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2011 18th International Conference on Telecommunications最新文献

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A novel detection strategy based on ant colony optimization for MIMO systems 一种新的基于蚁群优化的MIMO系统检测策略
2011 18th International Conference on Telecommunications Pub Date : 2011-05-08 DOI: 10.1109/CTS.2011.5898987
Ruohan Cao, Tiejun Lv, Hui Gao, Pengfei Chang
{"title":"A novel detection strategy based on ant colony optimization for MIMO systems","authors":"Ruohan Cao, Tiejun Lv, Hui Gao, Pengfei Chang","doi":"10.1109/CTS.2011.5898987","DOIUrl":"https://doi.org/10.1109/CTS.2011.5898987","url":null,"abstract":"This paper proposes two detection schemes based on a novel strategy associated with ant colony optimization (ACO) for multiple-input multiple-output (MIMO) systems. By employing heuristic values and pheromone levels, we jointly exploit local and global information about solution space to constitute transition probability. The proposed constitution rule evaluates the reliability of possible solution more efficiently than previous research. Besides, the unreliable solutions in terms of pheromone levels are deleted before each iteration for reducing the scale of solution space. Both simulations and analysis confirm that the proposed schemes provide improved tradeoff between complexity and performance over traditional detectors.","PeriodicalId":142306,"journal":{"name":"2011 18th International Conference on Telecommunications","volume":"25 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":"121634998","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
Improving the performance of delay based protocol in delivering real time media via early retransmission 通过早期重传提高基于延迟协议的实时媒体传输性能
2011 18th International Conference on Telecommunications Pub Date : 2011-05-08 DOI: 10.1109/CTS.2011.5898979
Zhiyuan Yin, H. Alnuweiri, A. L. Narasimha Reddy, H. Çelebi, K. Qaraqe
{"title":"Improving the performance of delay based protocol in delivering real time media via early retransmission","authors":"Zhiyuan Yin, H. Alnuweiri, A. L. Narasimha Reddy, H. Çelebi, K. Qaraqe","doi":"10.1109/CTS.2011.5898979","DOIUrl":"https://doi.org/10.1109/CTS.2011.5898979","url":null,"abstract":"Early Retransmission (ER) has already been shown to improve TCP-SACK's performance in delivering time sensitive media. In this paper, we integrate the ER scheme into a delay-based TCP variant, namely TCP-PERT, and performs extensive ns2 simulation. Our results show that ER can also improve PERT's performance in delivering real time media by reducing the latency caused by retransmission timeouts. Furthermore, we also explored the improvement brought by employing a finegrained retransmission timer, and compared it with ER. We find out a) ER outperforms fine grained timer in a variety of conditions and b) the combination of the two can further improve performance.","PeriodicalId":142306,"journal":{"name":"2011 18th International Conference on Telecommunications","volume":"6 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":"120956973","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
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
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
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
Flexible hardware architecture of SEFDM transmitters with real-time non-orthogonal adjustment 实时非正交调整SEFDM发射机的柔性硬件结构
2011 18th International Conference on Telecommunications Pub Date : 2011-05-08 DOI: 10.1109/CTS.2011.5898952
M. Perrett, I. Darwazeh
{"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}
引用次数: 31
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
A WDM ring MAN architecture with traffic distribution and collisions avoidance for bandwidth utilization enhancement 一种具有流量分配和避免冲突的WDM环城域网结构，以提高带宽利用率
2011 18th International Conference on Telecommunications Pub Date : 2011-05-08 DOI: 10.1109/CTS.2011.5898945
P. Baziana, I. Pountourakis
{"title":"A WDM ring MAN architecture with traffic distribution and collisions avoidance for bandwidth utilization enhancement","authors":"P. Baziana, I. Pountourakis","doi":"10.1109/CTS.2011.5898945","DOIUrl":"https://doi.org/10.1109/CTS.2011.5898945","url":null,"abstract":"In this paper we study a wavelength division multiplexing multi-ring metropolitan area network architecture with a separate control wavelength and a finite number of access nodes. Each access node is equipped with a fixed tuned transmitter and a fixed tuned receiver for control information exchange. Also, each access node has a tunable transmitter to exploit all data wavelengths while it uses a set of parallel tunable receivers providing suitable tuning time and range to cover all data wavelengths. Our study focuses on the critical problem that many access ring protocols introduce, of limited fiber bandwidth utilization especially at high offered loads. Thus, an efficient slotted access algorithm is applied to avoid data channel collisions and destination conflicts. Also, a multiple transmission buffer architecture is introduced at each node with an effective buffer selection for transmission scheme that combines the priority criteria of receiver collisions avoidance with data packet delay optimization. In this way, significant performance improvement is managed reducing the dropping probability and the total delay experienced, while maximizing throughput. Thus, our network strategy not only manages high scalability and maintenance, but also it achieves maximum bandwidth utilization. A discrete event simulation model is developed to evaluate performance measures.","PeriodicalId":142306,"journal":{"name":"2011 18th International Conference on Telecommunications","volume":"11 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":"122741202","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
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
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