European Transactions on Telecommunications最新文献

Session and media signalling for communication components‐based open multimedia conferencing Web service over IP networks 基于IP网络的开放式多媒体会议Web服务的通信组件的会话和媒体信令

European Transactions on Telecommunications Pub Date : 2011-12-01 DOI: 10.1002/ETT.1494

Cheng Bo, Hu Xiaoxiao, Z. Shicheng, Chen Junliang

{"title":"Session and media signalling for communication components‐based open multimedia conferencing Web service over IP networks","authors":"Cheng Bo, Hu Xiaoxiao, Z. Shicheng, Chen Junliang","doi":"10.1002/ETT.1494","DOIUrl":"https://doi.org/10.1002/ETT.1494","url":null,"abstract":"Service-oriented communication is a new trend in the industry to enable communication through a service-oriented architecture (SOA) and thereby package communications as services, which opens a new paradigm of Web service-based Voice Over Internet Protocol communication, which is extensible and can be easily integrated in end-to-end SOA solutions. In this paper, we proposed the communication components-based open multimedia conferencing Web service over IP networks and mainly focus on the session and media signalling for multimedia conferencing Web service. Details including the multimedia conferencing multiple parties call control state machines and session management, the state life cycle management, and the signal flows for multimedia conferencing scenarios, also including the Simple Object Access Protocol messages mapping to the asynchronous events. The session and media signalling management also provides the Web services interfaces for triggering conferencing session establishment and is further responsible for all necessary media signalling towards a proper media server. In addition, a prototype has been implemented, and its performance has been measured and analysed. Finally, we give the conclusions and future work. Copyright © 2011 John Wiley & Sons, Ltd.","PeriodicalId":50473,"journal":{"name":"European Transactions on Telecommunications","volume":"45 1","pages":"435-450"},"PeriodicalIF":0.0,"publicationDate":"2011-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73770217","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

A passive location system for single frequency networks using digital terrestrial TV signals 一种使用数字地面电视信号的单频网络无源定位系统

European Transactions on Telecommunications Pub Date : 2011-12-01 DOI: 10.1002/ett.1498

Jun Yan, Lenan Wu

引用次数: 19

Cross-layer design for double-string cooperative communications in wireless ad-hoc networks 无线自组织网络中双串协作通信的跨层设计

European Transactions on Telecommunications Pub Date : 2011-12-01 DOI: 10.1002/ett.1497

Simone Sergi, F. Pancaldi, G. Vitetta

引用次数: 8

Round-robin power control for the weighted sum rate maximisation of wireless networks over multiple interfering links 多干扰链路无线网络加权和速率最大化的轮询功率控制

European Transactions on Telecommunications Pub Date : 2011-12-01 DOI: 10.1002/ett.1496

Chung Shue Chen, K. Shum, C. Sung

引用次数: 33

On cost-sharing mechanisms in cognitive radio networks 认知无线网络成本分担机制研究

European Transactions on Telecommunications Pub Date : 2011-12-01 DOI: 10.1002/ett.1501

Shabnam Sodagari, S. Bilén

引用次数: 8

VCAT synchroniser - reduction of buffer size in VCAT enabled next generation SDH networks VCAT同步器-在支持VCAT的下一代SDH网络中减少缓冲区大小

European Transactions on Telecommunications Pub Date : 2011-12-01 DOI: 10.1002/ett.1500

Sunanda Manke, K. Khare, S. Sapre

{"title":"VCAT synchroniser - reduction of buffer size in VCAT enabled next generation SDH networks","authors":"Sunanda Manke, K. Khare, S. Sapre","doi":"10.1002/ett.1500","DOIUrl":"https://doi.org/10.1002/ett.1500","url":null,"abstract":"Next generation synchronous digital hierarchy is a popular transport technology for integrated voice and data communication. It typically uses virtual concatenation (VCAT) for dynamic bandwidth management. This paper discusses different issues related to VCAT. Paper mainly focuses on the differential delay that occurs as all the VCAT members traverse through different path to reach the destination. These streams do not reach the destination at the same time and thus incur differential delay. Buffers are provided at the receiver to compensate for differential delay. The larger the differential delay, the larger is the buffer requirement at the receiver. Differential delay/buffer size can be reduced by proper routing of the traffic. In the existing receiver circuits, all incoming streams are allocated the same buffer space, specifying the maximum differential delay it can compensate. This results in a large buffer requirement. To overcome this limitation, this paper proposes a novel scheme of allocating buffers dynamically to all the streams. To achieve this, differential delay between the streams is computed by extracting the multiframe indicator and then as per the delay, each stream is allocated buffer space from a common buffer pool. The common buffer pool consists of a number of buffer modules. The size of each module is equal to the frame size for the specific virtual channel, and the size of the common buffer pool is architecture dependent. Sixty per cent reduction in the buffer requirement is predicted using this scheme, at the receiver. For functional verification of the concept, a hardware circuit is designed. Copyright © 2011 John Wiley & Sons, Ltd.","PeriodicalId":50473,"journal":{"name":"European Transactions on Telecommunications","volume":"7 1","pages":"500-514"},"PeriodicalIF":0.0,"publicationDate":"2011-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87799603","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

Energy-aware multipath geographic routing for detouring mode in wireless sensor networks 无线传感器网络绕行模式的能量感知多路径地理路由

European Transactions on Telecommunications Pub Date : 2011-11-01 DOI: 10.1002/ett.1490

Haojun Huang, Guangmin Hu, Fucai Yu

引用次数: 20

A comparison of iterative MIMO receivers under channel uncertainty 信道不确定条件下迭代MIMO接收机的比较

European Transactions on Telecommunications Pub Date : 2011-11-01 DOI: 10.1002/ett.1489

M. Qaisrani, S. M. R. Naqvi

引用次数: 1

Rateless codes aided coherent M-ary PSK systems in the presence of receiver imperfections and Rician fading 无速率码辅助相干m - ry PSK系统在存在接收机缺陷和信号衰落的情况下

European Transactions on Telecommunications Pub Date : 2011-11-01 DOI: 10.1002/ett.1487

Jing Yang, Jianping An, Xiangming Li, L. Yuan

{"title":"Rateless codes aided coherent M-ary PSK systems in the presence of receiver imperfections and Rician fading","authors":"Jing Yang, Jianping An, Xiangming Li, L. Yuan","doi":"10.1002/ett.1487","DOIUrl":"https://doi.org/10.1002/ett.1487","url":null,"abstract":"In this paper, we study the bit error rate (BER) and the symbol error probability (SEP) performance for a rateless coded M-ary phase-shift keying (MPSK) system in a situation where stochastic phase error, quadrature error and in-phase–quadrature (I–Q) gain mismatch take place all concurrently over a Rician fading channel. Similar scenario has been considered before by Djordjevic et al. for quasi-cyclic low-density parity-check (QC-LDPC) codes, but the effect of I–Q gain mismatch is not correctly modeled, because the Gaussian noise components in I and Q paths are assumed to have the same variance. By taking two different Gaussian noise variances into consideration, precise expressions are derived for the SEP of a coherent MPSK system under the aforementioned condition (with the stochastic phase error depicted by Tikhonov distribution), thus providing a baseline to evaluate the merits of the proposed rateless coded system and that of QC-LDPC codes. The validity of the rateless coded system is substantiated by simulation results. It is observed that rateless codes outperform QC-LDPC codes even the I–Q gain mismatch is modeled in the same way as Djordjevic's work when the target BER is lower than 10−2. Copyright © 2011 John Wiley & Sons, Ltd.","PeriodicalId":50473,"journal":{"name":"European Transactions on Telecommunications","volume":"70 1","pages":"367-374"},"PeriodicalIF":0.0,"publicationDate":"2011-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83275817","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: 4

Performance analysis of a TH/DS N-ary BPPM UWB system TH/DS n进位BPPM超宽带系统性能分析

European Transactions on Telecommunications Pub Date : 2011-11-01 DOI: 10.1002/ett.1493

Ye-Shun Shen, Fang-Biau Ueng

引用次数: 1