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2006 International Telecommunications Symposium最新文献

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Adaptive equalization based on watermarking 基于水印的自适应均衡
2006 International Telecommunications Symposium Pub Date : 2006-09-01 DOI: 10.1109/ITS.2006.4433371
M. U. Neto, L. C. Gomes, J. Romano, M. Bonnet
{"title":"Adaptive equalization based on watermarking","authors":"M. U. Neto, L. C. Gomes, J. Romano, M. Bonnet","doi":"10.1109/ITS.2006.4433371","DOIUrl":"https://doi.org/10.1109/ITS.2006.4433371","url":null,"abstract":"This paper presents an adaptive equalization method based on the use of a watermark as reference signal. Instead of interrupting communication periodically to transmit training sequences, a watermark is transmitted continuously through the channel along with the user signal. By analyzing the received watermark, the equalization filter is continuously adapted to match the channel characteristics. When dealing with correlated user signals, a prediction-error filter is introduced to whiten the equalizer output before comparing it to the reference signal (the watermark), allowing for the appropriate inversion of the channel transfer function. Simulation results are presented to demonstrate the viability of this approach.","PeriodicalId":271294,"journal":{"name":"2006 International Telecommunications Symposium","volume":"28 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":"131416824","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
Outer-loop power control based on hybrid ARQ protocol for WCDMA enhanced uplink 基于混合ARQ协议的WCDMA增强型上行链路外环功率控制
2006 International Telecommunications Symposium Pub Date : 2006-09-01 DOI: 10.1109/ITS.2006.4433360
C. de Lima, K. Larsson, P. Okvist
{"title":"Outer-loop power control based on hybrid ARQ protocol for WCDMA enhanced uplink","authors":"C. de Lima, K. Larsson, P. Okvist","doi":"10.1109/ITS.2006.4433360","DOIUrl":"https://doi.org/10.1109/ITS.2006.4433360","url":null,"abstract":"In this article, a node B-located outer-loop power control (OLPC) algorithm for WCDMA enhanced uplink (E-UL) based on the number of hybrid automatic repeat request (HARQ) transmission attempts is introduced. The proposed OLPC algorithm can take full advantage of the HARQ protocol since its operation is not affected by the signaling delay between node B and radio network controller (RNC). However, when the Node B-located OLPC is considered in a soft handover (SHO) situation, the Carrier-to-interference Ratio (CIR)-drift problem that emerges compromises the OLPC performance, and some mechanism to compensate for the CIR-drift problem is required. Both an aggressively tuned anti-windup function and an retransmission sequence number (RSN)-based functionality handle this problem. The proposed Node B-located OLPC is evaluated for 2 ms and 10 ms transmission time intervals (TTIs). It is observed that the Node B-located OLPC provides gains in terms of lower CIR and is more beneficial for 2 ms TTI, since the RNC signaling delay has rather severe impact in a shorter round trip time (RTT).","PeriodicalId":271294,"journal":{"name":"2006 International Telecommunications Symposium","volume":"25 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132639015","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
Novel frequency domain finite element formulation for optical circuits in nonlinear photonic crystals 非线性光子晶体光学电路的新频域有限元公式
2006 International Telecommunications Symposium Pub Date : 2006-09-01 DOI: 10.1109/ITS.2006.4433253
C. E. Rubio-Mercedes, V. Rodriguez‐Esquerre, H. Hernández-Figueroa
{"title":"Novel frequency domain finite element formulation for optical circuits in nonlinear photonic crystals","authors":"C. E. Rubio-Mercedes, V. Rodriguez‐Esquerre, H. Hernández-Figueroa","doi":"10.1109/ITS.2006.4433253","DOIUrl":"https://doi.org/10.1109/ITS.2006.4433253","url":null,"abstract":"An efficient technique based on the finite element method in the frequency domain for the analysis of nonlinear photonic crystals based optical circuits is here presented. The solution of the nonlinear Helmholtz equation is obtained by an iterative process involving linear problem solutions. The present approach uses isoparametric curvilinear elements for the spatial discretization and perfectly matched layers to truncate the computational domain. Numerical examples are presented in order to validate the efficiency of the present method.","PeriodicalId":271294,"journal":{"name":"2006 International Telecommunications Symposium","volume":"2 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":"128439874","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
8-Channel dynamic optical power equalizer for WDM networks WDM网络的8通道动态光功率均衡器
2006 International Telecommunications Symposium Pub Date : 2006-09-01 DOI: 10.1109/ITS.2006.4433395
A. Mocki, T.M. do Amaral, A. Pohl
{"title":"8-Channel dynamic optical power equalizer for WDM networks","authors":"A. Mocki, T.M. do Amaral, A. Pohl","doi":"10.1109/ITS.2006.4433395","DOIUrl":"https://doi.org/10.1109/ITS.2006.4433395","url":null,"abstract":"An 8-channel dynamic power equalizer is simulated in the backbone of the GiGA network. Results show how the power of added OADM channels contributes to the power imbalance of the network and to the OSNR of transmitted channels. An 8-channel equalizer is also assembled and successfully tested at the test bench.","PeriodicalId":271294,"journal":{"name":"2006 International Telecommunications Symposium","volume":"68 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":"134243490","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
Assessing algorithms to remove back-to-front interference in documents 评估消除文档中前后干扰的算法
2006 International Telecommunications Symposium Pub Date : 2006-09-01 DOI: 10.1145/1244002.1244142
R. Lins, J. G. M. Silva, Fernando Mário Junqueira Martins
{"title":"Assessing algorithms to remove back-to-front interference in documents","authors":"R. Lins, J. G. M. Silva, Fernando Mário Junqueira Martins","doi":"10.1145/1244002.1244142","DOIUrl":"https://doi.org/10.1145/1244002.1244142","url":null,"abstract":"Documents written on both sides on translucent paper make visible the ink from one side on the other. This artifact is called \"back-to-front interference\" or \"bleeding\". The direct binarization of documents with such interference yields unreadable documents. The literature presents several algorithms for suitably removing such artifact. This paper presents a quantitative method to assess algorithms to remove back-to-front interference.","PeriodicalId":271294,"journal":{"name":"2006 International Telecommunications Symposium","volume":"95 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":"134391620","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: 26
A fuzzy approach for adaptive control of MPLS network traffic flows 一种模糊自适应控制MPLS网络流量的方法
2006 International Telecommunications Symposium Pub Date : 2006-09-01 DOI: 10.1109/ITS.2006.4433236
L. Sousa, F. Vieira, Luan L. Lee
{"title":"A fuzzy approach for adaptive control of MPLS network traffic flows","authors":"L. Sousa, F. Vieira, Luan L. Lee","doi":"10.1109/ITS.2006.4433236","DOIUrl":"https://doi.org/10.1109/ITS.2006.4433236","url":null,"abstract":"One of the major challenges nowadays when managing IP networks is to guarantee proper quality of service by using network infrastructure in an optimized way. One of the recently proposed solutions is the so called traffic engineering with MPLS. In this paper, we propose a novel approach for adaptive fuzzy model-based flow control in MPLS networks. Current research treats MPLS as the Internet's solution to high performance network. A nonlinear predictive controller is designed on the basis of a Takagi-Sugeno fuzzy model. By online adaptation of the fuzzy model, high control performance can be achieved for network traffic processes multiplexed in a single buffer server. Our developed fuzzy predictor consists of a two-step algorithm: an adaptive training with covariance resetting and a gradient-based learning algorithm for refining the first part of the learning procedure. The effectiveness and online applicability of the proposed approach are demonstrated by simulations using real network traffic traces. In fact, the proposed approach is capable of providing better system performance than some existing flow control schemes.","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":"133126322","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
Access selection with connection reallocation for multi-access networks 多址网络中带连接再分配的接入选择
2006 International Telecommunications Symposium Pub Date : 2006-09-01 DOI: 10.1109/ITS.2006.4433347
V. de Sousa, R.A. de O. Neto, F. de S. Chaves, L. Cardoso, F. Cavalcanti
{"title":"Access selection with connection reallocation for multi-access networks","authors":"V. de Sousa, R.A. de O. Neto, F. de S. Chaves, L. Cardoso, F. Cavalcanti","doi":"10.1109/ITS.2006.4433347","DOIUrl":"https://doi.org/10.1109/ITS.2006.4433347","url":null,"abstract":"This paper presents the study of the access selection (AS) problem in a multi-access wireless network. The contributions of this paper could be classified in two groups. Firstly, we extend previous investigations in terms of performance results, regarding a system-level dynamic evaluation. Performance indicators like coverage, SNR, rate and offered traffic load are included as algorithm criteria. An AS algorithm based on theoretical throughput estimation is also evaluated. Secondly, we propose a sub-optimum access selection solution, in which the arriving user as well as a few ongoing users are (re)assigned according to the new systems' conditions, following the specific optimization criterion. This solution selects candidate users to a vertical handover and anticipates the user context transfer. The approaches presented here assume a generic system modeling and user throughput characteristics as performance indicator. Analytical expectations are confirmed by means of simulation campaigns. Then, we could demonstrate that the access selection with connection reallocation provides gains about 290% in the 10th percentile of the user session throughput.","PeriodicalId":271294,"journal":{"name":"2006 International Telecommunications Symposium","volume":"322 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":"122705200","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
Correlating multiple redundant scales for corner detection 关联多个冗余尺度进行角点检测
2006 International Telecommunications Symposium Pub Date : 2006-09-01 DOI: 10.1109/ITS.2006.4433379
I. C. de Paula, F. Medeiros, G.A. Mendonca, Cornélia J. P. Passarinho, Isaura N. S. Oliveira
{"title":"Correlating multiple redundant scales for corner detection","authors":"I. C. de Paula, F. Medeiros, G.A. Mendonca, Cornélia J. P. Passarinho, Isaura N. S. Oliveira","doi":"10.1109/ITS.2006.4433379","DOIUrl":"https://doi.org/10.1109/ITS.2006.4433379","url":null,"abstract":"Corner detection is an important task in computer vision and image processing applications. Basically, corners are high curvature points (HCP), which can be detected by contour analysis. In this paper we propose an approach to detect corners using multiscale analysis. The algorithm provides an undecimated wavelet decomposition of the angulation signal of a shape contour and the high curvature points are identified by correlating multiple redundant scales. The goal is to detect the dominant points of a shape that accurately represent it. Assessment results have shown that the method succeeded in reconstructing the shape contour using the detected HCPs. A novel evaluation measure is also presented in order to confirm that the proposed algorithm outperforms other methods used for testing and comparison purposes. The technique is promising and effective for image retrieval applications.","PeriodicalId":271294,"journal":{"name":"2006 International Telecommunications Symposium","volume":"9 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":"128006939","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 new quasi-Yagi bowtie type integrated antenna 一种新型准八木结型集成天线
2006 International Telecommunications Symposium Pub Date : 2006-09-01 DOI: 10.1109/ITS.2006.4433320
F. Costa, G. Fontgalland, A. D’assunção, T. Vuong, L. M. Mendonça
{"title":"A new quasi-Yagi bowtie type integrated antenna","authors":"F. Costa, G. Fontgalland, A. D’assunção, T. Vuong, L. M. Mendonça","doi":"10.1109/ITS.2006.4433320","DOIUrl":"https://doi.org/10.1109/ITS.2006.4433320","url":null,"abstract":"This work presents an optimized broadband quasi-Yagi planar antenna with a new driver configuration that looks like a bowtie antenna for wireless communication applications. The proposed quasi-Yagi antenna represents an improvement over existing printed antenna topologies, simultaneously exhibiting increased bandwidth, excellent radiation properties, and simple construction. The antenna was firstly designed to work at 2.4 GHz, satisfying the standards of Bluetooth system and WLAN, and finally was optimized to include the frequency of 1.9 GHz and PCS applications. The simulation and design optimization were done by a commercial software, CST Microwave Studio, that uses the Finite Integration Technique (FIT). Numerical results are compared to measured ones and good agreement is observed.","PeriodicalId":271294,"journal":{"name":"2006 International Telecommunications Symposium","volume":"54 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":"129219725","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: 14
A variable priorities MAC protocol for Broadband Wireless Access with improved channel utilization among stations 一种用于宽带无线接入的可变优先级MAC协议，提高了站间信道利用率
2006 International Telecommunications Symposium Pub Date : 2006-09-01 DOI: 10.1109/ITS.2006.4433306
L.F.M. de Moraes, P. D. Maciel
{"title":"A variable priorities MAC protocol for Broadband Wireless Access with improved channel utilization among stations","authors":"L.F.M. de Moraes, P. D. Maciel","doi":"10.1109/ITS.2006.4433306","DOIUrl":"https://doi.org/10.1109/ITS.2006.4433306","url":null,"abstract":"The Broadband Wireless Access (BWA) technology has been proposed to support different traffic classes with distinct quality of service (QoS) requirements in broadband metropolitan area networks. Therefore, as part of its specifications, such a system must properly address the combined requirements of wireless communications and multimedia applications. We propose in this paper an extension to the MAC protocol presented in [1, 2], by assigning variable priorities to the network stations sharing access to the communication channel. An analytical model to evaluate the performance of the proposed protocol is also developed and results obtained for the messages waiting times at different stations are presented. In addition, simulation data are used to compare the results obtained from the analytical model presented previously. It is concluded that the proposed variable priority MAC protocol is able to improve channel utilization and provide throughput and queueing delay fairness among the stations in the network.","PeriodicalId":271294,"journal":{"name":"2006 International Telecommunications Symposium","volume":"87 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":"116840075","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: 9
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