Pub Date : 2011-05-08DOI: 10.1109/CTS.2011.5898977
Shoufeng Wang, Weidong Wang, Fan Li, Yinghai Zhang
Spectrum handover becomes one of the hot topics of Cognitive Radio recently. Spectrum handover happens when the primary users and secondary users collide on the same spectrum hole, and the secondary users need to switch to other spectrum holes to continue the communication. Therefore, the reliability of spectrum Q-learning handover, which is reflected by the quality of service of secondary users and the reduction of interference of primary users, needs deeper research. This paper proposes the scheme of Anticipated Spectrum Handover Scheme (ASHS), which models the primary channel with the consideration of the activity of secondary users based on renewal theory. Secondary users would anticipate the trigger of spectrum handover and select proper spectrum hole as the target one according to the anticipation. The simulation results show that the drop ratio of secondary users is decreased and the frequency of spectrum handovers and passive handovers are decreased.
{"title":"Anticipated spectrum handover in cognitive radios","authors":"Shoufeng Wang, Weidong Wang, Fan Li, Yinghai Zhang","doi":"10.1109/CTS.2011.5898977","DOIUrl":"https://doi.org/10.1109/CTS.2011.5898977","url":null,"abstract":"Spectrum handover becomes one of the hot topics of Cognitive Radio recently. Spectrum handover happens when the primary users and secondary users collide on the same spectrum hole, and the secondary users need to switch to other spectrum holes to continue the communication. Therefore, the reliability of spectrum Q-learning handover, which is reflected by the quality of service of secondary users and the reduction of interference of primary users, needs deeper research. This paper proposes the scheme of Anticipated Spectrum Handover Scheme (ASHS), which models the primary channel with the consideration of the activity of secondary users based on renewal theory. Secondary users would anticipate the trigger of spectrum handover and select proper spectrum hole as the target one according to the anticipation. The simulation results show that the drop ratio of secondary users is decreased and the frequency of spectrum handovers and passive handovers are decreased.","PeriodicalId":142306,"journal":{"name":"2011 18th International Conference on Telecommunications","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131642082","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 : 2011-05-08DOI: 10.1109/CTS.2011.5898940
Hui Gao, Xin Su, Tiejun Lv
A novel spatial diversity scheme is proposed for physical-layer network coding (PNC) aided two-way relay network with a multiple-antenna relay node. Distinct from the traditional virtual-MIMO based MIMO-NC/PNC schemes, a novel PNC-specific maximal-ratio-combining like (MRC-L) scheme is designed to achieve receive diversity in the multiple-access (MA) phase, and the space-time coding (STC) is adopted to achieve transmit diversity in the broadcast (BC) phase. Both analysis and simulation results prove that the proposed scheme achieves an end-to-end diversity gain and greatly outperforms the virtual-MIMO based MIMO-NC/PNC schemes and the SISO-PNC scheme in fading channel.
{"title":"Combined MRC-like reception and transmit diversity for physical-layer network coding with multiple-antenna relay","authors":"Hui Gao, Xin Su, Tiejun Lv","doi":"10.1109/CTS.2011.5898940","DOIUrl":"https://doi.org/10.1109/CTS.2011.5898940","url":null,"abstract":"A novel spatial diversity scheme is proposed for physical-layer network coding (PNC) aided two-way relay network with a multiple-antenna relay node. Distinct from the traditional virtual-MIMO based MIMO-NC/PNC schemes, a novel PNC-specific maximal-ratio-combining like (MRC-L) scheme is designed to achieve receive diversity in the multiple-access (MA) phase, and the space-time coding (STC) is adopted to achieve transmit diversity in the broadcast (BC) phase. Both analysis and simulation results prove that the proposed scheme achieves an end-to-end diversity gain and greatly outperforms the virtual-MIMO based MIMO-NC/PNC schemes and the SISO-PNC scheme in fading channel.","PeriodicalId":142306,"journal":{"name":"2011 18th International Conference on Telecommunications","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132020617","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 : 2011-05-08DOI: 10.1109/CTS.2011.5898989
M. H. L. Froushani, B. Khalaj, Shahin Vakilinia
Cooperation is an integral part of wireless ad hoc networks. In this paper, we introduce a combination of pricing and reputation-based mechanisms targeted at generating higher incentive for cooperation among nodes. The reputation-based part of the mechanism guarantees proper cooperation among sources. In addition, the pricing-based mechanism is added to ensure cooperation of relay nodes. In contrast with earlier works, a more comprehensive definition of cooperation is presented which guarantees a better reward and punishment system. In our approach, a multi-player game is defined with continuous strategy set and payoffs which lead to a more practical model. Based on the proposed game theoretic framework, existence of Nash equilibrium is then investigated. Finally, simulation results evaluate performance of the proposed scheme.
{"title":"A novel approach to incentive-based cooperation in wireless ad hoc networks","authors":"M. H. L. Froushani, B. Khalaj, Shahin Vakilinia","doi":"10.1109/CTS.2011.5898989","DOIUrl":"https://doi.org/10.1109/CTS.2011.5898989","url":null,"abstract":"Cooperation is an integral part of wireless ad hoc networks. In this paper, we introduce a combination of pricing and reputation-based mechanisms targeted at generating higher incentive for cooperation among nodes. The reputation-based part of the mechanism guarantees proper cooperation among sources. In addition, the pricing-based mechanism is added to ensure cooperation of relay nodes. In contrast with earlier works, a more comprehensive definition of cooperation is presented which guarantees a better reward and punishment system. In our approach, a multi-player game is defined with continuous strategy set and payoffs which lead to a more practical model. Based on the proposed game theoretic framework, existence of Nash equilibrium is then investigated. Finally, simulation results evaluate performance of the proposed scheme.","PeriodicalId":142306,"journal":{"name":"2011 18th International Conference on Telecommunications","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130198853","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 : 2011-05-08DOI: 10.1109/CTS.2011.5898952
M. Perrett, I. Darwazeh
Field Programmable Gate Arrays (FPGA) offer a unique combination of software abstraction and hardware performance, enabled by programming languages such as VHDL or Verilog. Inherent from this capability is a multitude of different design possibilities for a single implementation problem. A system can be designed which allows for real world evaluation at real time speeds of algorithms ordinarily restricted to simulation environments. Presented here is an FPGA implementation of a method of generating non-orthogonal Frequency Division Multiplexed signals, where the spacing between sub-carriers can be controlled externally without the need for re-synthesis. The internal data-paths and associated algorithms are constructed so as to react to changes which dictate the aforementioned spacing, and as such represents a dynamic transmission platform for research purposes.
{"title":"Flexible hardware architecture of SEFDM transmitters with real-time non-orthogonal adjustment","authors":"M. Perrett, I. Darwazeh","doi":"10.1109/CTS.2011.5898952","DOIUrl":"https://doi.org/10.1109/CTS.2011.5898952","url":null,"abstract":"Field Programmable Gate Arrays (FPGA) offer a unique combination of software abstraction and hardware performance, enabled by programming languages such as VHDL or Verilog. Inherent from this capability is a multitude of different design possibilities for a single implementation problem. A system can be designed which allows for real world evaluation at real time speeds of algorithms ordinarily restricted to simulation environments. Presented here is an FPGA implementation of a method of generating non-orthogonal Frequency Division Multiplexed signals, where the spacing between sub-carriers can be controlled externally without the need for re-synthesis. The internal data-paths and associated algorithms are constructed so as to react to changes which dictate the aforementioned spacing, and as such represents a dynamic transmission platform for research purposes.","PeriodicalId":142306,"journal":{"name":"2011 18th International Conference on Telecommunications","volume":"12 4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130483927","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 : 2011-05-08DOI: 10.1109/CTS.2011.5898969
Jiang Zhang, Rong Fu, Hao Yu, S. Ruepp, M. Berger, L. Dittmann
This paper investigates and compares the schemes suggested by the ITU and the IETF for MPLS-TP ring protection, and proposes two MPLS-TP ring protections to ensure reliability of MPLS-TP multicast services. The introduced ring protection schemes are named, the SPME-based-Wrapping protection scheme and the SPME-based-ROM-Wrapping protection scheme, both of which aim at retaining the advantages of previous MPSL-TP ring protections and avoiding limitations. In the paper, the requirements of designing an efficient and reliable MPLS-TP ring protection, for instance with respect to label consumption, bandwidth utilization and operation complexity are well considered and also set concrete evaluating criteria for new proposed MPLS-TP ring protection schemes for multicast services.
对ITU和IETF提出的MPLS-TP环保护方案进行了研究和比较，提出了两种保证MPLS-TP组播业务可靠性的MPLS-TP环保护方案。引入的环保护方案被命名为spme -based- wrapped保护方案和spme -based- rom - wrapped保护方案，这两种方案都旨在保留以前的mpls - tp环保护的优点并避免局限性。本文充分考虑了设计高效可靠的MPLS-TP环保护在标签消耗、带宽利用率和操作复杂度等方面的要求，并对新的多播MPLS-TP环保护方案提出了具体的评价标准。
{"title":"Two novel tunnel-based ring protection switching for MPLS-TP multicast services","authors":"Jiang Zhang, Rong Fu, Hao Yu, S. Ruepp, M. Berger, L. Dittmann","doi":"10.1109/CTS.2011.5898969","DOIUrl":"https://doi.org/10.1109/CTS.2011.5898969","url":null,"abstract":"This paper investigates and compares the schemes suggested by the ITU and the IETF for MPLS-TP ring protection, and proposes two MPLS-TP ring protections to ensure reliability of MPLS-TP multicast services. The introduced ring protection schemes are named, the SPME-based-Wrapping protection scheme and the SPME-based-ROM-Wrapping protection scheme, both of which aim at retaining the advantages of previous MPSL-TP ring protections and avoiding limitations. In the paper, the requirements of designing an efficient and reliable MPLS-TP ring protection, for instance with respect to label consumption, bandwidth utilization and operation complexity are well considered and also set concrete evaluating criteria for new proposed MPLS-TP ring protection schemes for multicast services.","PeriodicalId":142306,"journal":{"name":"2011 18th International Conference on Telecommunications","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133898893","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 : 2011-05-08DOI: 10.1109/CTS.2011.5898946
Sayed A. Hadei, P. Azmi
In this paper, we propose novel low-complexity adaptive channel estimation techniques for mobile wireless channels in presence of Rayleigh fading, carrier frequency offsets (CFO) and random channel variations. We show that the selective partial update of the estimated channel tap-weight vector offers a better trade-off between the performance and computational complexity, compared to the full update of the estimated channel tap-weight vector. We evaluate the mean-square weight error of the proposed methods and demonstrate the usefulness of its via simulation studies.
{"title":"Low-complexity adaptive channel estimation over multipath Rayleigh fading non-stationary channels under CFO","authors":"Sayed A. Hadei, P. Azmi","doi":"10.1109/CTS.2011.5898946","DOIUrl":"https://doi.org/10.1109/CTS.2011.5898946","url":null,"abstract":"In this paper, we propose novel low-complexity adaptive channel estimation techniques for mobile wireless channels in presence of Rayleigh fading, carrier frequency offsets (CFO) and random channel variations. We show that the selective partial update of the estimated channel tap-weight vector offers a better trade-off between the performance and computational complexity, compared to the full update of the estimated channel tap-weight vector. We evaluate the mean-square weight error of the proposed methods and demonstrate the usefulness of its via simulation studies.","PeriodicalId":142306,"journal":{"name":"2011 18th International Conference on Telecommunications","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132476563","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 : 2011-05-08DOI: 10.1109/CTS.2011.5898906
Yongliang Zhang, Yongyu Chang, Liyun Dai, Dacheng Yang
In this paper, we propose a simplified amplify-and-forward (AF) relaying scheme with adaptive modulation to maximize the spectral efficiency. We derive the closed-form expressions of the average spectral efficiency and outage probability of the proposed scheme over Rayleigh fading channels. The analysis results are verified by using Monte Carlo simulation. The numerical results demonstrate that the proposed scheme not only has simplified receiver architecture, but also can offer similarly high spectral efficiency as the MSE-AM scheme proposed in [1], when the relay link is stronger enough than the direct link.
{"title":"Performance of a simplified amplify-and-forward relaying with adaptive modulation over Rayleigh-fading channels","authors":"Yongliang Zhang, Yongyu Chang, Liyun Dai, Dacheng Yang","doi":"10.1109/CTS.2011.5898906","DOIUrl":"https://doi.org/10.1109/CTS.2011.5898906","url":null,"abstract":"In this paper, we propose a simplified amplify-and-forward (AF) relaying scheme with adaptive modulation to maximize the spectral efficiency. We derive the closed-form expressions of the average spectral efficiency and outage probability of the proposed scheme over Rayleigh fading channels. The analysis results are verified by using Monte Carlo simulation. The numerical results demonstrate that the proposed scheme not only has simplified receiver architecture, but also can offer similarly high spectral efficiency as the MSE-AM scheme proposed in [1], when the relay link is stronger enough than the direct link.","PeriodicalId":142306,"journal":{"name":"2011 18th International Conference on Telecommunications","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129986803","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 : 2011-05-08DOI: 10.1109/CTS.2011.5898949
N. Noels, M. Moeneclaey, F. Simoens, D. Delaruelle
This paper considers iterative detection of bit-interleaved coded continuous phase modulation in the presence of both phase noise (PN) and additive white Gaussian noise (AWGN). The proposed receiver iterates between a detection module and an estimation module. The detection module operates according to the sum-product algorithm and the factor graph framework in order to perform coherent maximum a posteriori bit detection in AWGN, using a PN estimate provided by the estimation module. The latter module, which results from the expectation-maximization algorithm for maximum likelihood estimation of the unknown PN samples, is implemented as a smoothing phase-locked loop that uses soft decisions provided by the detector. The full decoupling between the detection and the estimation processes allows the use of an off-the-shelf (coherent) bit detector. The technique is further characterized by a very low computational complexity, a small error performance degradation and a small number of overhead symbols.
{"title":"Iterative receiver with reduced implementation complexity for phase noise affected BIC-CPM","authors":"N. Noels, M. Moeneclaey, F. Simoens, D. Delaruelle","doi":"10.1109/CTS.2011.5898949","DOIUrl":"https://doi.org/10.1109/CTS.2011.5898949","url":null,"abstract":"This paper considers iterative detection of bit-interleaved coded continuous phase modulation in the presence of both phase noise (PN) and additive white Gaussian noise (AWGN). The proposed receiver iterates between a detection module and an estimation module. The detection module operates according to the sum-product algorithm and the factor graph framework in order to perform coherent maximum a posteriori bit detection in AWGN, using a PN estimate provided by the estimation module. The latter module, which results from the expectation-maximization algorithm for maximum likelihood estimation of the unknown PN samples, is implemented as a smoothing phase-locked loop that uses soft decisions provided by the detector. The full decoupling between the detection and the estimation processes allows the use of an off-the-shelf (coherent) bit detector. The technique is further characterized by a very low computational complexity, a small error performance degradation and a small number of overhead symbols.","PeriodicalId":142306,"journal":{"name":"2011 18th International Conference on Telecommunications","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134142950","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 : 2011-05-08DOI: 10.1109/CTS.2011.5898904
P. Heracleous, H. Ishiguro, N. Hagita
The access to communication technologies has become essential for the handicapped people. This study introduces the initial step of an automatic translation system able to translate visual speech used by deaf individuals to text, or auditory speech. A such a system would enable deaf users to communicate with each other and with normal-hearing people through telephone networks or through Internet by only using telephone devices equipped with simple cameras. In particular, this paper introduces automatic recognition and conversion to text of Cued Speech for French. Cued speech is a visual mode used for communication in the deaf society. Using hand shapes placed in different positions near the face as a complement to lipreading, all the sounds of a spoken language can be visually distinguished and perceived. Experimental results show high recognition rates for both isolated word and continuous phoneme recognition experiments in Cued Speech for French.
{"title":"Visual-speech to text conversion applicable to telephone communication for deaf individuals","authors":"P. Heracleous, H. Ishiguro, N. Hagita","doi":"10.1109/CTS.2011.5898904","DOIUrl":"https://doi.org/10.1109/CTS.2011.5898904","url":null,"abstract":"The access to communication technologies has become essential for the handicapped people. This study introduces the initial step of an automatic translation system able to translate visual speech used by deaf individuals to text, or auditory speech. A such a system would enable deaf users to communicate with each other and with normal-hearing people through telephone networks or through Internet by only using telephone devices equipped with simple cameras. In particular, this paper introduces automatic recognition and conversion to text of Cued Speech for French. Cued speech is a visual mode used for communication in the deaf society. Using hand shapes placed in different positions near the face as a complement to lipreading, all the sounds of a spoken language can be visually distinguished and perceived. Experimental results show high recognition rates for both isolated word and continuous phoneme recognition experiments in Cued Speech for French.","PeriodicalId":142306,"journal":{"name":"2011 18th International Conference on Telecommunications","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125310883","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 : 2011-05-08DOI: 10.1109/CTS.2011.5898932
I. Repo, Petri Eskelinen, Kari Aho, Frans Laakso
3GPP is investigating uplink transmit diversity alternatives for HSUPA. This paper focuses on a transmit diversity scheme using switching between two transmit antennas without additional feedback information. The special focus of this paper is on various non-ideal conditions that occur in real implementations, such as antenna imbalance, correlation and the existence of multiple different SATD algorithms in the network simultaneously. The studies show that transmit antenna correlation somewhat decreases performance but still keeps gains over the baseline, antenna imbalance reduces situations where the switching is feasible and that using a mixture of algorithms can bring down the gains.
{"title":"Switched antenna transmit diversity imperfections and their implications to HSUPA performance","authors":"I. Repo, Petri Eskelinen, Kari Aho, Frans Laakso","doi":"10.1109/CTS.2011.5898932","DOIUrl":"https://doi.org/10.1109/CTS.2011.5898932","url":null,"abstract":"3GPP is investigating uplink transmit diversity alternatives for HSUPA. This paper focuses on a transmit diversity scheme using switching between two transmit antennas without additional feedback information. The special focus of this paper is on various non-ideal conditions that occur in real implementations, such as antenna imbalance, correlation and the existence of multiple different SATD algorithms in the network simultaneously. The studies show that transmit antenna correlation somewhat decreases performance but still keeps gains over the baseline, antenna imbalance reduces situations where the switching is feasible and that using a mixture of algorithms can bring down the gains.","PeriodicalId":142306,"journal":{"name":"2011 18th International Conference on Telecommunications","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130109085","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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