发布求助
文献互助 智能选刊 最新文献

ITS'98 Proceedings. SBT/IEEE International Telecommunications Symposium (Cat. No.98EX202)最新文献

筛选
英文 中文
Novel robust RM-KNN filters with impulsive noise suppression for image processing 基于脉冲噪声抑制的新型鲁棒RM-KNN滤波器
ITS'98 Proceedings. SBT/IEEE International Telecommunications Symposium (Cat. No.98EX202) Pub Date : 1998-08-09 DOI: 10.1109/ITS.1998.718474
V. Ponomaryov, A.B. Pogrebniak, F. Gonzales Leon
{"title":"Novel robust RM-KNN filters with impulsive noise suppression for image processing","authors":"V. Ponomaryov, A.B. Pogrebniak, F. Gonzales Leon","doi":"10.1109/ITS.1998.718474","DOIUrl":"https://doi.org/10.1109/ITS.1998.718474","url":null,"abstract":"We introduce novel robust filtering algorithms applicable to image processing. They are derived by use of RM-type point estimations and the restriction technique of the well-known, specifically for image processing, KNN filter. The derived RM-KNN filters effectively remove impulsive noise while edge and fine details are preserved. The proposed filters are tested on simulated images and real imaging radar data and provide excellent visual quality of the processed images and good quantitative quality in comparison with the standard median filter. Recommendations to obtain the best processing results by proper selection of derived filter parameters are given.","PeriodicalId":205350,"journal":{"name":"ITS'98 Proceedings. SBT/IEEE International Telecommunications Symposium (Cat. No.98EX202)","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114179109","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
Limits on bit rate capacity improvement induced by SPM in installed standard fiber links at 1550 nm 在1550nm安装的标准光纤链路中由SPM引起的比特率容量改进限制
ITS'98 Proceedings. SBT/IEEE International Telecommunications Symposium (Cat. No.98EX202) Pub Date : 1998-08-09 DOI: 10.1109/ITS.1998.718464
M. Freitas, R.T.R. de Almeida, M. Ribeiro, L. Calmon
{"title":"Limits on bit rate capacity improvement induced by SPM in installed standard fiber links at 1550 nm","authors":"M. Freitas, R.T.R. de Almeida, M. Ribeiro, L. Calmon","doi":"10.1109/ITS.1998.718464","DOIUrl":"https://doi.org/10.1109/ITS.1998.718464","url":null,"abstract":"Limits are obtained to a method which utilizes fiber nonlinearity (self phase modulation) to increase the bit-rate capacity of installed single channel non-dispersion-shifted fiber links at a wavelength of 1550 nm. We focus on a set-up that uses no in-line optical amplifiers. Maximum attainable bit rate versus distance are obtained under optimal transmitted powers for different pulse shapes, which may be helpful in designing optical fiber systems. Substantial improvements are possible and better performance has been achieved for smooth pulses. A practical example of bit-rate upgrading in an installed link is shown and compared with experimental papers.","PeriodicalId":205350,"journal":{"name":"ITS'98 Proceedings. SBT/IEEE International Telecommunications Symposium (Cat. No.98EX202)","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114724131","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
A neural network model applied to the detection of digital signals 一种用于数字信号检测的神经网络模型
ITS'98 Proceedings. SBT/IEEE International Telecommunications Symposium (Cat. No.98EX202) Pub Date : 1998-08-09 DOI: 10.1109/ITS.1998.713132
Marcelo A. C. Fernandes, A. Neto, J. B. Bezerra
{"title":"A neural network model applied to the detection of digital signals","authors":"Marcelo A. C. Fernandes, A. Neto, J. B. Bezerra","doi":"10.1109/ITS.1998.713132","DOIUrl":"https://doi.org/10.1109/ITS.1998.713132","url":null,"abstract":"This work presents an artificial neural network (ANN) approach for the signal decision problems associated with digital communication system receivers which use modulation schemes whose signal elements belong to finite bidimensional constellations. The decision system proposed, named a neural decoder (ND), is a multilayer perceptron neural network trained with a backpropagation algorithm and models a maximum-likelihood receiver. The ND training process and simulation results of their performance, regarding a conventional receiver, are presented for some of the modulation systems studied.","PeriodicalId":205350,"journal":{"name":"ITS'98 Proceedings. SBT/IEEE International Telecommunications Symposium (Cat. No.98EX202)","volume":"96 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123514778","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
Soliton switching in triangular three-core nonlinear directional fiber coupler 三角形三芯非线性定向光纤耦合器中的孤子开关
ITS'98 Proceedings. SBT/IEEE International Telecommunications Symposium (Cat. No.98EX202) Pub Date : 1998-08-09 DOI: 10.1109/ITS.1998.718463
M. da Silva, A. F. Teles, A. Sombra
{"title":"Soliton switching in triangular three-core nonlinear directional fiber coupler","authors":"M. da Silva, A. F. Teles, A. Sombra","doi":"10.1109/ITS.1998.718463","DOIUrl":"https://doi.org/10.1109/ITS.1998.718463","url":null,"abstract":"We present an analytical investigation of the propagation and the switching of fundamental solitons in a triangular three-core nonlinear fiber coupler with a variational method using the Lagrangian density formulation. The analytical solutions were directly obtained from the coupled nonlinear Schrodinger equations. The transmission characteristics of first-order solitons obtained by the analytical procedure agree well with the results from numerical analysis. Taking into account the length of the coupler and the critical power a comparative study between this geometry and planar geometries were done. The triangular geometry has a shorter device length compared with planar geometries.","PeriodicalId":205350,"journal":{"name":"ITS'98 Proceedings. SBT/IEEE International Telecommunications Symposium (Cat. No.98EX202)","volume":"83 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121968593","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
Compressing images using edges and textures separately 分别使用边缘和纹理压缩图像
ITS'98 Proceedings. SBT/IEEE International Telecommunications Symposium (Cat. No.98EX202) Pub Date : 1998-08-09 DOI: 10.1109/ITS.1998.718459
S. R. Neves, G. Mendonça
{"title":"Compressing images using edges and textures separately","authors":"S. R. Neves, G. Mendonça","doi":"10.1109/ITS.1998.718459","DOIUrl":"https://doi.org/10.1109/ITS.1998.718459","url":null,"abstract":"This paper presents an image compression technique that codifies edges and textures of a given image separately using the wavelet transform. The proposed method has been developed in order to improve a low bit-rate scheme for still images. This kind of approach produces image contours that are well-defined and are not destroyed by the compression process, which is what usually happens on most coding methods. Several test images have been coded with the proposed method and the results show that the reconstructed images have good performance in relation to their PSNR and, especially, in terms of visual perception.","PeriodicalId":205350,"journal":{"name":"ITS'98 Proceedings. SBT/IEEE International Telecommunications Symposium (Cat. No.98EX202)","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124771096","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
The absolute minimum and maximum value problem and the Renyi entropy of order /spl alpha/ 绝对极小值和最大值问题与阶/spl α /的Renyi熵
ITS'98 Proceedings. SBT/IEEE International Telecommunications Symposium (Cat. No.98EX202) Pub Date : 1998-08-09 DOI: 10.1109/ITS.1998.713124
M.S. Alencar, F.M. Assis
{"title":"The absolute minimum and maximum value problem and the Renyi entropy of order /spl alpha/","authors":"M.S. Alencar, F.M. Assis","doi":"10.1109/ITS.1998.713124","DOIUrl":"https://doi.org/10.1109/ITS.1998.713124","url":null,"abstract":"The Renyi entropy of order /spl alpha/ can provide information on the minimum and maximum values of a probability distribution p=min{p/sub 1/,p/sub 2/,...,p/sub N/} and p=max(p/sub 1/,p/sub 2/,...,p/sub N/). The absolute minimum valve of a given probability distribution is shown to be related to the limit of the Renyi entropy, as /spl alpha//spl rarr/-/spl infin/, or p=2/sup -lim/spl alpha//spl rarr/-/spl infin/H/spl alpha/(P)/. The absolute maximum valve is given by p=2/sup -lim/spl alpha//spl rarr//spl infin/H/spl alpha/(P)/.","PeriodicalId":205350,"journal":{"name":"ITS'98 Proceedings. SBT/IEEE International Telecommunications Symposium (Cat. No.98EX202)","volume":"139 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122123753","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
Voice packet interarrival jitter over IP switching IP交换时语音包到达间抖动
ITS'98 Proceedings. SBT/IEEE International Telecommunications Symposium (Cat. No.98EX202) Pub Date : 1998-08-09 DOI: 10.1109/ITS.1998.713084
T. Yletyinen, R. Kantola
{"title":"Voice packet interarrival jitter over IP switching","authors":"T. Yletyinen, R. Kantola","doi":"10.1109/ITS.1998.713084","DOIUrl":"https://doi.org/10.1109/ITS.1998.713084","url":null,"abstract":"We measure the difference in packet spacing of voice packets at the receiver compared to that at the sender. The difference, interarrival jitter is used as a measure of the quality for real-time voice applications. Our focus is on comparison of Internet protocol (IP) store and forward and IP switching, a new technology with the purpose of speeding routing. For reference we also compare the difference to overall delay characteristics. We find out that the difference is small compared to end-to end delay and to sampling time and comparable to network delay. We show that, with the interarrival difference measure, IP switching is better suited for real-time traffic than conventional routing.","PeriodicalId":205350,"journal":{"name":"ITS'98 Proceedings. SBT/IEEE International Telecommunications Symposium (Cat. No.98EX202)","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123599001","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
Wideband CDMA simulator 宽带CDMA模拟器
ITS'98 Proceedings. SBT/IEEE International Telecommunications Symposium (Cat. No.98EX202) Pub Date : 1998-08-09 DOI: 10.1109/ITS.1998.713139
A. Shinoda, R. Kohno
{"title":"Wideband CDMA simulator","authors":"A. Shinoda, R. Kohno","doi":"10.1109/ITS.1998.713139","DOIUrl":"https://doi.org/10.1109/ITS.1998.713139","url":null,"abstract":"In this paper a wideband CDMA simulator is proposed. The uplink performance under multipath Rayleigh fading conditions is calculated by a simulator. The results indicate that the combination of various features like pilot symbol assisted (PSA)-channel estimator, RAKE finger, channel coding, antenna diversity, and transmit power control is effective in decreasing the required signal energy per information bit-to-interference (E/sub b//I/sub o/).","PeriodicalId":205350,"journal":{"name":"ITS'98 Proceedings. SBT/IEEE International Telecommunications Symposium (Cat. No.98EX202)","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131815757","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
Capacity loss of CDMA/PRMA protocol with imperfect power control loop for multimedia traffic 多媒体业务中功率控制环不完善的CDMA/PRMA协议的容量损失
ITS'98 Proceedings. SBT/IEEE International Telecommunications Symposium (Cat. No.98EX202) Pub Date : 1998-08-09 DOI: 10.1109/ITS.1998.713093
R. Hoefel, C. de Almeida
{"title":"Capacity loss of CDMA/PRMA protocol with imperfect power control loop for multimedia traffic","authors":"R. Hoefel, C. de Almeida","doi":"10.1109/ITS.1998.713093","DOIUrl":"https://doi.org/10.1109/ITS.1998.713093","url":null,"abstract":"This paper analyzes by simulation the capacity loss due to imperfections in the power control loop for the joint protocol CDMA/PRMA (Brand and Aghvami, 1996). It considers multimedia traffic for single and multiple cells with uniform traffic conditions.","PeriodicalId":205350,"journal":{"name":"ITS'98 Proceedings. SBT/IEEE International Telecommunications Symposium (Cat. No.98EX202)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122265744","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
Comparison of digital signal processing methods for sine wave signal generation 正弦波信号生成的数字信号处理方法比较
ITS'98 Proceedings. SBT/IEEE International Telecommunications Symposium (Cat. No.98EX202) Pub Date : 1998-08-09 DOI: 10.1109/ITS.1998.713134
V. Matic, V. Marinković-Nedelicki, V. Tadić
{"title":"Comparison of digital signal processing methods for sine wave signal generation","authors":"V. Matic, V. Marinković-Nedelicki, V. Tadić","doi":"10.1109/ITS.1998.713134","DOIUrl":"https://doi.org/10.1109/ITS.1998.713134","url":null,"abstract":"Sinusoidal signal generators represent an important part of communication systems, devices and applications. The implementation of integrated digital signal processing in signal generation provides fast and accurate calculations. This paper describes and compares three well-known algorithms for sine wave signal generation with an aim to identifying the algorithm most suitable for practical applications.","PeriodicalId":205350,"journal":{"name":"ITS'98 Proceedings. SBT/IEEE International Telecommunications Symposium (Cat. No.98EX202)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133964737","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: 10
首页 上一页 下一页 尾页
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整，为了账户安全，请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
请完成安全验证×
相关产品
×
本文献相关产品
联系我们：info@booksci.cn Book学术提供免费学术资源搜索服务，方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号：481959085
Book学术官方微信