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2006 International Telecommunications Symposium最新文献

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A new algorithm for finding the Shannon cover of shifts of finite type 一种求有限型位移的Shannon覆盖的新算法
2006 International Telecommunications Symposium Pub Date : 2006-09-01 DOI: 10.1109/ITS.2006.4433362
D. Chaves, C. Pimentel
{"title":"A new algorithm for finding the Shannon cover of shifts of finite type","authors":"D. Chaves, C. Pimentel","doi":"10.1109/ITS.2006.4433362","DOIUrl":"https://doi.org/10.1109/ITS.2006.4433362","url":null,"abstract":"A shift of finite type (SFT) is a shift space whose constraints can be represented by a finite list of forbidden words. The deterministic labeled graph with the fewest vertices presenting an irreducible SFT (called the Shannon cover) is obtained, in general, via a two-step procedure: The first step is to generate an initial deterministic presentation, and the second one is to apply a vertex-minimization algorithm to identify classes of equivalent vertices. We propose in this paper an algorithm to generate the Shannon cover of a SFT that firstly identify classes of follower set equivalent words derived from the collection of all first offenders. This identification is not based on the allowable sequences obtained from an initial presentation, as is usually done. Having defined the equivalence classes (or the vertices of the minimal presentation) we apply a procedure to connect the vertices and label the edges that yields the essential component of the follower set graph of the SFT.","PeriodicalId":271294,"journal":{"name":"2006 International Telecommunications Symposium","volume":"34 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":"116909495","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
MIMO measured channels: Capacity results and analysis of channel parameters MIMO测量信道:容量结果和信道参数分析
2006 International Telecommunications Symposium Pub Date : 2006-09-01 DOI: 10.1109/ITS.2006.4433260
R. Vieira, J. Brandão, G. L. Siqueira
{"title":"MIMO measured channels: Capacity results and analysis of channel parameters","authors":"R. Vieira, J. Brandão, G. L. Siqueira","doi":"10.1109/ITS.2006.4433260","DOIUrl":"https://doi.org/10.1109/ITS.2006.4433260","url":null,"abstract":"In this paper we present the results of a MIMO wideband measurement campaign carried out in an indoor scenario with a carrier frequency of 2 GHz. The wideband and narrowband channel capacity and several channel parameters were evaluated from the measured data. The correlation between channel capacity and physical parameters as angle spread, coherence bandwidth, number and power of multipath components was analyzed. The analysis makes possible to characterize the \"rich scattering environment\", a prerequisite condition for high MIMO capacities.","PeriodicalId":271294,"journal":{"name":"2006 International Telecommunications Symposium","volume":"244 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":"120860911","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
The capacity of binders for MIMO digital subscriber lines MIMO数字用户线路的绑定器容量
2006 International Telecommunications Symposium Pub Date : 2006-09-01 DOI: 10.1109/ITS.2006.4433417
D. Zanatta Filho, R. R. Lopes, R. Ferrari, M. Loiola, R. Suyama, G. Simões, C. Wada, J. Romano, B. Dortschy, J. Riu
{"title":"The capacity of binders for MIMO digital subscriber lines","authors":"D. Zanatta Filho, R. R. Lopes, R. Ferrari, M. Loiola, R. Suyama, G. Simões, C. Wada, J. Romano, B. Dortschy, J. Riu","doi":"10.1109/ITS.2006.4433417","DOIUrl":"https://doi.org/10.1109/ITS.2006.4433417","url":null,"abstract":"Crosstalk is one of the main limiting factors in the data rates achievable by digital subscriber line (DSL) systems, and several algorithms have been proposed to mitigate this impairment. In this paper, we compare the capacity of binders under different crosstalk-mitigating techniques. When computing capacity, we also compare two different power constraints: either on the total power in the binder or on the power in each pair. We will see that, for the scenarios considered in this paper, the fact that the signals are jointly processed in one or both ends of the DSL link leads to roughly the same performance, which is far superior to that of systems with no cooperation between the users. Both power constraints also lead to similar achievable rates.","PeriodicalId":271294,"journal":{"name":"2006 International Telecommunications Symposium","volume":"178 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":"128353006","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
Probabilistic access functions for multi-cell wireless schemes 多小区无线方案的概率接入函数
2006 International Telecommunications Symposium Pub Date : 2006-09-01 DOI: 10.1109/ITS.2006.4433331
J. Kirkebo, D. Gesbert, S. G. Kiani
{"title":"Probabilistic access functions for multi-cell wireless schemes","authors":"J. Kirkebo, D. Gesbert, S. G. Kiani","doi":"10.1109/ITS.2006.4433331","DOIUrl":"https://doi.org/10.1109/ITS.2006.4433331","url":null,"abstract":"In recently introduced \"multi-cell access\" schemes, cells (rather than users) compete for the spectral resource. In a previous paper, a framework for such a scheme was proposed, using only local channel information. In the framework each cell competes for access through a credit that is a function of the signal to noise ratio of its scheduled user. Access is then given to a cell with a probability dependent on the access function. In [1] an ad-hoc choice of function was formulated. In this work we investigate which access function actually optimizes the system capacity, utilizing a numerical optimization procedure. We obtain a surprsingly simple solution which also corroborates previous results. For a realistic path loss model we find that our multicell distributed access scheme gives a 19% gain compared to having all cells on, and more than a 50% increase in system capacity compared to keeping a traditional static spectral reuse scheme.","PeriodicalId":271294,"journal":{"name":"2006 International Telecommunications Symposium","volume":"15 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":"128683333","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 cost eye diagram reconstruction and morphological analysis for optical network performance monitoring using digital signal processing techniques 基于数字信号处理技术的低成本眼图重建与形态学分析
2006 International Telecommunications Symposium Pub Date : 2006-09-01 DOI: 10.1109/ITS.2006.4433352
E. Mobilon, M. de Barros, A. Lopes
{"title":"Low cost eye diagram reconstruction and morphological analysis for optical network performance monitoring using digital signal processing techniques","authors":"E. Mobilon, M. de Barros, A. Lopes","doi":"10.1109/ITS.2006.4433352","DOIUrl":"https://doi.org/10.1109/ITS.2006.4433352","url":null,"abstract":"This paper describes the use of a low cost eye diagram reconstruction method, based on digital signal processing techniques, for optical communication network performance monitoring by means of bit error rate (BER) estimation through Gaussian fitting Q-Factor calculation. A morphological analysis of the reconstructed eye diagram is also proposed, which allows for the qualitative investigation of impairments such as amplitude and phase noise as well as signal distortion due to linear and non-linear effects. A complete Eye Diagram Analyzer equipment prototype transparent to signal bit rate was developed and constructed to validate the proposal.","PeriodicalId":271294,"journal":{"name":"2006 International Telecommunications Symposium","volume":"23 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":"127167435","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
Zero-error capacity of quantum channels and noiseless subsystems 量子信道和无噪声子系统的零误差容量
2006 International Telecommunications Symposium Pub Date : 2006-09-01 DOI: 10.1109/ITS.2006.4433399
Rex A. C. Medeiros, Romain Alléaume, Gerard Cohen, Francisco M. de Assis
{"title":"Zero-error capacity of quantum channels and noiseless subsystems","authors":"Rex A. C. Medeiros, Romain Alléaume, Gerard Cohen, Francisco M. de Assis","doi":"10.1109/ITS.2006.4433399","DOIUrl":"https://doi.org/10.1109/ITS.2006.4433399","url":null,"abstract":"This paper investigates connections between the theory of quantum noiseless subsystems and the zero-error capacity of quantum channels. In particular, we show that if we have a noiseless subsystem state p supported by a projector P, then any quantum state with components in the subspace Pperp is adjacent to p. This result has some interesting implications for the quantum states of the optimum (S,V) for which the zero-error capacity is reached.","PeriodicalId":271294,"journal":{"name":"2006 International Telecommunications Symposium","volume":"1 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":"130668564","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: 11
Dispersion characteristics of fin lines with photonic substrate 光子衬底鳍线的色散特性
2006 International Telecommunications Symposium Pub Date : 2006-09-01 DOI: 10.1109/ITS.2006.4433251
Humberto Fernandes, D. Brito
{"title":"Dispersion characteristics of fin lines with photonic substrate","authors":"Humberto Fernandes, D. Brito","doi":"10.1109/ITS.2006.4433251","DOIUrl":"https://doi.org/10.1109/ITS.2006.4433251","url":null,"abstract":"Current and foreseen applications of photonic crystals especially the PBG (Photonic Band Gap) can be divided according to their principle of functioning. In this work an efficient method is presented for the accurate full-wave analyses of the unilateral and bilateral finlines with a 2D PBG material as substrate. To analyze its efficiency, it's necessary to determine the phase, attenuation and effective dielectric constants. In order to analyze the behavior of the structure with this substrate, the full wave TTL (Transversal Transmission Line) method is used. Numerical results for the attenuation and effective dielectric constant of unilateral and bilateral finline with PBG substrate are presented.","PeriodicalId":271294,"journal":{"name":"2006 International Telecommunications Symposium","volume":"19 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":"126875982","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
Fullwave analysis of reflectarrays on double Iso/Anisotropic layers 双Iso/各向异性层反射射线的全波分析
2006 International Telecommunications Symposium Pub Date : 2006-09-01 DOI: 10.1109/ITS.2006.4433316
A. Gouveia de Souza, P.F. Braga, A. D’assunção
{"title":"Fullwave analysis of reflectarrays on double Iso/Anisotropic layers","authors":"A. Gouveia de Souza, P.F. Braga, A. D’assunção","doi":"10.1109/ITS.2006.4433316","DOIUrl":"https://doi.org/10.1109/ITS.2006.4433316","url":null,"abstract":"This work presents a fullwave analysis of reflectarrays composed by a rectangular array of square conducting patches impressed on a grounded substrate with two uniaxial anisotropic layers. The analysis is performed in the spectral domain by using the Green's function technique in combination with the Galerkin method. Numerical results are presented for reflectarrays impressed on iso/anisotropic substrates. For the particular case of reflectarrays on isotropic layers, agreement was observed with results available in the literature.","PeriodicalId":271294,"journal":{"name":"2006 International Telecommunications Symposium","volume":"104 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":"125304659","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
Novel scheduling algorithms aiming for QoS guarantees for VoIP over HSDPA 基于HSDPA的VoIP服务QoS保证调度算法
2006 International Telecommunications Symposium Pub Date : 2006-09-01 DOI: 10.1109/ITS.2006.4433246
A. Braga, E. Rodrigues, F. Cavalcanti
{"title":"Novel scheduling algorithms aiming for QoS guarantees for VoIP over HSDPA","authors":"A. Braga, E. Rodrigues, F. Cavalcanti","doi":"10.1109/ITS.2006.4433246","DOIUrl":"https://doi.org/10.1109/ITS.2006.4433246","url":null,"abstract":"The growth in the number of voice over IP (VoIP) users on the Internet makes it the service with the highest interest to be provided by cellular operators. On the other hand, it demands very strict QoS control, which becomes even more complicated in wireless networks, because packets can be lost due to radio link transmission errors, as well as network congestion. Within this paradigm, scheduling strategies appear as the most suitable solution to cope with QoS guarantees under high loads, where the resources should be carefully distributed among the users in order to fulfill their QoS requirements. This work comprises the proposal and evaluation of some scheduling algorithms aiming to improve system capacity and QoS guarantees for speech users in HSDPA. The results show that the scheduling algorithms that mix fairness with channel information to get improvements of the multi-user diversity provide the best performance.","PeriodicalId":271294,"journal":{"name":"2006 International Telecommunications Symposium","volume":"25 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":"122651241","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
Interactive applications for digital TV using internet legacy - a successful case study 利用互联网遗产进行数字电视互动应用-成功案例研究
2006 International Telecommunications Symposium Pub Date : 2006-09-01 DOI: 10.1109/ITS.2006.4433321
M. Mesquita, O. de Souza
{"title":"Interactive applications for digital TV using internet legacy - a successful case study","authors":"M. Mesquita, O. de Souza","doi":"10.1109/ITS.2006.4433321","DOIUrl":"https://doi.org/10.1109/ITS.2006.4433321","url":null,"abstract":"This paper describes the development of an interactive application for Digital TV. The architectural decisions, drawbacks, solutions, advantages and disadvantages of Interactive Digital TV development are discussed. The application, an e-mail client and its server, are presented and the main considerations about its development are shown, especially a protocol developed for communication between Internet systems and Digital TV systems.","PeriodicalId":271294,"journal":{"name":"2006 International Telecommunications Symposium","volume":"182 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":"132760037","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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