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2006 International Telecommunications Symposium最新文献

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A software development framework based on C++ OOP language for link-level simulation tools 一个基于c++的软件开发框架OOP语言的链路级仿真工具
2006 International Telecommunications Symposium Pub Date : 2006-09-01 DOI: 10.1109/ITS.2006.4433344
C. de Lima, E. Stancanelli, E. Rodrigues, J.M. da S. Maciel, F. Cavalcanti
{"title":"A software development framework based on C++ OOP language for link-level simulation tools","authors":"C. de Lima, E. Stancanelli, E. Rodrigues, J.M. da S. Maciel, F. Cavalcanti","doi":"10.1109/ITS.2006.4433344","DOIUrl":"https://doi.org/10.1109/ITS.2006.4433344","url":null,"abstract":"This article introduces a software development framework, which amasses object-oriented programming (OOP) concepts and designed procedures, intended to systematize the implementation of link-level simulation tools. This development framework is fully implemented in C++ programming language providing modularity and reusability (improving the coding activity). This framework then constitutes remarkable tool for quickly creating link-level applications. Aiming to evaluate the applicability of this software structure, the conversational service class transmitting at 12.2 kbps and over the Wideband CDMA (WCDMA) Downlink (DL) dedicated channel (DCH) is addressed as a case-study and therefore potential benefits of utilizing such development library are identified. It is shown that the development framework provides flexibility for the software development of link-level simulators remarkably reducing the design, programming and testing stages.","PeriodicalId":271294,"journal":{"name":"2006 International Telecommunications Symposium","volume":"145 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131851762","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
A grouping strategy for parallel group detection in synchronous gaussian CDMA channels 一种同步高斯CDMA信道并行组检测的分组策略
2006 International Telecommunications Symposium Pub Date : 2006-09-01 DOI: 10.1109/ITS.2006.4433311
M. Marcal, T. Vinhoza, F. D. Backx, R. Sampaio-Neto
{"title":"A grouping strategy for parallel group detection in synchronous gaussian CDMA channels","authors":"M. Marcal, T. Vinhoza, F. D. Backx, R. Sampaio-Neto","doi":"10.1109/ITS.2006.4433311","DOIUrl":"https://doi.org/10.1109/ITS.2006.4433311","url":null,"abstract":"In this paper a group detection technique is addressed. After recalling some concepts of the decorrelating detector and the optimum multiuser detector, a parallel group detector which combines the advantages of both structures is introduced. The receiver derived here exploits the signal users' correlation in an uplink synchronous code-division multiple access channel, resulting in a structure whose performance ranges from the decorrelating detector to the optimum multiuser detector, depending on the number of groups and on the number of users assigned to those groups. As in group detection the problem of how to compose groups arises, a grouping strategy that minimizes the bit error probability of the user with worst performance in the entire system is developed. Examples illustrating the performance of the proposed grouping strategy are also provided.","PeriodicalId":271294,"journal":{"name":"2006 International Telecommunications Symposium","volume":"49 6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133046319","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
Quality of service evaluation of VoIP over HSDPA 基于HSDPA的VoIP服务质量评价
2006 International Telecommunications Symposium Pub Date : 2006-09-01 DOI: 10.1109/ITS.2006.4433364
L.R.N. Sousa, M. Carvalho, E. Rodrigues, L. Sampaio, F. Cavalcanti
{"title":"Quality of service evaluation of VoIP over HSDPA","authors":"L.R.N. Sousa, M. Carvalho, E. Rodrigues, L. Sampaio, F. Cavalcanti","doi":"10.1109/ITS.2006.4433364","DOIUrl":"https://doi.org/10.1109/ITS.2006.4433364","url":null,"abstract":"In this paper we investigate the characteristics of the Voice over IP service deployed over 3G mobile network HSDPA. The necessary protocols for Voice over IP may provide controlled delivery of multimedia traffic over Internet and wireless technologies. We evaluate the VoIP service using a simulator that models the HSDPA system. Results are manifested in terms of packet loss rate, delay and delay jitter, which are important performance measures to guarantee QoS. Moreover, the VoIP performance depends on the system capacity and radio access channel configurations. The understanding of how the VoIP service behaves under different system configurations is given in terms of offered traffic load and wireless channel error probability.","PeriodicalId":271294,"journal":{"name":"2006 International Telecommunications Symposium","volume":"127 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115622646","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
Modeling, simulation and estimation of PLC channels PLC通道的建模、仿真和估计
2006 International Telecommunications Symposium Pub Date : 2006-09-01 DOI: 10.1109/ITS.2006.4433270
Rodrigo S. Mello, M. Grivet
{"title":"Modeling, simulation and estimation of PLC channels","authors":"Rodrigo S. Mello, M. Grivet","doi":"10.1109/ITS.2006.4433270","DOIUrl":"https://doi.org/10.1109/ITS.2006.4433270","url":null,"abstract":"The growth interest on the use of low voltage power distribution grid as an alternative to provide telecommunication services has strongly motivated the development of systems which are able to surpass the hostile characteristics of this environment as a communication channel. This work aims to estimate the behavior of PLC (Power Line Communication) networks by means of its transfer function modeling and estimation. An electrical model for the PLC network is presented that allows generating realistic estimations of its transfer function that are simple from the computational viewpoint. Next a well-known mathematical model is presented that describes the complex frequency response of power line channels, covering effects such as multipath propagation and frequency selective fading. Finally, this model is used to produce a novel low complexity procedure for its parameter's estimation. Some tests with synthetic data are presented that reveals a satisfactory adjustment.","PeriodicalId":271294,"journal":{"name":"2006 International Telecommunications Symposium","volume":"110 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115715943","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: 5
Hmm topology in continuous speech recognition systems 连续语音识别系统中的Hmm拓扑
2006 International Telecommunications Symposium Pub Date : 2006-09-01 DOI: 10.1109/ITS.2006.4433354
G. Yared, F. Violaro, A.M. Selmini
{"title":"Hmm topology in continuous speech recognition systems","authors":"G. Yared, F. Violaro, A.M. Selmini","doi":"10.1109/ITS.2006.4433354","DOIUrl":"https://doi.org/10.1109/ITS.2006.4433354","url":null,"abstract":"Nowadays, HMM-based speech recognition systems are used in many real time processing applications, from cell phones to automobile automation. In this context, one important aspect to be considered is the HMM model size, which directly determines the computational load. So, in order to make the system practical, it is interesting to optimize the HMM model size constrained to a minimum acceptable recognition performance. Furthermore, topology optimization is also important for reliable parameter estimation. This work presents the new Gaussian Elimination Algorithm (GEA) for determining the more suitable HMM complexity in continuous speech recognition systems. The proposed method is evaluated on a small vocabulary continuous speech (SVCS) database as well as on the TIMIT corpus.","PeriodicalId":271294,"journal":{"name":"2006 International Telecommunications Symposium","volume":"140 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114504957","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
Matching extensions of cyclic groups 循环群的匹配扩展
2006 International Telecommunications Symposium Pub Date : 2006-09-01 DOI: 10.1109/ITS.2006.4433385
J. Arpasi
{"title":"Matching extensions of cyclic groups","authors":"J. Arpasi","doi":"10.1109/ITS.2006.4433385","DOIUrl":"https://doi.org/10.1109/ITS.2006.4433385","url":null,"abstract":"In this work we show that the generalized dihedral and quaternion groups are particular cases of extension of cyclic groups. For both classes of groups, Bali and Selvakumaran found matching maps with specific APSK signal sets. Considering generalized extension of cyclic groups we find other groups matched to signal sets, and also we show that this consideration improves the Squared Euclidean Distance of the matching of the dihedral and quaternion groups.","PeriodicalId":271294,"journal":{"name":"2006 International Telecommunications Symposium","volume":"88 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114549895","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
Switching linear turbo equalizers with three vector of coefficients 切换线性涡轮均衡器与三个矢量的系数
2006 International Telecommunications Symposium Pub Date : 2006-09-01 DOI: 10.1109/ITS.2006.4433327
L. Cavalcanti de Sa Neto, J. F. Galdino, E. Pinto
{"title":"Switching linear turbo equalizers with three vector of coefficients","authors":"L. Cavalcanti de Sa Neto, J. F. Galdino, E. Pinto","doi":"10.1109/ITS.2006.4433327","DOIUrl":"https://doi.org/10.1109/ITS.2006.4433327","url":null,"abstract":"We propose in this article the use of linear turbo equalization schemes in which the equalizer coefficients, for the sake of complexity reduction, are switched between three vectors of coefficients previously calculated. Techniques for choosing the switching point are developed and evaluated. Simulation results of performance comparison against the MMSE equalizer proposed in [1] are also provided. It is shown that the schemes herein described perform close to the MMSE equalizer, despite being much less complex.","PeriodicalId":271294,"journal":{"name":"2006 International Telecommunications Symposium","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114600579","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
An algebraic receiver for full response CPM demodulation 全响应CPM解调的代数接收机
2006 International Telecommunications Symposium Pub Date : 2006-09-01 DOI: 10.1109/ITS.2006.4433304
A. Neves, M. Mboup, M. Fliess
{"title":"An algebraic receiver for full response CPM demodulation","authors":"A. Neves, M. Mboup, M. Fliess","doi":"10.1109/ITS.2006.4433304","DOIUrl":"https://doi.org/10.1109/ITS.2006.4433304","url":null,"abstract":"This paper proposes a new algebraic demodulation method for full response CPM signals in AWGN channel. The method is based in a new estimation/identification theory that has also already been used for channel identification and signal deconvolution. The signals and noise are considered to be deterministic and we find an explicit formula for the recovery of the transmitted symbols. Based on this formula, the symbols are recovered blindly, needing only the knowledge of the modulation index. The method is not only simple and robust to noise, but also very fast, what enables its implementation on-line. It can also be equally used for coherent or non-coherent demodulations. The method is applied to the CPFSK and LRC families of signals showing good results.","PeriodicalId":271294,"journal":{"name":"2006 International Telecommunications Symposium","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114858247","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: 15
On the Nakagami-m autocorrelation and power spectrum functions: Field trials and validation 关于Nakagami-m自相关和功率谱函数:现场试验和验证
2006 International Telecommunications Symposium Pub Date : 2006-09-01 DOI: 10.1109/ITS.2006.4433279
U. Silva Dias, M. Daoud Yacoub, J. Filho, G. Fraidenraich, D. Benevides da Costa
{"title":"On the Nakagami-m autocorrelation and power spectrum functions: Field trials and validation","authors":"U. Silva Dias, M. Daoud Yacoub, J. Filho, G. Fraidenraich, D. Benevides da Costa","doi":"10.1109/ITS.2006.4433279","DOIUrl":"https://doi.org/10.1109/ITS.2006.4433279","url":null,"abstract":"Indoor and outdoor field trial measurements are used to validate the analytical autocorrelation and power spectrum of the Nakagami-m fading channel. Comparisons are performed and an excellent fit to the fiel measurements is observed. In passing, an accurate closed-form approximation to the Nakagami-m power spectrum is derived.","PeriodicalId":271294,"journal":{"name":"2006 International Telecommunications Symposium","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123415058","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: 7
On the construction of unit databanks for text-to-speech systems 文转语音系统中单元数据库的构建
2006 International Telecommunications Symposium Pub Date : 2006-09-01 DOI: 10.1109/ITS.2006.4433295
V. Latsch, S. L. Netto
{"title":"On the construction of unit databanks for text-to-speech systems","authors":"V. Latsch, S. L. Netto","doi":"10.1109/ITS.2006.4433295","DOIUrl":"https://doi.org/10.1109/ITS.2006.4433295","url":null,"abstract":"This work deals with one stage in the development of a text-to-speech (TTS) system, which demands a great amount of time and effort, and is strongly related to the resulting speech quality: The determination of the speech-unit databank. For that matter, we present a software tool, the so-called Editor, integrating all major steps in the database determination in a single environment. The whole process includes recording, segmentation, and labeling of speech units to be concatenated in the time domain. The Editor includes a low-cost and precise method for determining the pitch marks, utilizing an auxiliary signal obtained from a contact (throat) microphone. For the phonetic speech labeling, we revise an algorithm for acoustic segmentation, which yields interesting results when proper operation conditions are imposed. The result is a simplified procedure for creating a complete unit database, fully integrated into a single and user- friendly system.","PeriodicalId":271294,"journal":{"name":"2006 International Telecommunications Symposium","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123565810","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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