Pub Date : 2013-05-06DOI: 10.1109/ICTEL.2013.6632137
Cong Wang, Yiwen Xu, Qixun Zhang, Z. Feng, Sisi Ma
Dynamic spectrum leasing is a new spectrum sharing paradigm to achieve efficient use of the frequency resources for cognitive radio. In this paper, we propose two schemes of selecting secondary nodes as relays. Secondary users act as relays to improve quality of service of primary user, then primary user may lease a fraction of spectrum bands to secondary users. It is shown that these two schemes can improve the performance of primary and secondary network significantly while maintaining a fixed target data rate for the primary user. Moreover, we derive the accurate expression of primary outage probability of using all the secondary nodes as relays. Simulation results are presented to evaluate and compare the performances of the proposed two schemes.
{"title":"Cognitive multi-relay based on dynamic spectrum leasing","authors":"Cong Wang, Yiwen Xu, Qixun Zhang, Z. Feng, Sisi Ma","doi":"10.1109/ICTEL.2013.6632137","DOIUrl":"https://doi.org/10.1109/ICTEL.2013.6632137","url":null,"abstract":"Dynamic spectrum leasing is a new spectrum sharing paradigm to achieve efficient use of the frequency resources for cognitive radio. In this paper, we propose two schemes of selecting secondary nodes as relays. Secondary users act as relays to improve quality of service of primary user, then primary user may lease a fraction of spectrum bands to secondary users. It is shown that these two schemes can improve the performance of primary and secondary network significantly while maintaining a fixed target data rate for the primary user. Moreover, we derive the accurate expression of primary outage probability of using all the secondary nodes as relays. Simulation results are presented to evaluate and compare the performances of the proposed two schemes.","PeriodicalId":430600,"journal":{"name":"ICT 2013","volume":"26 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":"127138312","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.2013.6632112
Said Jai-Andaloussi, Abdeljalil Elabdouli, Abdelmajid Chaffai, N. Madrane, A. Sekkaki
Most medical images are now digitized and stored in large image databases. Retrieving the desired images becomes a challenge. In this paper, we address the challenge of content based image retrieval system by applying the MapReduce distributed computing model and the HDFS storage model. Two methods are used to characterize the content of images: the first is called the BEMD-GGD method (Bidimensional Empirical Mode Decomposition with Generalized Gaussian density functions) and the second is called the BEMD-HHT method (Bidi-mensional Empirical Mode Decomposition with Huang-Hilbert Transform HHT). To measure similarity between images we compute the distance between signatures of images, for that we use the Kullback-Leibler Divergence (KLD) to compare the BEMD-GGD signatures and the Euclidean distance to compare the HHT signatures. Through the experiments on the DDSM mammography image database, we confirm that the results are promising and this work has allowed us to verify the feasibility and efficiency of applying the CBIR in the large medical image databases.
{"title":"Medical content based image retrieval by using the Hadoop framework","authors":"Said Jai-Andaloussi, Abdeljalil Elabdouli, Abdelmajid Chaffai, N. Madrane, A. Sekkaki","doi":"10.1109/ICTEL.2013.6632112","DOIUrl":"https://doi.org/10.1109/ICTEL.2013.6632112","url":null,"abstract":"Most medical images are now digitized and stored in large image databases. Retrieving the desired images becomes a challenge. In this paper, we address the challenge of content based image retrieval system by applying the MapReduce distributed computing model and the HDFS storage model. Two methods are used to characterize the content of images: the first is called the BEMD-GGD method (Bidimensional Empirical Mode Decomposition with Generalized Gaussian density functions) and the second is called the BEMD-HHT method (Bidi-mensional Empirical Mode Decomposition with Huang-Hilbert Transform HHT). To measure similarity between images we compute the distance between signatures of images, for that we use the Kullback-Leibler Divergence (KLD) to compare the BEMD-GGD signatures and the Euclidean distance to compare the HHT signatures. Through the experiments on the DDSM mammography image database, we confirm that the results are promising and this work has allowed us to verify the feasibility and efficiency of applying the CBIR in the large medical image databases.","PeriodicalId":430600,"journal":{"name":"ICT 2013","volume":"175 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":"127543566","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.2013.6632099
Ryma Abassi, S. Fatmi
MANET (Mobile Ad hoc NETwork) is a self organized network with nodes collaborating in order to communicate. Hence, availability of the resources in such network is fundamental. Availability concerns essentially the network nodes as well as routing and forwarding actions accessibility. Generally, nodes lifetime is consumed by legitimate traffic. It also can be shortened or even depleted by deny of service attacks penalizing the routing process. In this paper, we propose a novel scheme based on a delegation process and allowing the perpetuity of routes without neither stopping packets transfer nor novel route calculation. The purpose of this delegation is to allow a node with a short lifetime to be replaced by another one avoiding a novel route definition. Due to the criticality of the delegation task, it must be made within a secure environment i.e. between trustworthy nodes. Our proposal is then, a trust-based delegation scheme extending routing protocols. This scheme was designed in order to fit with MANET characteristics such as dynamicity, decentralization, etc and is based on three phases: initialization, negotiation and revocation.
{"title":"Dealing with delegation in a trust-based MANET","authors":"Ryma Abassi, S. Fatmi","doi":"10.1109/ICTEL.2013.6632099","DOIUrl":"https://doi.org/10.1109/ICTEL.2013.6632099","url":null,"abstract":"MANET (Mobile Ad hoc NETwork) is a self organized network with nodes collaborating in order to communicate. Hence, availability of the resources in such network is fundamental. Availability concerns essentially the network nodes as well as routing and forwarding actions accessibility. Generally, nodes lifetime is consumed by legitimate traffic. It also can be shortened or even depleted by deny of service attacks penalizing the routing process. In this paper, we propose a novel scheme based on a delegation process and allowing the perpetuity of routes without neither stopping packets transfer nor novel route calculation. The purpose of this delegation is to allow a node with a short lifetime to be replaced by another one avoiding a novel route definition. Due to the criticality of the delegation task, it must be made within a secure environment i.e. between trustworthy nodes. Our proposal is then, a trust-based delegation scheme extending routing protocols. This scheme was designed in order to fit with MANET characteristics such as dynamicity, decentralization, etc and is based on three phases: initialization, negotiation and revocation.","PeriodicalId":430600,"journal":{"name":"ICT 2013","volume":"2 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":"127829161","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.2013.6632092
S. Bourbia, Daniel Le Guennec, K. Grati, A. Ghazel
This paper concerns a scenario of decision making that adapts the receiver to its radio environment in order to reduce its computational complexity. It consists of providing the receiver equipment with cognitive capacities of being aware of its environment and able to decide to perform a beamforming action or not, depending on whether this action is necessary to ameliorate the SNR or not. The fact of limiting the use of this action should reduce the computational complexity caused by the operation of orienting the antenna elements' main lobe.
{"title":"Reducing the receiver's computation complexity by limiting the use of the beamforming action","authors":"S. Bourbia, Daniel Le Guennec, K. Grati, A. Ghazel","doi":"10.1109/ICTEL.2013.6632092","DOIUrl":"https://doi.org/10.1109/ICTEL.2013.6632092","url":null,"abstract":"This paper concerns a scenario of decision making that adapts the receiver to its radio environment in order to reduce its computational complexity. It consists of providing the receiver equipment with cognitive capacities of being aware of its environment and able to decide to perform a beamforming action or not, depending on whether this action is necessary to ameliorate the SNR or not. The fact of limiting the use of this action should reduce the computational complexity caused by the operation of orienting the antenna elements' main lobe.","PeriodicalId":430600,"journal":{"name":"ICT 2013","volume":"40 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":"121238652","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}
Femtocells have attracted growing attentions in academia, industry, and standardization forums in recent years. In this paper, we investigate a distributed radio resource allocation scheme to maximize the energy-efficiency in uplink OFDMA dense femtocell networks. We model the subchannel allocation and power control problem as a non-cooperation game. Due to the fact that joint subchannel allocation and power control problem is NP-hard, for decreasing the complexity, we decompose the resource allocation problem into two subproblems. A distributed subchannel allocation algorithm and an optimal power allocation algorithm are proposed to resolve the resource allocation problem. Simulation results show the proposed algorithm has better performance in terms of throughput and energy-efficiency.
{"title":"Energy-efficient resource optimization in OFDMA-based dense femtocell networks","authors":"Zhicai Zhang, Haijun Zhang, Zhaoming Lu, Zhenmin Zhao, X. Wen","doi":"10.1109/ICTEL.2013.6632088","DOIUrl":"https://doi.org/10.1109/ICTEL.2013.6632088","url":null,"abstract":"Femtocells have attracted growing attentions in academia, industry, and standardization forums in recent years. In this paper, we investigate a distributed radio resource allocation scheme to maximize the energy-efficiency in uplink OFDMA dense femtocell networks. We model the subchannel allocation and power control problem as a non-cooperation game. Due to the fact that joint subchannel allocation and power control problem is NP-hard, for decreasing the complexity, we decompose the resource allocation problem into two subproblems. A distributed subchannel allocation algorithm and an optimal power allocation algorithm are proposed to resolve the resource allocation problem. Simulation results show the proposed algorithm has better performance in terms of throughput and energy-efficiency.","PeriodicalId":430600,"journal":{"name":"ICT 2013","volume":"56 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":"123627877","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.2013.6632073
R. Razavi, H. Claussen
In this paper, a novel scheme to improve learning mechanism for future self-organising networks' functionalities is presented using a combination of fuzzy logic and reinforcement learning. Although the two frameworks compliment each other well, an efficient reward distribution mechanism needs to be deployed or otherwise the learning performance may be degraded. This study introduces an improved reward distribution (IRD) scheme in that the action space is abstracted to represent only the actions that are most relevant to the final crisp executed action after defuzzification. As a case study, coverage and capacity optimisation of heterogeneous networks consisting of dense deployment of small cells is considered. Using the proposed method, simulation results confirm considerable performance enhancment in terms of learning efficiency and convergence time.
{"title":"Improved fuzzy reinforcement learning for self-optimisation of heterogeneous wireless networks","authors":"R. Razavi, H. Claussen","doi":"10.1109/ICTEL.2013.6632073","DOIUrl":"https://doi.org/10.1109/ICTEL.2013.6632073","url":null,"abstract":"In this paper, a novel scheme to improve learning mechanism for future self-organising networks' functionalities is presented using a combination of fuzzy logic and reinforcement learning. Although the two frameworks compliment each other well, an efficient reward distribution mechanism needs to be deployed or otherwise the learning performance may be degraded. This study introduces an improved reward distribution (IRD) scheme in that the action space is abstracted to represent only the actions that are most relevant to the final crisp executed action after defuzzification. As a case study, coverage and capacity optimisation of heterogeneous networks consisting of dense deployment of small cells is considered. Using the proposed method, simulation results confirm considerable performance enhancment in terms of learning efficiency and convergence time.","PeriodicalId":430600,"journal":{"name":"ICT 2013","volume":"94 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":"122722997","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.2013.6632117
T. Xu, R. Grammenos, I. Darwazeh
A new method for detecting Spectrally Efficient Frequency Division Multiplexing (SEFDM) is proposed and verified through modelling and practical FPGA implementation. The method is derived through studies of two sphere decoding techniques, namely Fixed SD (FSD) with Sort-Free (SF) and Non-Sort-Free (NSF) algorithms. We report a co-simulation verification framework to verify the performance of these detectors and to choose an optimum design. Finally, a hybrid detector Truncated Singular Value Decomposition-Fixed Sphere Detector (TSVD-FSD) is tested on the FPGA platform. Error behaviour is studied for the practical FPGA system and then compared with theoretical/ideal modelling. Detailed analysis indicates the suitability of our design and implementation methods for SEFDM detection with 16 carriers and 25% bandwidth saving.
{"title":"FPGA implementations of real-time detectors for a spectrally efficient FDM system","authors":"T. Xu, R. Grammenos, I. Darwazeh","doi":"10.1109/ICTEL.2013.6632117","DOIUrl":"https://doi.org/10.1109/ICTEL.2013.6632117","url":null,"abstract":"A new method for detecting Spectrally Efficient Frequency Division Multiplexing (SEFDM) is proposed and verified through modelling and practical FPGA implementation. The method is derived through studies of two sphere decoding techniques, namely Fixed SD (FSD) with Sort-Free (SF) and Non-Sort-Free (NSF) algorithms. We report a co-simulation verification framework to verify the performance of these detectors and to choose an optimum design. Finally, a hybrid detector Truncated Singular Value Decomposition-Fixed Sphere Detector (TSVD-FSD) is tested on the FPGA platform. Error behaviour is studied for the practical FPGA system and then compared with theoretical/ideal modelling. Detailed analysis indicates the suitability of our design and implementation methods for SEFDM detection with 16 carriers and 25% bandwidth saving.","PeriodicalId":430600,"journal":{"name":"ICT 2013","volume":"91 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":"126267915","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.2013.6632089
M. Diallo, M. Hélard, L. Cariou
In this paper we propose an efficient way to transmit accurate channel estimation to the transmitter when this latter requires them in order to calculate its precoding vectors. Since number of channel coefficients that need to be sent back to the transmitter, especially when the number of transmit and receive antennas as well as the number of subcarriers of OFDM systems increase, studies on limited channel state information (CSI) feedback are worth being carried out. A limited feedback scheme that allows both the accuracy of the feedback to be improved and the feedback amount to be reduced, based on the sending back of the channel impulse response called temporal CSI (TCSI) is proposed. The proposed scheme is straightfully applied to a IEEE802.11n system.
{"title":"A limited and efficient quantized feedback for IEEE 802.11n evolution","authors":"M. Diallo, M. Hélard, L. Cariou","doi":"10.1109/ICTEL.2013.6632089","DOIUrl":"https://doi.org/10.1109/ICTEL.2013.6632089","url":null,"abstract":"In this paper we propose an efficient way to transmit accurate channel estimation to the transmitter when this latter requires them in order to calculate its precoding vectors. Since number of channel coefficients that need to be sent back to the transmitter, especially when the number of transmit and receive antennas as well as the number of subcarriers of OFDM systems increase, studies on limited channel state information (CSI) feedback are worth being carried out. A limited feedback scheme that allows both the accuracy of the feedback to be improved and the feedback amount to be reduced, based on the sending back of the channel impulse response called temporal CSI (TCSI) is proposed. The proposed scheme is straightfully applied to a IEEE802.11n system.","PeriodicalId":430600,"journal":{"name":"ICT 2013","volume":"17 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":"126474301","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.2013.6632119
Hui Ji, G. Zaharia, J. Hélard
In this paper, a new differential space-time modulation (DSTM) scheme for 4×4 multiple input multiple output (MIMO) systems is proposed. This scheme is used for MIMO systems where the channel coefficients are not available at both the transmitter and the receiver. The transmission matrices used in this scheme belong to the Weyl group. Simulation results show that this new scheme with four transmit antennas outperforms the well-known Tarokh's differential space-time block coding (DSTBC) scheme. The spectral efficiency of this scheme can be up to 3 bit/s/Hz.
{"title":"A new differential space-time modulation scheme for MIMO systems with four transmit antennas","authors":"Hui Ji, G. Zaharia, J. Hélard","doi":"10.1109/ICTEL.2013.6632119","DOIUrl":"https://doi.org/10.1109/ICTEL.2013.6632119","url":null,"abstract":"In this paper, a new differential space-time modulation (DSTM) scheme for 4×4 multiple input multiple output (MIMO) systems is proposed. This scheme is used for MIMO systems where the channel coefficients are not available at both the transmitter and the receiver. The transmission matrices used in this scheme belong to the Weyl group. Simulation results show that this new scheme with four transmit antennas outperforms the well-known Tarokh's differential space-time block coding (DSTBC) scheme. The spectral efficiency of this scheme can be up to 3 bit/s/Hz.","PeriodicalId":430600,"journal":{"name":"ICT 2013","volume":"271 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":"123111340","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.2013.6632067
M. Lahby, L. Cherkaoui, A. Adib
The concept “Always Best connected“ (ABC) is one of the main challenges in heterogeneous wireless networks. Based on the functionality of ABC, the users can be always connected to different services anywhere at anytime with multi-interfaces devices. The vertical handover decision is an efficient solution that can used to ensure the ABC paradigm. Thisenhanced vertical handover decision technique paper proposes an enhanced vertical handover decision technique which combines two multi attribute decision making (MADM) methods, the analytic network process (ANP) and the enhanced technique for order preference by similarity to an ideal solution (E-TOPSIS). The ANP method is applied to weigh the criteria and the E-TOPSIS method is used to rank the alternatives. The simulation results show that the proposed technique can effectively reduce the reversal phenomenon and the number of handoffs.
{"title":"An enhanced-TOPSIS based network selection technique for next generation wireless networks","authors":"M. Lahby, L. Cherkaoui, A. Adib","doi":"10.1109/ICTEL.2013.6632067","DOIUrl":"https://doi.org/10.1109/ICTEL.2013.6632067","url":null,"abstract":"The concept “Always Best connected“ (ABC) is one of the main challenges in heterogeneous wireless networks. Based on the functionality of ABC, the users can be always connected to different services anywhere at anytime with multi-interfaces devices. The vertical handover decision is an efficient solution that can used to ensure the ABC paradigm. Thisenhanced vertical handover decision technique paper proposes an enhanced vertical handover decision technique which combines two multi attribute decision making (MADM) methods, the analytic network process (ANP) and the enhanced technique for order preference by similarity to an ideal solution (E-TOPSIS). The ANP method is applied to weigh the criteria and the E-TOPSIS method is used to rank the alternatives. The simulation results show that the proposed technique can effectively reduce the reversal phenomenon and the number of handoffs.","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":"134476416","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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