发布求助
文献互助 智能选刊 最新文献

2007 National Radio Science Conference最新文献

筛选
英文 中文
Frequency Domain Approach for Blind Signal Separation of Convolutive Mixed Signals 卷积混合信号盲分离的频域方法
2007 National Radio Science Conference Pub Date : 2007-03-13 DOI: 10.1109/NRSC.2007.371366
U. Mohammad, M.F. Mahmomf
{"title":"Frequency Domain Approach for Blind Signal Separation of Convolutive Mixed Signals","authors":"U. Mohammad, M.F. Mahmomf","doi":"10.1109/NRSC.2007.371366","DOIUrl":"https://doi.org/10.1109/NRSC.2007.371366","url":null,"abstract":"In this paper a frequency domain approach to blind signal separation (BSS) of convolutive mixed signals is proposed. It is shown that iteratively minimizing the cost function such as the off-diagonal of the cross power spectral (CPS) matrices of the signals at the output of the mixing system is sufficient to identify the separating system at each frequency bin up to a scale and permutation ambiguity. The minimization of the cost function is performed using gradient-based optimization method. Then the inverse of the mixing system is estimated and used to separate the mixed sources. The performance of the proposed algorithm is demonstrated using a mixing of audio signals, BPSK signals, and image signals. The algorithm demonstrates good separation performance and enhanced output audio quality with fast convergence speed relative to the traditional methods.","PeriodicalId":177282,"journal":{"name":"2007 National Radio Science Conference","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115291957","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 Comparison between Clipping and μ-Law Companding Schemes for the Reduction of Peak-to-Average Power Ratio of OFDM 降低OFDM峰均功率比的裁剪与μ律扩展方案的比较
2007 National Radio Science Conference Pub Date : 2007-03-13 DOI: 10.1109/NRSC.2007.371384
S. A. Sulaiman, E. F. Badran, D. Mohamed
{"title":"A Comparison between Clipping and μ-Law Companding Schemes for the Reduction of Peak-to-Average Power Ratio of OFDM","authors":"S. A. Sulaiman, E. F. Badran, D. Mohamed","doi":"10.1109/NRSC.2007.371384","DOIUrl":"https://doi.org/10.1109/NRSC.2007.371384","url":null,"abstract":"Signal clipping and μ-law companding have been suggested as simple and effective peak-to- average power ratio (PAPR) reduction schemes for orthogonal frequency-division multiplexing (OFDM). This paper, addresses the problem of PAPR and the relation between it and the number of subcarriers, and analyzes clipped and companded M-ary phase-shift keying (M-PSK) OFDM signals. Their performance in AWGN channel with the presence of nonlinear power amplifier is evaluated and compared using computer simulation.","PeriodicalId":177282,"journal":{"name":"2007 National Radio Science Conference","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124824600","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: 12
Design of a Compact UWB Planar Antenna with Band-Notch Characterization 带陷波特性的小型UWB平面天线设计
2007 National Radio Science Conference Pub Date : 2007-03-13 DOI: 10.1109/NRSC.2007.371349
H. Zamel, A. Attiya, E. Hashish
{"title":"Design of a Compact UWB Planar Antenna with Band-Notch Characterization","authors":"H. Zamel, A. Attiya, E. Hashish","doi":"10.1109/NRSC.2007.371349","DOIUrl":"https://doi.org/10.1109/NRSC.2007.371349","url":null,"abstract":"A compact ultra-wideband (UWB) antenna with band-notch characteristic of size 28 mm times 29 mm is proposed. This antenna is designed to cover the Federal Communication Commission (FCC) bandwidth for UWB applications (3.1-10.6 GHz) and have a notch- filtering at the IEEE 802.1 Ia frequency band (5.15-5.825 GHz). This notch-filter effect is obtained by introducing a resonant U-shaped slot at this frequency. The design parameters and the performance of the proposed antenna are analyzed by using different techniques to assure the validity of the simulated results. Comparison between measurements and simulation is also presented.","PeriodicalId":177282,"journal":{"name":"2007 National Radio Science Conference","volume":"124 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128469132","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: 24
An Efficient Block-by-Block SVD-Based Image Watermarking Scheme 一种高效的逐块svd图像水印方案
2007 National Radio Science Conference Pub Date : 2007-03-13 DOI: 10.1109/NRSC.2007.371376
Rania A. Ghazy, N. El-Fishawy, M. Hadhoud, M. Dessouky, F. El-Samie
{"title":"An Efficient Block-by-Block SVD-Based Image Watermarking Scheme","authors":"Rania A. Ghazy, N. El-Fishawy, M. Hadhoud, M. Dessouky, F. El-Samie","doi":"10.1109/NRSC.2007.371376","DOIUrl":"https://doi.org/10.1109/NRSC.2007.371376","url":null,"abstract":"This paper presents a block based digital image watermarking that is dependent on the mathematical technique of singular value decomposition (SVD). Traditional SVD watermarking already exists for watermark embedding on the image as a whole. In the proposed approach, the original image is divided into blocks, and then the watermark is embedded in the singular values (SVs) of each block separately. This segmentation process and watermarking on a block-by-block basis makes the watermark more robust to the attacks such as noise, compression, cropping and other attacks as the results reveal. Watermark detection is implemented by extracting the watermark from the SVs of the watermarked blocks. Extracting the watermark from one block at least is enough to ensure the existence of the watermark.","PeriodicalId":177282,"journal":{"name":"2007 National Radio Science Conference","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114319965","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: 83
On Line Data and Voice Encryption System Based on FPGA Technology 基于FPGA技术的在线数据和语音加密系统
2007 National Radio Science Conference Pub Date : 2007-03-13 DOI: 10.1109/NRSC.2007.371402
I. Ashour
{"title":"On Line Data and Voice Encryption System Based on FPGA Technology","authors":"I. Ashour","doi":"10.1109/NRSC.2007.371402","DOIUrl":"https://doi.org/10.1109/NRSC.2007.371402","url":null,"abstract":"A secure, low cost and fast full-duplex on line data and voice encryption systems were designed implemented and tested. The design was based on FPGA technology using SAFER 64 (secure and fast encryption routine) algorithm. The FPGA was designed, simulated and synthesized using ISE and Mentor Graphics EDA tools. The overall system was tested successfully on public switch telephone networks (PSTN). The encryption with key generator, and system control modules was synthesized and implemented using low cost 200,000-gate Xilinx Spartan-3 XC3S200 FPGA.","PeriodicalId":177282,"journal":{"name":"2007 National Radio Science Conference","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125839276","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
Design and Implementation of a Robust System to Measure GSM Radiation using Microstrip Antenna on a Foam Substrate 泡沫基板上微带天线测量GSM辐射鲁棒系统的设计与实现
2007 National Radio Science Conference Pub Date : 2007-03-13 DOI: 10.1109/NRSC.2007.371392
T. Elshafiey, O. Hosny, J. Sirafim, R. Gamal
{"title":"Design and Implementation of a Robust System to Measure GSM Radiation using Microstrip Antenna on a Foam Substrate","authors":"T. Elshafiey, O. Hosny, J. Sirafim, R. Gamal","doi":"10.1109/NRSC.2007.371392","DOIUrl":"https://doi.org/10.1109/NRSC.2007.371392","url":null,"abstract":"This work presents design, analysis and implementation of a robust system to measure the power of the signal in the GSM range varying from 890 to 960 MHz. The system is composed of microstrip antenna on a foam substrate, RF detector, low pass filter, amplifier, analog to digital converter, and finally digital interface with a PC. As for the antenna, we designed and implemented microstrip antenna with bandwidth of 8% using foam as dielectric substrate. We used the system to measure the power of the signal in different places at different times during the day. Using the system we assured that the signal varies depending on the traffic at different hues and the location with respect to the base station.","PeriodicalId":177282,"journal":{"name":"2007 National Radio Science Conference","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132641170","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
Power Control in CDMA System using Particle Swarm Optimization 基于粒子群算法的CDMA系统功率控制
2007 National Radio Science Conference Pub Date : 2007-03-13 DOI: 10.1109/NRSC.2007.371393
H. Elkamchouchi, H.M. EIragal, M. Makar
{"title":"Power Control in CDMA System using Particle Swarm Optimization","authors":"H. Elkamchouchi, H.M. EIragal, M. Makar","doi":"10.1109/NRSC.2007.371393","DOIUrl":"https://doi.org/10.1109/NRSC.2007.371393","url":null,"abstract":"This paper presents a proposed algorithm for power control in CDMA system that is based on the powerful optimization technique known as particle swarm optimization (PSO). The algorithm finds a suitable power vector, i.e. the power levels that are determined in the base station and told to the mobile units so that if the mobile units adjust their transmitting levels to these power levels, they will fulfill the objectives of the power control problem. The proposed algorithm is based on a similar idea to the one presented in the paper by Moustafa et al (2000) and called 'genetic algorithm for mobiles equilibrium' (GAME). So, a detailed discussion of GAME is given then the proposed algorithm is presented. The application of the algorithm to the problem is investigated via testing the algorithm on a hypothetical CDMA network model. To illustrate its effectiveness, the proposed algorithm is then compared to the application of genetic algorithms (GA) to the same problem. Finally, a detailed example is studied considering a cell of 20 users that are allowed to update their positions and fading conditions.","PeriodicalId":177282,"journal":{"name":"2007 National Radio Science Conference","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117037916","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: 13
Performance Study For Color Filter Array Demosaicking Methods 彩色滤波阵列去马赛克方法的性能研究
2007 National Radio Science Conference Pub Date : 2007-03-13 DOI: 10.1109/NRSC.2007.371373
M. Hadhoud, M. Fouad, A. A. Hamdi
{"title":"Performance Study For Color Filter Array Demosaicking Methods","authors":"M. Hadhoud, M. Fouad, A. A. Hamdi","doi":"10.1109/NRSC.2007.371373","DOIUrl":"https://doi.org/10.1109/NRSC.2007.371373","url":null,"abstract":"Digital still cameras use a single electronic sensor overlaid with a color filter array (CFA) such that each sensor pixel only samples one of the three primary color values. To render a full-color image from the CFA samples, the two missing color values are estimated from its neighbors. This process is called CFA demosaicking. This paper introduces and compare between eight demosaicking methods using peak signal to noise ratio and mean square error in RGB color space and perceived error in CIELAB color space.","PeriodicalId":177282,"journal":{"name":"2007 National Radio Science Conference","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116024161","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
All Optical Broad-Band Multi-Raman Amplifier for Long-Haul UW-WDM Optical Communication Systems 远距离UW-WDM光通信系统全光宽带多拉曼放大器
2007 National Radio Science Conference Pub Date : 2007-03-13 DOI: 10.1109/NRSC.2007.371410
F. M. Mustafa, F. El-Halafawy, Moustafa H. Aly
{"title":"All Optical Broad-Band Multi-Raman Amplifier for Long-Haul UW-WDM Optical Communication Systems","authors":"F. M. Mustafa, F. El-Halafawy, Moustafa H. Aly","doi":"10.1109/NRSC.2007.371410","DOIUrl":"https://doi.org/10.1109/NRSC.2007.371410","url":null,"abstract":"In the present paper, the problem of multi-pumping all Raman amplifier has been investigated to obtain a gain of maximum flatness over a wide range of optical signal wavelengths for long-haul ultra-wide wavelength division multiplexing (UW-WDM) transmission systems. Four cases are analyzed where, four, five, and seven Raman pumping of special pumping powers are launched in the forward direction. The model equations are numerically handled and processed. The gain is computed over the spectral optical wavelengths (1.45 mum les lambdasignal les 1.65 mum).","PeriodicalId":177282,"journal":{"name":"2007 National Radio Science Conference","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126761476","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
Design and Analysis of Wideband Antenna with Application to Ground Penetrating Radar System 应用于探地雷达系统的宽带天线设计与分析
2007 National Radio Science Conference Pub Date : 2007-03-13 DOI: 10.1109/NRSC.2007.371353
G. Atteia, K. Hussein, A. Shaalan
{"title":"Design and Analysis of Wideband Antenna with Application to Ground Penetrating Radar System","authors":"G. Atteia, K. Hussein, A. Shaalan","doi":"10.1109/NRSC.2007.371353","DOIUrl":"https://doi.org/10.1109/NRSC.2007.371353","url":null,"abstract":"In this paper, a wide band antenna is proposed for ground-penetrating radar (GPR) system. This antenna consists of dipole antenna housed in a rectangular conducting reflector whose inner walls are coated by an absorbing material. The coating is composed of a number of layers with a conductivity profile designed to achieve the minimum voltage standing wave ratio (VSWR) of the dipole antenna over the frequency band of operation. The antenna impedance and VSWR are calculated using the finite-difference time-domain (FDTD) method. The antenna impedance and VSWR are presented over a wide-band of frequency. The capability of buried target detection by the proposed antenna is examined by investigating the coupling between the transmitting and receiving antennas in the presence and absence of buried targets. The operating bandwidth of the antenna is shown to be about 50%. The effect of the ground soil on the antenna characteristics is studied when the GPR system is placed at different heights above such a soil. The GPR system with the proposed antenna is shown to be capable of detecting the existence of buried targets.","PeriodicalId":177282,"journal":{"name":"2007 National Radio Science Conference","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124954633","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
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：604180095
Book学术官方微信