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2014 International Telecommunications Symposium (ITS)最新文献

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Cooperative multiple-access scheme with antenna selection and incremental relaying 具有天线选择和增量中继的协同多址方案
2014 International Telecommunications Symposium (ITS) Pub Date : 2014-11-06 DOI: 10.1109/ITS.2014.6947984
Dimas Irion Alves, Renato B. Machado, Andrei Piccinini Legg, B. Uchôa-Filho
{"title":"Cooperative multiple-access scheme with antenna selection and incremental relaying","authors":"Dimas Irion Alves, Renato B. Machado, Andrei Piccinini Legg, B. Uchôa-Filho","doi":"10.1109/ITS.2014.6947984","DOIUrl":"https://doi.org/10.1109/ITS.2014.6947984","url":null,"abstract":"A cooperative multiple-access scheme for wireless communications systems with antenna selection and incremental relaying is proposed. The scheme aims to improve the system throughput while preserving good performance in terms of bit error rate. The system consists of N nodes which send their information to both the destination node and the multiple-antenna relay station. Based on the channel state information, the destination node decides whether or not relaying will be performed. When the relaying is performed, the decode-remodulate-and-forward protocol is used with the best antenna. Results reveal that the proposed scheme achieves a good tradeoff between throughput and bit error rate, which makes suitable to be considered for multi-user networks.","PeriodicalId":359348,"journal":{"name":"2014 International Telecommunications Symposium (ITS)","volume":"36 8-12 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":"131606980","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
Snapping shrimp noise reduction using convex optimization for underwater acoustic communication in warm shallow water 基于凸优化的暖浅水水声通信捕虾降噪研究
2014 International Telecommunications Symposium (ITS) Pub Date : 2014-11-06 DOI: 10.1109/ITS.2014.6948044
D. Guimarães, Lucas Silvestre Chaves, Rausley Adriano Amaral de Souza
{"title":"Snapping shrimp noise reduction using convex optimization for underwater acoustic communication in warm shallow water","authors":"D. Guimarães, Lucas Silvestre Chaves, Rausley Adriano Amaral de Souza","doi":"10.1109/ITS.2014.6948044","DOIUrl":"https://doi.org/10.1109/ITS.2014.6948044","url":null,"abstract":"We propose an ambient noise reduction technique for underwater acoustic communication systems in warm shallow water, where the snapping shrimp impulsive noise is a common impairment. This noise is emitted at the cavitation bubble collapse caused by the claw shut, and can produce very high acoustic pressures which are responsible for the impulsiveness of the noise. The denoised signal is the solution of an unconstrained scalarized bi-criterion convex optimization problem. One of the criterions is based on the robust least-squares signal reconstruction approach, for which the sum of the Huber penalty function of the residuals is minimized. The other criterion uses a quadratic smoothing regularization term, acting on the first-difference of the denoised signal samples. It is shown that the proposed technique can significantly reduce the ambient noise and, thus, reduce the bit error rate of an underwater digital communication system.","PeriodicalId":359348,"journal":{"name":"2014 International Telecommunications Symposium (ITS)","volume":"37 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":"126757810","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: 8
Optimum frequency-mismatch estimation for burst-mode coherent receivers 突发模相干接收机的最佳频率失配估计
2014 International Telecommunications Symposium (ITS) Pub Date : 2014-11-06 DOI: 10.1109/ITS.2014.6948028
Carlos E. C. Betancourth, Fábio Lumertz, D. Arantes
{"title":"Optimum frequency-mismatch estimation for burst-mode coherent receivers","authors":"Carlos E. C. Betancourth, Fábio Lumertz, D. Arantes","doi":"10.1109/ITS.2014.6948028","DOIUrl":"https://doi.org/10.1109/ITS.2014.6948028","url":null,"abstract":"Closed-form solutions are presented for frequency mismatch estimation in burst-mode coherent receivers. The expressions also apply to periodic pilot-signal bursts inserted into a continuous bit stream. The solutions are optimal in the mean-square-error sense for coherent optical receivers subject to random-walk phase fluctuations and high short-term laser-frequency stability. Low computational time-complexity of only O(n) and space-complexity as low as O(log(n)) are obtained, where n is the size of the estimation block. Better yet, when the pilot-signal is a Continuous Wave tone, the estimator is able to extend its performance up to the maximum correctable frequency-mismatch, which is one-half of the baud rate. We believe that these results contribute to fostering low-power transceiver technology for green communication networks.","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":"121083432","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
Performance of Fractional Fourier Transform for separation of chipless RFID collided signal 分数阶傅里叶变换在无芯片RFID碰撞信号分离中的性能
2014 International Telecommunications Symposium (ITS) Pub Date : 2014-11-06 DOI: 10.1109/ITS.2014.6948037
Camila D. R. Lopes, E. Gurjão, F. M. de Assis
{"title":"Performance of Fractional Fourier Transform for separation of chipless RFID collided signal","authors":"Camila D. R. Lopes, E. Gurjão, F. M. de Assis","doi":"10.1109/ITS.2014.6948037","DOIUrl":"https://doi.org/10.1109/ITS.2014.6948037","url":null,"abstract":"Chipless Radio Frequency Identification (RFID) systems were proposed to reduce the costs of RFID systems by using tags without a chip. The absence of a chip imposes the necessity of developing new techniques for information recovery from the reflected signal. In this paper we consider the application of the Fractional Fourier Transform - FrFT for the recovery of information in from collided signals. We show the feasibility of the method and the evaluation its performance when the number of collided tags increase. The results shows the robustness of the proposed method, even for a collision of a large number of tags.","PeriodicalId":359348,"journal":{"name":"2014 International Telecommunications Symposium (ITS)","volume":"5 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":"125195258","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
Exhaustive gaussian approach for performance evaluation of direct-detection OFDM systems employing square and cross QAM 采用方形和交叉QAM的直接检测OFDM系统性能评估的穷举高斯方法
2014 International Telecommunications Symposium (ITS) Pub Date : 2014-11-06 DOI: 10.1109/ITS.2014.6947998
Pedro E. D. Cruz, J. P. Rosário, T. Alves, A. Cartaxo
{"title":"Exhaustive gaussian approach for performance evaluation of direct-detection OFDM systems employing square and cross QAM","authors":"Pedro E. D. Cruz, J. P. Rosário, T. Alves, A. Cartaxo","doi":"10.1109/ITS.2014.6947998","DOIUrl":"https://doi.org/10.1109/ITS.2014.6947998","url":null,"abstract":"An exhaustive Gaussian approach (EGA) is proposed to evaluate, through numerical simulation, the bit error ratio (BER) of direct-detection orthogonal frequency-division multiplexing systems employing square and cross quadrature amplitude modulation. Excellent agreement between the BER estimates from the direct error counting (DEC) and the EGA is shown for different levels of optical signal-to-noise ratio and signal distortion. It is shown that the EGA requires about three orders of magnitude less in computation time than the DEC method for BER levels around 10-6, with the difference getting higher for lower BER levels.","PeriodicalId":359348,"journal":{"name":"2014 International Telecommunications Symposium (ITS)","volume":"30 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":"125238857","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: 8
Information-theoretic location verification system with directional antennas 定向天线信息论定位验证系统
2014 International Telecommunications Symposium (ITS) Pub Date : 2014-11-06 DOI: 10.1109/ITS.2014.6948010
Marcos Eduardo Pivaro Monteiro, J. L. Rebelatto, Richard Demo Souza
{"title":"Information-theoretic location verification system with directional antennas","authors":"Marcos Eduardo Pivaro Monteiro, J. L. Rebelatto, Richard Demo Souza","doi":"10.1109/ITS.2014.6948010","DOIUrl":"https://doi.org/10.1109/ITS.2014.6948010","url":null,"abstract":"In this work, we propose the use of directional antennas in a recently introduced information-theoretic location verification system (LVS) to improve its performance and reliability. Moreover, in the so-called LVS with directional antennas (LVS-DA), a realistic two-slope large scale fading model suitable to vehicular networks is considered. Numerical results show that the proposed LVS-DA scheme outperforms the original scheme, increasing the detection capability of malicious nodes in the system.","PeriodicalId":359348,"journal":{"name":"2014 International Telecommunications Symposium (ITS)","volume":"69 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":"114464168","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 volterra filtering approach for the polynomial formulation of the constant modulus criterion 恒模准则的多项式公式的volterra滤波方法
2014 International Telecommunications Symposium (ITS) Pub Date : 2014-11-06 DOI: 10.1109/ITS.2014.6947963
D. Fantinato, R. Attux, J. Romano, R. Suyama, A. Neves
{"title":"A volterra filtering approach for the polynomial formulation of the constant modulus criterion","authors":"D. Fantinato, R. Attux, J. Romano, R. Suyama, A. Neves","doi":"10.1109/ITS.2014.6947963","DOIUrl":"https://doi.org/10.1109/ITS.2014.6947963","url":null,"abstract":"In this work, an extended polynomial formulation of the constant modulus (CM) criterion under quadratic constraints is presented. Based on the method of Lagrange Multipliers, this `Volterra-CM formulation' brings very relevant information about the structure of the null-gradient CM solutions in the equalizer parameter space, including a conjecture regarding the relationship between the smallest multiplier and the optimal CM receiver. In the case of a two-tap filter, the proposed formulation allows that the solutions be obtained in terms of a single parameter, the corresponding Lagrange multiplier. For filters with more than two taps, the problem requires that a nonlinear system be solved, which is done with the aid of an iterative algorithm. The obtained global convergence rates show that the formulation is an effective tool to describe the structure of the optimal CM solution.","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":"123043516","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
Outage probability of dual-hop decode and forward MIMO relay with co-channel interference 具有同信道干扰的双跳解码和前向MIMO中继的中断概率
2014 International Telecommunications Symposium (ITS) Pub Date : 2014-11-06 DOI: 10.1109/ITS.2014.6948030
G. Pivaro, C. Ferreira Dias, G. Fraidenraich
{"title":"Outage probability of dual-hop decode and forward MIMO relay with co-channel interference","authors":"G. Pivaro, C. Ferreira Dias, G. Fraidenraich","doi":"10.1109/ITS.2014.6948030","DOIUrl":"https://doi.org/10.1109/ITS.2014.6948030","url":null,"abstract":"In this paper, the mutual information outage probability (P) for dual-hop decode-and-forward multiple-input multiple-output (MIMO) relay channel is obtained. Rayleigh distribution is used to model MIMO channels, and both full-duplex and half-duplex modes are investigated. Co-channel interference at relay and destination nodes has been considered. Our assumption is based on the result of [1], which establishes that MIMO channel mutual information can be well approximated by a Gaussian distribution. We have found a closed form expression for P given as a function of bivariate Gaussian cumulative density function. The results show for low-medium interference regime that full-duplex performs better than half-duplex mode. On the other hand, when relay self-interference increases, half-duplex outperforms full-duplex mode. Regarding the number of antennas, full-duplex mode performs better than half-duplex mode when number of antennas increases, even in high interference scenario. All the results are validated by numerical Monte Carlo simulations.","PeriodicalId":359348,"journal":{"name":"2014 International Telecommunications Symposium (ITS)","volume":"14 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":"122262292","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 blind beamforming algorithm for antenna arrays in cellular CDMA systems 蜂窝CDMA系统中天线阵列的盲波束形成算法
2014 International Telecommunications Symposium (ITS) Pub Date : 2014-11-06 DOI: 10.1109/ITS.2014.6947952
C. Pitz, Eduardo Luiz Ortiz Batista, R. Seara
{"title":"A blind beamforming algorithm for antenna arrays in cellular CDMA systems","authors":"C. Pitz, Eduardo Luiz Ortiz Batista, R. Seara","doi":"10.1109/ITS.2014.6947952","DOIUrl":"https://doi.org/10.1109/ITS.2014.6947952","url":null,"abstract":"This paper presents a new blind beamforming algorithm for antenna arrays of direct-sequence code-division multiple-access (DSSS-CDMA) systems. The aim of such an algorithm is to enhance the signal-to-interference-plus-noise ratio (SINR) of the received signal by using only the signals available at the CDMA correlators. In this context, a novel formulation for the optimization problem usually considered for developing this type of beamforming algorithm is first introduced. Then, the gradient method is used to solve such optimization problem in real time, resulting in the proposed beamforming algorithm. As compared with the other algorithms available in the open literature, the proposed one leads to a better tradeoff between the amplification of the signal of interest and attenuation of the interferences, which in turn improves the SINR of the received signal. Numerical simulation results are presented aiming to demonstrate the effectiveness of the proposed algorithm.","PeriodicalId":359348,"journal":{"name":"2014 International Telecommunications Symposium (ITS)","volume":"6 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":"125471509","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
A cooperative approach for dynamic spectrum access in radar bands 一种雷达波段动态频谱接入的合作方法
2014 International Telecommunications Symposium (ITS) Pub Date : 2014-11-06 DOI: 10.1109/ITS.2014.6947955
Carlos de Souza Lima, Francisco Paisana, J. Ferreira de Rezende, L. Dasilva
{"title":"A cooperative approach for dynamic spectrum access in radar bands","authors":"Carlos de Souza Lima, Francisco Paisana, J. Ferreira de Rezende, L. Dasilva","doi":"10.1109/ITS.2014.6947955","DOIUrl":"https://doi.org/10.1109/ITS.2014.6947955","url":null,"abstract":"The considerable amount of spectrum reserved for but underutilized by radar systems has motivated several regulatory bodies to make Dynamic Spectrum Access (DSA) in radar bands a reality. Taking into account the incumbents' very long ranges, one of the main issues of DSA in these bands is the aggregate interference, derived from multiple secondary users (SUs) operating in the same channel. In this paper, we assess the impact of this phenomenon when spectrum sharing is performed in a totally opportunistic manner, for instance, when Dynamic Frequency Selection (DFS) developed by the IEEE 802.11h standard is employed, and when there is a cooperation mechanism between radar systems and SUs. We considered the operating characteristics of a real C band meteorological radar system with acceptable levels of interference standardized by the International Telecommunication Union (ITU).","PeriodicalId":359348,"journal":{"name":"2014 International Telecommunications Symposium (ITS)","volume":"105 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":"124096700","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
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