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2014 International Telecommunications Symposium (ITS)最新文献

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Impact of WSS delay distortion on the ROADM cascade performance in virtual carrier-assisted DD multi-band OFDM metro networks 虚拟载波辅助DD多频带OFDM城域网络中WSS时延失真对ROADM级联性能的影响
2014 International Telecommunications Symposium (ITS) Pub Date : 2014-11-06 DOI: 10.1109/ITS.2014.6948007
J. P. Rosário, T. Alves, A. Cartaxo
{"title":"Impact of WSS delay distortion on the ROADM cascade performance in virtual carrier-assisted DD multi-band OFDM metro networks","authors":"J. P. Rosário, T. Alves, A. Cartaxo","doi":"10.1109/ITS.2014.6948007","DOIUrl":"https://doi.org/10.1109/ITS.2014.6948007","url":null,"abstract":"The performance of a cascade of reconfigurable optical add/drop multiplexers (ROADM) in direct-detection multiband (MB) orthogonal frequency-division multiplexing (OFDM) virtual carrier-assisted metro networks is studied using numerical simulation. In particular, the impact of the delay distortion of the wavelength-selective switch (WSS) on the network performance is analysed and discussed. To this aim, an extension of a physical model of the WSS is proposed to predict the phase response of the WSS. The study is performed for 42.8 Gb/s single-side-band MB-OFDM systems comprising 3 or 4 OFDM bands and operating with 25 GHz channel spacing. Optimized parameters for a Gaussian and 2nd order super-Gaussian band-selector are used. It is shown that the delay distortion of typical WSSs has a negligible impact on the network performance. The reduction of the overall filtering passband of the ROADM cascade is identified as the main factor of performance degradation.","PeriodicalId":359348,"journal":{"name":"2014 International Telecommunications Symposium (ITS)","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127213678","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
Mitigation methods for FOPEN radar impact on wireless communications FOPEN雷达对无线通信影响的缓解方法
2014 International Telecommunications Symposium (ITS) Pub Date : 2014-11-06 DOI: 10.1109/ITS.2014.6948017
H. Hellsten, D. Svensson
{"title":"Mitigation methods for FOPEN radar impact on wireless communications","authors":"H. Hellsten, D. Svensson","doi":"10.1109/ITS.2014.6948017","DOIUrl":"https://doi.org/10.1109/ITS.2014.6948017","url":null,"abstract":"The paper provides methods for suppressing interference from ultra wide band FOPEN radar on communication signals within the FOPEN band. The paper accounts for theory, simulations and experiments concerning these methods. A foregoing analysis of the required radar emission thresholds, is provided in another paper, submitted to ITS 2014.","PeriodicalId":359348,"journal":{"name":"2014 International Telecommunications Symposium (ITS)","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134551412","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
Color image super-resolution based on Wiener filters 基于维纳滤波器的彩色图像超分辨率
2014 International Telecommunications Symposium (ITS) Pub Date : 2014-11-06 DOI: 10.1109/ITS.2014.6947980
Diego S. Wanderley, M. R. Petraglia, J. Gomes
{"title":"Color image super-resolution based on Wiener filters","authors":"Diego S. Wanderley, M. R. Petraglia, J. Gomes","doi":"10.1109/ITS.2014.6947980","DOIUrl":"https://doi.org/10.1109/ITS.2014.6947980","url":null,"abstract":"This work presents a study on color-image super-resolution algorithms based on adaptive Wiener filtering, which have low computational complexity in comparison to other image resolution enhancement methods. First, the monochrome super-resolution using Wiener filtering is applied to Wavelet Transform coefficients to mitigate the effects of random noise in the low resolution images. Then, the standard and Wavelet-domain super-resolution algorithms using Wiener filtering are applied to color channels to perform the color images super-resolution. A chrominance compression method is proposed to reduce the number of operations required for estimating the high resolution image.","PeriodicalId":359348,"journal":{"name":"2014 International Telecommunications Symposium (ITS)","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133180649","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
Fast H.264/AVC to HEVC transcoding based on machine learning 基于机器学习的H.264/AVC到HEVC快速转码
2014 International Telecommunications Symposium (ITS) Pub Date : 2014-11-06 DOI: 10.1109/ITS.2014.6947999
Eduardo Peixoto, B. Macchiavello, R. D. de Queiroz, E. Hung
{"title":"Fast H.264/AVC to HEVC transcoding based on machine learning","authors":"Eduardo Peixoto, B. Macchiavello, R. D. de Queiroz, E. Hung","doi":"10.1109/ITS.2014.6947999","DOIUrl":"https://doi.org/10.1109/ITS.2014.6947999","url":null,"abstract":"Since the HEVC codec has become an ITU-T and ISO/IEC standard, efficient transcoding from previous standards, such as the H.264/AVC, to HEVC is highly needed. In this paper, we build on our previous work with the goal to develop a faster transcoder from H.264/AVC to HEVC. The transcoder is built around an established two-stage transcoding. In the first stage, called the training stage, full re-encoding is performed while the H.264/AVC and the HEVC information are gathered. This information is then used to build a CU classification model that is used in the second stage (called the transcoding stage). The solution is tested with well-known video sequences and evaluated in terms of rate-distortion and complexity. The proposed method is 3.4 times faster, on average, than the trivial transcoder, and 1.65 times faster than a previous transcoding solution.","PeriodicalId":359348,"journal":{"name":"2014 International Telecommunications Symposium (ITS)","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121322312","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: 18
On the coded performance of precoded multicarrier systems using linear MMSE equalization 基于线性MMSE均衡的预编码多载波系统编码性能研究
2014 International Telecommunications Symposium (ITS) Pub Date : 2014-11-06 DOI: 10.1109/ITS.2014.6948025
B. Chang, C. D. da Rocha, D. Le Ruyet, D. Roviras
{"title":"On the coded performance of precoded multicarrier systems using linear MMSE equalization","authors":"B. Chang, C. D. da Rocha, D. Le Ruyet, D. Roviras","doi":"10.1109/ITS.2014.6948025","DOIUrl":"https://doi.org/10.1109/ITS.2014.6948025","url":null,"abstract":"In this paper, we propose a new method to derive the coded performance of precoded multicarrier systems using linear MMSE equalization. As an approximation for the SINR of a precoded multicarrier system employing linear MMSE equalization, the lognormal distribution with the smallest Kullback-Leibler distance to the observed SINR distribution is used. With this approximation, an expression for the coded pairwise error probability of this system is given. The Bit Error Rate (BER) performances with analytical computations using the lognormal approximation are very close to Monte Carlo simulations for coded systems.","PeriodicalId":359348,"journal":{"name":"2014 International Telecommunications Symposium (ITS)","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122915098","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
AGC EDFA transient suppression algorithm assisted by cognitive neural network 认知神经网络辅助的AGC EDFA瞬态抑制算法
2014 International Telecommunications Symposium (ITS) Pub Date : 2014-11-06 DOI: 10.1109/ITS.2014.6947964
Heitor Carvalho, Israel J. G. Cassimiro, Francisco H. C. S. Filho, Juliano R. F. de Oliveira, A. Bordonalli
{"title":"AGC EDFA transient suppression algorithm assisted by cognitive neural network","authors":"Heitor Carvalho, Israel J. G. Cassimiro, Francisco H. C. S. Filho, Juliano R. F. de Oliveira, A. Bordonalli","doi":"10.1109/ITS.2014.6947964","DOIUrl":"https://doi.org/10.1109/ITS.2014.6947964","url":null,"abstract":"This work proposes an EDFA electronic automatic gain control (AGC) scheme assisted by a cognitive neural network algorithm, providing gain control with transient suppression for potentially any EDFA operation point (input/output power condition) within a DWDM dynamic optical network. The idea is to use the neural network to estimate pump power levels and speed up the AGC proportional integral gain controller convergence. For experimental testing, the algorithm was embedded in a microprocessor inside an EDFA module, which was then placed in a fully-loaded reconfigurable DWDM optical link (80 × 112 Gbits/s DP-QPSK channels). By assuming a central point in the controller power mask, results show that gain control is kept below 2 dB for a giving surviving channel, with strong transient suppression during add/drop of 79 out of 80 channels (19 dB input power variation), leading to minimum undershoot/overshoot below 3.1 dB.","PeriodicalId":359348,"journal":{"name":"2014 International Telecommunications Symposium (ITS)","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126151216","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
An MSE-based theoretical limit to the performance of linear source extraction and equalization methods in undermodeled scenarios 基于mse的未建模情景下线性源提取和均衡方法性能的理论限制
2014 International Telecommunications Symposium (ITS) Pub Date : 2014-11-06 DOI: 10.1109/ITS.2014.6947970
Everton Z. Nadalin, R. Attux, J. Romano, L. Duarte, R. Suyama
{"title":"An MSE-based theoretical limit to the performance of linear source extraction and equalization methods in undermodeled scenarios","authors":"Everton Z. Nadalin, R. Attux, J. Romano, L. Duarte, R. Suyama","doi":"10.1109/ITS.2014.6947970","DOIUrl":"https://doi.org/10.1109/ITS.2014.6947970","url":null,"abstract":"This paper presents a simple and, to a certain extent, surprising result for Source Separation in an underdetermined scenario: without loss of generality, under the restriction that all sources have unit power, the sum of the residual mean-squared errors (MMSE) obtained after the estimation of all the sources is given by the difference between the number of sources and the number of sensors. This result can be extended to the case of single-input single-output (SISO) equalization, in which the obtained limit depends on the relationship between the length of the channel and equalizer impulse responses.","PeriodicalId":359348,"journal":{"name":"2014 International Telecommunications Symposium (ITS)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128407720","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
Reduced-cost combination of adaptive filters for acoustic echo cancellation 用于回声消除的低成本自适应滤波器组合
2014 International Telecommunications Symposium (ITS) Pub Date : 2014-11-06 DOI: 10.1109/ITS.2014.6948042
L. A. Azpicueta-Ruiz, J. Arenas-García, V. Nascimento, Magno T. M. Silva
{"title":"Reduced-cost combination of adaptive filters for acoustic echo cancellation","authors":"L. A. Azpicueta-Ruiz, J. Arenas-García, V. Nascimento, Magno T. M. Silva","doi":"10.1109/ITS.2014.6948042","DOIUrl":"https://doi.org/10.1109/ITS.2014.6948042","url":null,"abstract":"Adaptive combination of adaptive filters is an attractive approach that improves the performance attainable with individual filters. However, the computational cost associated with the operation of several filters in parallel could be unaffordable for some applications. In this paper, we propose a scheme with reduced computational cost for a combination of two adaptive filters with different step sizes, working in scenarios with a low signal-to-noise ratio and where the energy of the unknown system is concentrated at short delays. For this case, we propose to reduce the length of the fast filter, speeding up the convergence of the combination at the cost of a slight degradation on the steady-state error. We study and evaluate the performance of the combined scheme considering the length of the fast filter as a parameter. In addition, we discuss a possible application of this scheme in real-world acoustic echo cancellation for hands-free systems in cars.","PeriodicalId":359348,"journal":{"name":"2014 International Telecommunications Symposium (ITS)","volume":"87 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125640598","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
Effectiveness analysis of audio watermark tags for IPTV second screen applications and synchronization 音频水印标签在IPTV第二屏应用及同步中的有效性分析
2014 International Telecommunications Symposium (ITS) Pub Date : 2014-11-06 DOI: 10.1109/ITS.2014.6947989
G. M. Calixto, A. Angeluci, C. Kurashima, R. de Deus Lopes, M. Zuffo
{"title":"Effectiveness analysis of audio watermark tags for IPTV second screen applications and synchronization","authors":"G. M. Calixto, A. Angeluci, C. Kurashima, R. de Deus Lopes, M. Zuffo","doi":"10.1109/ITS.2014.6947989","DOIUrl":"https://doi.org/10.1109/ITS.2014.6947989","url":null,"abstract":"Recently, the industry and the research community have been exploring the use of more than one screen for the experience of interactivity with media content, primarily involving the TV. The techniques directly related with audio for second screen synchronization - the sound detection using the audio fingerprint technique - are well established. Experiments using audio watermark might reveal good solutions but are not fully explored in the literature. The aim of this paper is to evaluate and compare the transmission and receiving effectiveness of audio in the IPTV context. An analysis is carried out from laboratory trials using a second screen application with the function of detecting audio watermarks through different audio transmission and reception equipments. The results show that audio watermark can be transmitted over IPTV networks and also improve the interactive media usage scenarios.","PeriodicalId":359348,"journal":{"name":"2014 International Telecommunications Symposium (ITS)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130500650","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
Measurements in vegetation and modeling of a radio mobile channel in an urban park 城市公园中植被的测量和无线电移动信道的建模
2014 International Telecommunications Symposium (ITS) Pub Date : 2014-11-06 DOI: 10.1109/ITS.2014.6948014
B. R. S. Mello, P. Pinna, M. Dias, F. J. B. Fonseca, L. Matos
{"title":"Measurements in vegetation and modeling of a radio mobile channel in an urban park","authors":"B. R. S. Mello, P. Pinna, M. Dias, F. J. B. Fonseca, L. Matos","doi":"10.1109/ITS.2014.6948014","DOIUrl":"https://doi.org/10.1109/ITS.2014.6948014","url":null,"abstract":"This paper presents an empirical modeling for the radio mobile signal propagation in an urban park environment obtained from measurements made at the Botanic Gardens of Fonseca, Niterói, Rio de Janeiro, Brazil, using the frequencies of 900 MHz and 2400 MHz, with two different transmitting antenna heights, 3 and 5 meters, and receiving antennas fixed at the top of a car, with 1.5 meters height. Data were acquired from two different routes and, after processing, the signal coverage in this area was studied and a single propagation model was suggested. Comparisons are made with some other worthy empirical propagation models for vegetated areas and the proposed model is applied in another urban park presenting good agreement with the measurements.","PeriodicalId":359348,"journal":{"name":"2014 International Telecommunications Symposium (ITS)","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131337717","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
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