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2011 18th International Conference on Telecommunications最新文献

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Performance of a simplified amplify-and-forward relaying with adaptive modulation over Rayleigh-fading channels 瑞利衰落信道上自适应调制的简化放大转发中继的性能
2011 18th International Conference on Telecommunications Pub Date : 2011-05-08 DOI: 10.1109/CTS.2011.5898906
Yongliang Zhang, Yongyu Chang, Liyun Dai, Dacheng Yang
{"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}
引用次数: 0
A novel approach to incentive-based cooperation in wireless ad hoc networks 无线自组织网络中基于激励的合作新方法
2011 18th International Conference on Telecommunications Pub Date : 2011-05-08 DOI: 10.1109/CTS.2011.5898989
M. H. L. Froushani, B. Khalaj, Shahin Vakilinia
{"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}
引用次数: 8
Combined MRC-like reception and transmit diversity for physical-layer network coding with multiple-antenna relay 结合多天线中继的物理层网络编码的类mrc接收和发送分集
2011 18th International Conference on Telecommunications Pub Date : 2011-05-08 DOI: 10.1109/CTS.2011.5898940
Hui Gao, Xin Su, Tiejun Lv
{"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}
引用次数: 13
Low-complexity adaptive channel estimation over multipath Rayleigh fading non-stationary channels under CFO CFO下多径瑞利衰落非平稳信道的低复杂度自适应信道估计
2011 18th International Conference on Telecommunications Pub Date : 2011-05-08 DOI: 10.1109/CTS.2011.5898946
Sayed A. Hadei, P. Azmi
{"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}
引用次数: 2
Two novel tunnel-based ring protection switching for MPLS-TP multicast services 基于隧道的两种新型MPLS-TP组播环保护交换
2011 18th International Conference on Telecommunications Pub Date : 2011-05-08 DOI: 10.1109/CTS.2011.5898969
Jiang Zhang, Rong Fu, Hao Yu, S. Ruepp, M. Berger, L. Dittmann
{"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}
引用次数: 1
Iterative receiver with reduced implementation complexity for phase noise affected BIC-CPM 降低相位噪声影响BIC-CPM实现复杂度的迭代接收机
2011 18th International Conference on Telecommunications Pub Date : 2011-05-08 DOI: 10.1109/CTS.2011.5898949
N. Noels, M. Moeneclaey, F. Simoens, D. Delaruelle
{"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}
引用次数: 1
Anticipated spectrum handover in cognitive radios 认知无线电中预期的频谱切换
2011 18th International Conference on Telecommunications Pub Date : 2011-05-08 DOI: 10.1109/CTS.2011.5898977
Shoufeng Wang, Weidong Wang, Fan Li, Yinghai Zhang
{"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}
引用次数: 8
Source localization through adaptive signal attenuation model and time delay estimation 通过自适应信号衰减模型和时延估计实现源定位
2011 18th International Conference on Telecommunications Pub Date : 2011-05-08 DOI: 10.1109/CTS.2011.5898908
Hamidreza Aghasi, M. Hashemi, B. Khalaj
{"title":"Source localization through adaptive signal attenuation model and time delay estimation","authors":"Hamidreza Aghasi, M. Hashemi, B. Khalaj","doi":"10.1109/CTS.2011.5898908","DOIUrl":"https://doi.org/10.1109/CTS.2011.5898908","url":null,"abstract":"In this paper we present a method of localizing multiple wideband acoustic sources based on both signal attenuation pattern and delays in the reception of the signal. Moreover, an additional order of flexibility is added to the problem by considering the attenuation model as an unknown function with reasonable prior assumptions about its functional space. Such approach is capable of enhancing the localization performance compared to when only the signal attenuation data or the time delays are used. A cost function is then formed in terms of the sources locations and the attenuation model parameters. Having different types of unknowns in the cost function, convergence concerns, and the advantage of using trust region methods encourages using the Levenberg-Marquardt algorithm. Accordingly, to simplify the implementation of the proposed algorithm, methods of calculating the Jacobian are provided. Finally the validity of the proposed method is verified by providing simulation results.","PeriodicalId":142306,"journal":{"name":"2011 18th International Conference on Telecommunications","volume":"119 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":"116317223","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Visual-speech to text conversion applicable to telephone communication for deaf individuals 适用于聋人电话交流的视语文字转换
2011 18th International Conference on Telecommunications Pub Date : 2011-05-08 DOI: 10.1109/CTS.2011.5898904
P. Heracleous, H. Ishiguro, N. Hagita
{"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}
引用次数: 16
Switched antenna transmit diversity imperfections and their implications to HSUPA performance 交换天线发射分集缺陷及其对HSUPA性能的影响
2011 18th International Conference on Telecommunications Pub Date : 2011-05-08 DOI: 10.1109/CTS.2011.5898932
I. Repo, Petri Eskelinen, Kari Aho, Frans Laakso
{"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}
引用次数: 2
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