Pub Date : 2013-05-06DOI: 10.1109/ICTEL.2013.6632066
Ke Wang, Chi Zhang, Lei Cao, Yongyu Chang, Dacheng Yang
Heterogeneous network (HetNet) has been studied earlier in the context of LTE. But lately, there are also some discussions about HetNet in HSPA. Cross-tier interference (CTI) is an annoying issue to be investigated in the co-channel HSPA HetNet (CHH) scenario. In this paper, we will focus on the downlink CTI problem in CHH and propose a solution to mitigate it. Our scheme involves the macro muting (MM) in which macro NodeB will mute itself at some certain sub-frames to reduce the CTI level in the system. We also enhance the MM scheme by introducing the adaptive CQI hysteresis (ACH) mechanism to avoid the issue that the low power node (LPN) in HetNet may use the improper CQI for transmitting when MM is implemented. Simulation results will show the benefits of our proposed scheme.
{"title":"Cross-tier interference coordination of macro muting based on adaptive CQI hysteresis in HSPA heterogeneous network","authors":"Ke Wang, Chi Zhang, Lei Cao, Yongyu Chang, Dacheng Yang","doi":"10.1109/ICTEL.2013.6632066","DOIUrl":"https://doi.org/10.1109/ICTEL.2013.6632066","url":null,"abstract":"Heterogeneous network (HetNet) has been studied earlier in the context of LTE. But lately, there are also some discussions about HetNet in HSPA. Cross-tier interference (CTI) is an annoying issue to be investigated in the co-channel HSPA HetNet (CHH) scenario. In this paper, we will focus on the downlink CTI problem in CHH and propose a solution to mitigate it. Our scheme involves the macro muting (MM) in which macro NodeB will mute itself at some certain sub-frames to reduce the CTI level in the system. We also enhance the MM scheme by introducing the adaptive CQI hysteresis (ACH) mechanism to avoid the issue that the low power node (LPN) in HetNet may use the improper CQI for transmitting when MM is implemented. Simulation results will show the benefits of our proposed scheme.","PeriodicalId":430600,"journal":{"name":"ICT 2013","volume":"79 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":"134312974","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.2013.6632072
M. Manna, Walid M. Qaja, J. Chambers
In this paper we present a modified quasiorthogonal space-time block coding (M QO-STBC) scheme with full diversity and code gain distance (CGD) for use in asynchronous relay networks. We implement an orthogonal frequency division multiplexing (OFDM) scheme with cyclic prefix (CP) at the source to mitigate the effects of random delays between the relay nodes and the destination caused by asynchronism. The modified code is structured by using a proper signal rotation and set partitioning of two quasi-orthogonal codebooks. Furthermore, the best two relays are selected from a set of M available relays based on the end-to-end instantaneous path gains. Simulation results show that the OFDM-based scheme can significantly enhance the performance of the system under imperfect synchronization. Simulations also shows that the relay selection improved the reliability of the link as compared to a conventional system.
{"title":"OFDM-based modified quasi-orthogonal space-time scheme for use in asynchronous cooperative networks with relay selection","authors":"M. Manna, Walid M. Qaja, J. Chambers","doi":"10.1109/ICTEL.2013.6632072","DOIUrl":"https://doi.org/10.1109/ICTEL.2013.6632072","url":null,"abstract":"In this paper we present a modified quasiorthogonal space-time block coding (M QO-STBC) scheme with full diversity and code gain distance (CGD) for use in asynchronous relay networks. We implement an orthogonal frequency division multiplexing (OFDM) scheme with cyclic prefix (CP) at the source to mitigate the effects of random delays between the relay nodes and the destination caused by asynchronism. The modified code is structured by using a proper signal rotation and set partitioning of two quasi-orthogonal codebooks. Furthermore, the best two relays are selected from a set of M available relays based on the end-to-end instantaneous path gains. Simulation results show that the OFDM-based scheme can significantly enhance the performance of the system under imperfect synchronization. Simulations also shows that the relay selection improved the reliability of the link as compared to a conventional system.","PeriodicalId":430600,"journal":{"name":"ICT 2013","volume":"30 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":"134334686","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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