) diversity receivers with α-μ fading and linear modulations. For deriving such bounds, we derive lower and upper bounds for the cumulative distribution function (CDF) of the sum of two independent and non identically distributed α-μ random variables (RVs). The CDF bounds are given in the form of finite series of normalized incomplete Gamma functions and, unlike many in the literature, do not require any look up tables or solving transcendental equations to be obtained. We present extensive numerical results for different combinations of the parameters α and μ and show that the proposed bounds on the CDF and the probability of error are very tight when compared to the exact quantities.","PeriodicalId":430600,"journal":{"name":"ICT 2013","volume":"173 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128149285","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}
Pub Date : 2013-05-06DOI: 10.1109/ICTEL.2013.6632150
Kais Ben Fredj, S. Aïssa
This paper studies the performance of a two-way relay-based communication system with opportunistic relay selection in Nakagami-m fading environment. The two source nodes, using different modulation schemes for transmission, are unable to exchange data in direct line-of-sight and proceed via L relay terminals. A “best relay”, chosen by means of opportunistic selection, combines the received signals in a way that allows both sources to decode it. We provide a closed-form expression for the probability density function of the link between the “selected” best relay and each source node, and use this result to derive the average symbol error probability in closed-form. This result is further approximated for the higher signal-to-noise ratio regions and used to provide closed-form expressions for the optimized power allocated to each node involved in the communication process. We asset our formulae with numerical results and interpretations to complete this work.
{"title":"Performance and optimization of two-way relaying under Nakagami-m fading","authors":"Kais Ben Fredj, S. Aïssa","doi":"10.1109/ICTEL.2013.6632150","DOIUrl":"https://doi.org/10.1109/ICTEL.2013.6632150","url":null,"abstract":"This paper studies the performance of a two-way relay-based communication system with opportunistic relay selection in Nakagami-m fading environment. The two source nodes, using different modulation schemes for transmission, are unable to exchange data in direct line-of-sight and proceed via L relay terminals. A “best relay”, chosen by means of opportunistic selection, combines the received signals in a way that allows both sources to decode it. We provide a closed-form expression for the probability density function of the link between the “selected” best relay and each source node, and use this result to derive the average symbol error probability in closed-form. This result is further approximated for the higher signal-to-noise ratio regions and used to provide closed-form expressions for the optimized power allocated to each node involved in the communication process. We asset our formulae with numerical results and interpretations to complete this work.","PeriodicalId":430600,"journal":{"name":"ICT 2013","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132108727","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}
Pub Date : 2013-05-06DOI: 10.1109/ICTEL.2013.6632071
Zhicheng Dong, P. Fan, E. Panayirci
In this paper, an iterative and computationally efficient data detection algorithm is proposed based on the space alternating generalized expectation maximization (SAGE) technique for orthogonal division multiplexing (OFDM) systems under fast fading channels. The proposed detector includes the original detector presented in [1] as one of its special cases. With a proper choice of its parameters, simulations show that the new detector has negligible performance loss than original one in [1] with smaller number of iterations.
{"title":"An efficient SAGE-based data detection algorithm for OFDM systems in the presence of very fast fading channels","authors":"Zhicheng Dong, P. Fan, E. Panayirci","doi":"10.1109/ICTEL.2013.6632071","DOIUrl":"https://doi.org/10.1109/ICTEL.2013.6632071","url":null,"abstract":"In this paper, an iterative and computationally efficient data detection algorithm is proposed based on the space alternating generalized expectation maximization (SAGE) technique for orthogonal division multiplexing (OFDM) systems under fast fading channels. The proposed detector includes the original detector presented in [1] as one of its special cases. With a proper choice of its parameters, simulations show that the new detector has negligible performance loss than original one in [1] with smaller number of iterations.","PeriodicalId":430600,"journal":{"name":"ICT 2013","volume":"284 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133499136","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}
Pub Date : 2013-05-06DOI: 10.1109/ICTEL.2013.6632109
T. Prakoso, R. Ngah, T. A. Rahman, Zabih Ghassemlooy
The introduction of new wireless access technologies in the crowded spectrum requires wireless infrastructures and user equipments to provide multiband and multiservice capabilities. One approach to cope with this challenge is to design a broadband microwave-photonic access-point that covers all required bands. This paper investigates isolation enhancement of miniaturized antenna-pair used in the broadband system. Among available isolation enhancement techniques, defected-ground (or ground-slot) and ground-stub are chosen due to their wideband feature. The simulations and measurements conducted to printed monopole antenna pairs show that the chosen techniques are effective in improving isolation between uplink and downlink antenna pair.
{"title":"Isolation enhancement and size reduction of printed-antenna pairs for broadband microwave-photonic access-point","authors":"T. Prakoso, R. Ngah, T. A. Rahman, Zabih Ghassemlooy","doi":"10.1109/ICTEL.2013.6632109","DOIUrl":"https://doi.org/10.1109/ICTEL.2013.6632109","url":null,"abstract":"The introduction of new wireless access technologies in the crowded spectrum requires wireless infrastructures and user equipments to provide multiband and multiservice capabilities. One approach to cope with this challenge is to design a broadband microwave-photonic access-point that covers all required bands. This paper investigates isolation enhancement of miniaturized antenna-pair used in the broadband system. Among available isolation enhancement techniques, defected-ground (or ground-slot) and ground-stub are chosen due to their wideband feature. The simulations and measurements conducted to printed monopole antenna pairs show that the chosen techniques are effective in improving isolation between uplink and downlink antenna pair.","PeriodicalId":430600,"journal":{"name":"ICT 2013","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131367833","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}
Pub Date : 2013-05-06DOI: 10.1109/ICTEL.2013.6632097
Chien-Chun Cheng, S. Sezginer, H. Sari, Y. Su
A robust receiver for multiple-input multiple-output orthogonal frequency-division multiplexing (MIMO-OFDM) systems is proposed. We are interested in the scenario when only a limited number of pilot symbols in both time and frequency domains are available. For this scenario, perfect channel state information is impossible to obtain and the receiver suffers from channel estimation errors. To overcome this limitation, we apply two criterions to derive the optimal receiver in the sense: 1) maximum likelihood with the distribution of channel estimation and 2) jointly channel and data estimation. Simulation results are presented, showing that the proposed schemes outperform the conventional scheme under imperfect channel knowledge.
{"title":"Robust MIMO-OFDM detection with channel estimation errors","authors":"Chien-Chun Cheng, S. Sezginer, H. Sari, Y. Su","doi":"10.1109/ICTEL.2013.6632097","DOIUrl":"https://doi.org/10.1109/ICTEL.2013.6632097","url":null,"abstract":"A robust receiver for multiple-input multiple-output orthogonal frequency-division multiplexing (MIMO-OFDM) systems is proposed. We are interested in the scenario when only a limited number of pilot symbols in both time and frequency domains are available. For this scenario, perfect channel state information is impossible to obtain and the receiver suffers from channel estimation errors. To overcome this limitation, we apply two criterions to derive the optimal receiver in the sense: 1) maximum likelihood with the distribution of channel estimation and 2) jointly channel and data estimation. Simulation results are presented, showing that the proposed schemes outperform the conventional scheme under imperfect channel knowledge.","PeriodicalId":430600,"journal":{"name":"ICT 2013","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130746073","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}
Pub Date : 2013-05-06DOI: 10.1109/ICTEL.2013.6632130
Ming Liu, M. Crussiére, M. Hélard, J. Hélard
This paper studies the application of distributed multiple-input multiple-output (MIMO), i.e. MIMO transmission over several geographically separated but cooperated transmitters, for future TV broadcasting systems. It is first shown that distributed MIMO is promising for the future broadcasting systems from a channel capacity perspective. Several STBCs that can be applied in the distributed MIMO broadcasting scenarios are then discussed. Through performance comparison and complexity analyses with realistic system settings and channel model, it can be concluded that simple STBCs are efficient for low data rate applications, while the sophisticated ones are more suitable to deliver high data rate services.
{"title":"Distributed MIMO schemes for the future digital video broadcasting","authors":"Ming Liu, M. Crussiére, M. Hélard, J. Hélard","doi":"10.1109/ICTEL.2013.6632130","DOIUrl":"https://doi.org/10.1109/ICTEL.2013.6632130","url":null,"abstract":"This paper studies the application of distributed multiple-input multiple-output (MIMO), i.e. MIMO transmission over several geographically separated but cooperated transmitters, for future TV broadcasting systems. It is first shown that distributed MIMO is promising for the future broadcasting systems from a channel capacity perspective. Several STBCs that can be applied in the distributed MIMO broadcasting scenarios are then discussed. Through performance comparison and complexity analyses with realistic system settings and channel model, it can be concluded that simple STBCs are efficient for low data rate applications, while the sophisticated ones are more suitable to deliver high data rate services.","PeriodicalId":430600,"journal":{"name":"ICT 2013","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133996684","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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