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2007 National Radio Science Conference最新文献

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Design and Modeling of a Linear Array of Longitudinal Slots on Substrate Integrated Waveguide 基板集成波导纵向槽线性阵列的设计与建模
2007 National Radio Science Conference Pub Date : 2007-03-13 DOI: 10.1109/NRSC.2007.371340
M. Rashid, A. Sebak
{"title":"Design and Modeling of a Linear Array of Longitudinal Slots on Substrate Integrated Waveguide","authors":"M. Rashid, A. Sebak","doi":"10.1109/NRSC.2007.371340","DOIUrl":"https://doi.org/10.1109/NRSC.2007.371340","url":null,"abstract":"In SIW structures, side walls are substituted by metal vias and plated holes. In this paper, we present a SIW slot array antenna, which is fed by a corporate type of microstrip power divider. The slot array and the feeding network can be fabricated on a single substrate. As a result, not only the size, weight and cost of the waveguide slot array antennas are reduced, but also the manufacturing repeatability and reliability are enhanced. Meanwhile the gain and efficiency of those antennas have only a little depression because of the dielectric loss.","PeriodicalId":177282,"journal":{"name":"2007 National Radio Science Conference","volume":"19 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":"122890665","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: 6
Image Enhancement Using a Contrast measure in the Discrete Wavelet Transform 基于离散小波变换对比度的图像增强
2007 National Radio Science Conference Pub Date : 2007-03-13 DOI: 10.1109/NRSC.2007.371369
A. Abdelwahab, M.K. Ahmed, S. Hashem
{"title":"Image Enhancement Using a Contrast measure in the Discrete Wavelet Transform","authors":"A. Abdelwahab, M.K. Ahmed, S. Hashem","doi":"10.1109/NRSC.2007.371369","DOIUrl":"https://doi.org/10.1109/NRSC.2007.371369","url":null,"abstract":"In this paper, a new image enhancement technique based on a proposed contrast measure in the discrete wavelet transform is proposed. The contrast measure is defined as the ratio of high spatial-frequency content and low spatial-frequency content in the subbands of the discrete wavelet transform matrix. The obtained enhanced images from the proposed technique have better visual quality when compared with previous discrete cosine transform- based enhancement technique.","PeriodicalId":177282,"journal":{"name":"2007 National Radio Science Conference","volume":"65 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":"123510415","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
Error Rate Performance of MC DS-CDMA System With Multiple Receive Antennas in Nakagami-m Fading Channel Nakagami-m衰落信道中多接收天线MC DS-CDMA系统的误码率性能
2007 National Radio Science Conference Pub Date : 2007-03-13 DOI: 10.1109/NRSC.2007.371386
A. Hashem, S. Elnoubi, H. Elmikati
{"title":"Error Rate Performance of MC DS-CDMA System With Multiple Receive Antennas in Nakagami-m Fading Channel","authors":"A. Hashem, S. Elnoubi, H. Elmikati","doi":"10.1109/NRSC.2007.371386","DOIUrl":"https://doi.org/10.1109/NRSC.2007.371386","url":null,"abstract":"This paper studies the error rate performance of multi carrier direct sequence code division multiple access (MC DS-CDMA) system in conjunction with maximum ratio combining (MRC) over Nakagami-m multipath fading channel. Multiple receive antenna structure is employed at the receiver side to provide spatial diversity in addition to the frequency diversity offered by the MC system. A closed form one-fold integration, which could be solved numerically without the need for simulations, is derived for BER performance of the system. Furthermore, numerical analysis is conducted for different MC systems over different Nakagami-m channels. In addition, tradeoff analysis is provided among different types of diversities: space, frequency and path diversities.","PeriodicalId":177282,"journal":{"name":"2007 National Radio Science Conference","volume":"70 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":"126326697","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 Fast B_Spline Based Algorithm for Image Zooming and Compression 基于b样条的快速图像缩放和压缩算法
2007 National Radio Science Conference Pub Date : 2007-03-13 DOI: 10.1109/NRSC.2007.371372
M. Fahmy, Tariq Hameed, G. Fahmy
{"title":"A Fast B_Spline Based Algorithm for Image Zooming and Compression","authors":"M. Fahmy, Tariq Hameed, G. Fahmy","doi":"10.1109/NRSC.2007.371372","DOIUrl":"https://doi.org/10.1109/NRSC.2007.371372","url":null,"abstract":"An efficient non-real time method is proposed for evaluating the output of non-causal digital systems. This method is used for the evaluation of B_spline coefficients fitting a given data. Next, it is shown that using a decimated version of the signal or image under consideration, the number of these coefficients can be appreciably reduced and their values can be optimally chosen without any appreciable degradation of the reconstructed signal/image using these reduced number of coefficients. Applications to image zooming and compression are also suggested. Image compression is based on compressing these B_spline coefficients rather than the image itself. Illustrative examples are given, to verify the high quality of the reconstructed images when compared to other compression techniques.","PeriodicalId":177282,"journal":{"name":"2007 National Radio Science Conference","volume":"14 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":"126108055","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
New Factor for Judging the Quality of Speech Perceived from Artificial Reverberators 判断人工混响器语音质量的新因素
2007 National Radio Science Conference Pub Date : 2007-03-13 DOI: 10.1109/NRSC.2007.371375
Noha O. Korany
{"title":"New Factor for Judging the Quality of Speech Perceived from Artificial Reverberators","authors":"Noha O. Korany","doi":"10.1109/NRSC.2007.371375","DOIUrl":"https://doi.org/10.1109/NRSC.2007.371375","url":null,"abstract":"A new factor, the zero-crossing criterion, is introduced to judge the quality of the speech sounds from artificial reverberators. Artificial reverberators, such as comb filters, are used to simulate the acoustic impulse response of rooms, but comb filters produce audible colorations and flutter. In this article, several configurations for reverberation filters are presented, the zero-crossing criterion is calculated for the impulse response of each and the results are discussed.","PeriodicalId":177282,"journal":{"name":"2007 National Radio Science Conference","volume":"75 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":"126196622","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
The FBG Stream Cipher FBG流密码
2007 National Radio Science Conference Pub Date : 2007-03-13 DOI: 10.1109/NRSC.2007.371365
S. E. El-Khamy, M. Lotfy, Adel Hamdi Ali
{"title":"The FBG Stream Cipher","authors":"S. E. El-Khamy, M. Lotfy, Adel Hamdi Ali","doi":"10.1109/NRSC.2007.371365","DOIUrl":"https://doi.org/10.1109/NRSC.2007.371365","url":null,"abstract":"In this paper we propose a new synchronous stream cipher; the FBG stream cipher. This cipher is based on FBG (fuzzy bit generator) PN bit generator. The FBG cipher has been designed to produce keystream with guaranteed randomness properties; i.e. passing all the 16 tests of the NIST statistical test suite. Also, it gave very good results when tested using the ENT randomness test program. In addition, it has good correlation properties. The FBG stream cipher is on the form of a non-linear feedback shift register.","PeriodicalId":177282,"journal":{"name":"2007 National Radio Science Conference","volume":"24 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":"121781206","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
Performance Evaluation of Integrated Voice/Data Services Over GSM/EGPRS With Radio Resource Dimensioning 基于无线资源维度的GSM/EGPRS话音/数据综合业务性能评价
2007 National Radio Science Conference Pub Date : 2006-11-01 DOI: 10.1109/NRSC.2007.371387
N. El-Fishawy, H. Ahmed, M. Dessouky, N. Ramadan
{"title":"Performance Evaluation of Integrated Voice/Data Services Over GSM/EGPRS With Radio Resource Dimensioning","authors":"N. El-Fishawy, H. Ahmed, M. Dessouky, N. Ramadan","doi":"10.1109/NRSC.2007.371387","DOIUrl":"https://doi.org/10.1109/NRSC.2007.371387","url":null,"abstract":"In this paper an analytical model for GSM/EGPRS is developed. It is based on the performance of M/M/C/co/N queueing system with FCFS queue discipline. This model is adapted to guarantee GPRS/EGPRS system constraint and Internet traffic (ON/OFF traffic) over a single cell. The interaction of voice calls with GPRS/EGPRS connections is studied. Different performance parameters are calculated which are blocking and delay probability, average throughput, average number of waiting users and queueing time. These performance parameters are obtained under different coding schemes (C-Sc) and three main radio resource strategies which are Complete Partitioning (CP), Partial Sharing (PS), and Complete Sharing (CS). The obtained results show that the (CP) strategy is better than the (PS) and (CS) strategies.","PeriodicalId":177282,"journal":{"name":"2007 National Radio Science Conference","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126051545","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
High-Speed, Area-Efficient FPGA-Based Floating-Point Arithmetic Modules 高速、高效率的基于fpga的浮点运算模块
2007 National Radio Science Conference Pub Date : 2006-07-01 DOI: 10.1109/NRSC.2007.371368
M. Taher, M. Aboulwafa, A. Abdelwahab, Elsayed M. Saad
{"title":"High-Speed, Area-Efficient FPGA-Based Floating-Point Arithmetic Modules","authors":"M. Taher, M. Aboulwafa, A. Abdelwahab, Elsayed M. Saad","doi":"10.1109/NRSC.2007.371368","DOIUrl":"https://doi.org/10.1109/NRSC.2007.371368","url":null,"abstract":"In this paper, single-precision floating-point IEEE-754 standard Adder/Subtractor and Multiplier modules with high speed and area efficient are presented. These modules are designed, simulated, synthesized and optimized by using Mentor Graphics Tools, and they are implemented on an FPGA based system by using the Xilinx Tool (ISE). A comparison between the results of the proposed design and a previously reported one is provided. The effect of normalization unit at the single-precision floating-point multiplier and adder/Subtractor modules on the area, and speed is explained. An FIR filter is implemented on FPGA as an application example.","PeriodicalId":177282,"journal":{"name":"2007 National Radio Science Conference","volume":"299 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123191170","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
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