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Proceedings of the Fifteenth National Radio Science Conference. NRSC '98 (Cat. No.98EX109)最新文献

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Analysis of intrinsic small signal parameters in HEMTs hemt内禀小信号参数分析
Proceedings of the Fifteenth National Radio Science Conference. NRSC '98 (Cat. No.98EX109) Pub Date : 1998-02-24 DOI: 10.1109/NRSC.1998.711504
M. Abdel Aziz, M. E. Banna, M. Elsayed
{"title":"Analysis of intrinsic small signal parameters in HEMTs","authors":"M. Abdel Aziz, M. E. Banna, M. Elsayed","doi":"10.1109/NRSC.1998.711504","DOIUrl":"https://doi.org/10.1109/NRSC.1998.711504","url":null,"abstract":"A charge control model was developed which is based on a single analytical function that describes the dependence of the three charges in HEMTs on gate voltage. These charges include: 2DEG, AlGaAs free electrons and neutralized donors. Closed form expressions for the intrinsic small signal model parameters in linear and saturation regions were derived. The contributions of both the AlGaAs and neutralized donor charges, which were commonly ignored in early models, were studied at different gate and drain bias voltages.","PeriodicalId":128355,"journal":{"name":"Proceedings of the Fifteenth National Radio Science Conference. NRSC '98 (Cat. No.98EX109)","volume":"71 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114677529","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
Generation of m-sequence using Microchip PIC16C84 用PIC16C84芯片生成m序列
Proceedings of the Fifteenth National Radio Science Conference. NRSC '98 (Cat. No.98EX109) Pub Date : 1998-02-24 DOI: 10.1109/NRSC.1998.711466
M. Rizk, M.H. Eltelety
{"title":"Generation of m-sequence using Microchip PIC16C84","authors":"M. Rizk, M.H. Eltelety","doi":"10.1109/NRSC.1998.711466","DOIUrl":"https://doi.org/10.1109/NRSC.1998.711466","url":null,"abstract":"A simple circuit is described to generate m-sequence code up to 255 bit using a PIC microcontroller from Microchip. The circuit developed is found quite easy and useful for laboratory demonstrations. The PIC16C84 microcontroller from the Mid-Range family is used because it is the only one supported with an EEPROM, thus it is easily reprogrammable, even when installed in a system.","PeriodicalId":128355,"journal":{"name":"Proceedings of the Fifteenth National Radio Science Conference. NRSC '98 (Cat. No.98EX109)","volume":"84 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127282993","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 analysis of synchronous DS-CDMA in mobile nonlinear satellite channel 移动非线性卫星信道中同步DS-CDMA的性能分析
Proceedings of the Fifteenth National Radio Science Conference. NRSC '98 (Cat. No.98EX109) Pub Date : 1998-02-24 DOI: 10.1109/NRSC.1998.711473
M. Mayhoub, R. El Zanfally, H. El Hennawy, S. Mahrous
{"title":"Performance analysis of synchronous DS-CDMA in mobile nonlinear satellite channel","authors":"M. Mayhoub, R. El Zanfally, H. El Hennawy, S. Mahrous","doi":"10.1109/NRSC.1998.711473","DOIUrl":"https://doi.org/10.1109/NRSC.1998.711473","url":null,"abstract":"Trends in digital communications are opening up commercial applications to code division multiple access (CDMA). The paper presents an analytical model for the effects of nonlinearities and mobile channel on the performance of synchronous QPSK code division multiple-access (CDMA) systems. The combined effect of both the travelling wave tube (TWT) power amplifier exhibiting AM-to-AM and AM-to-PM conversion, down-link thermal noise and the multipath fading mobile channel are taken into consideration in the analysis. System performance in terms of the error probability is explored.","PeriodicalId":128355,"journal":{"name":"Proceedings of the Fifteenth National Radio Science Conference. NRSC '98 (Cat. No.98EX109)","volume":"290 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133660286","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
Reservation-based multiple access protocols for mixed-media mobile radio networks 混合媒体移动无线网络中基于预约的多址协议
Proceedings of the Fifteenth National Radio Science Conference. NRSC '98 (Cat. No.98EX109) Pub Date : 1998-02-24 DOI: 10.1109/NRSC.1998.711475
M. Nofal, Mona Shokair, M. Nassar, F. El-Halafawy
{"title":"Reservation-based multiple access protocols for mixed-media mobile radio networks","authors":"M. Nofal, Mona Shokair, M. Nassar, F. El-Halafawy","doi":"10.1109/NRSC.1998.711475","DOIUrl":"https://doi.org/10.1109/NRSC.1998.711475","url":null,"abstract":"The performance of some reservation-based multiple access protocols for mixed-media mobile radio networks is investigated. We emphasize the improvement achieved in network capacity and spectral efficiency of the mobile radio networks through the statistical multiplexing of information sources. We investigate the basic packet reservation multiple access (PRMA) protocol when supporting voice service and when providing integrated (voice/data) mixed-media services. The deficiency of such protocols is addressed and a refinement is suggested; namely, packet reservation multiple access with reservation subframe protocol. The operational mechanisms and inherent features of the reservation protocols are addressed as well as their advantages and deficiencies. Numerical results are presented and discussed.","PeriodicalId":128355,"journal":{"name":"Proceedings of the Fifteenth National Radio Science Conference. NRSC '98 (Cat. No.98EX109)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132164711","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
Novel derivation for the polynomial optimal control methods. 2. GLQG controller design 多项式最优控制方法的新推导。2. GLQG控制器设计
Proceedings of the Fifteenth National Radio Science Conference. NRSC '98 (Cat. No.98EX109) Pub Date : 1998-02-24 DOI: 10.1109/NRSC.1998.711465
G. El-Sheikh
{"title":"Novel derivation for the polynomial optimal control methods. 2. GLQG controller design","authors":"G. El-Sheikh","doi":"10.1109/NRSC.1998.711465","DOIUrl":"https://doi.org/10.1109/NRSC.1998.711465","url":null,"abstract":"This paper presents a novel derivation for the problem of polynomial generalized-linear-quadratic-gaussian (GLQG) control following a systematic approach for the derivation and considering a more general plant-structure that contains colored input disturbance and measurement noise. The presentation of the theory comes in a more concise, clear and general form to help those looking to use it without any details as well as those looking for detailed understanding and tailoring the theory to their problems. The cost function includes dynamic weighting elements allowing integral action to be introduced and robustness characteristics to be modified. Thus, the novelty of the paper stems from the fact that it presents the proof in a novel approach for a general plant structure which covers and could be broken down easily to any special case that might exist in reality. The paper is supplemented with design steps and two numerical examples: one is a continuous time system and the other is a discrete time system.","PeriodicalId":128355,"journal":{"name":"Proceedings of the Fifteenth National Radio Science Conference. NRSC '98 (Cat. No.98EX109)","volume":"161 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132190010","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 robust iterative scheme for FEM applications terminated by the perfectly matched layer (PML) absorbers 以完全匹配层(PML)吸收器终止的有限元应用的鲁棒迭代方案
Proceedings of the Fifteenth National Radio Science Conference. NRSC '98 (Cat. No.98EX109) Pub Date : 1998-02-24 DOI: 10.1109/NRSC.1998.711512
Y. Botros, J. Volakis
{"title":"A robust iterative scheme for FEM applications terminated by the perfectly matched layer (PML) absorbers","authors":"Y. Botros, J. Volakis","doi":"10.1109/NRSC.1998.711512","DOIUrl":"https://doi.org/10.1109/NRSC.1998.711512","url":null,"abstract":"Because of their superior absorption characteristics, the Perfectly Matched Layer (PML) absorbers are used in truncating finite element domains. However, their implementation is equivalent to imposing active elements inside the main mesh. Consequently, the condition number of the resulting systems deteriorates. In this work, an efficient preconditioned generalized minimal residual (GMRES) iterative solver is developed and applied to systems truncated by PML absorbers. This iterative scheme is implemented and tested for different cases representing actual microwave circuit structures.","PeriodicalId":128355,"journal":{"name":"Proceedings of the Fifteenth National Radio Science Conference. NRSC '98 (Cat. No.98EX109)","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114085060","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
Wide-range portable dosimeter based on microcontroller 基于单片机的便携式大量程剂量计
Proceedings of the Fifteenth National Radio Science Conference. NRSC '98 (Cat. No.98EX109) Pub Date : 1998-02-24 DOI: 10.1109/NRSC.1998.711524
I. Mahmoud
{"title":"Wide-range portable dosimeter based on microcontroller","authors":"I. Mahmoud","doi":"10.1109/NRSC.1998.711524","DOIUrl":"https://doi.org/10.1109/NRSC.1998.711524","url":null,"abstract":"In this paper, a technique for wide-range radiation measurement and analysis suitable for portable instruments, has been presented. Instead of expensive analog devices and ionization chamber detectors, a microcontroller and a Geiger-Muller tube (GM) are employed to implement this instrument. The nonlinear counting rate/dose rate curves of GM tubes are fitted into quadratic or 3/sup rd/ order polynomial equations that are solved using the microcontroller. A measurement program that uses the capabilities of CMOS microcontrollers for power saving is presented. The integrated dose, dose rate, and battery check functions are implemented. By obtaining the equation of a GM tube, we can extend the dose rate range beyond the linear portion of its curve. Very low power consumption and flexibility of the programmed devices in conjunction with enhanced functionality compared with top class analog instruments makes the proposed technique an excellent choice for wide-range portable dosimeter instruments.","PeriodicalId":128355,"journal":{"name":"Proceedings of the Fifteenth National Radio Science Conference. NRSC '98 (Cat. No.98EX109)","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114755814","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
Implementation of logic circuits using a novel design of a reconfigurable feedforward artificial neural network approach 逻辑电路的实现采用一种新颖的可重构前馈人工神经网络方法
Proceedings of the Fifteenth National Radio Science Conference. NRSC '98 (Cat. No.98EX109) Pub Date : 1998-02-24 DOI: 10.1109/NRSC.1998.711493
M. Morsi, M.A. Abo El-Soud, N.M. Salama
{"title":"Implementation of logic circuits using a novel design of a reconfigurable feedforward artificial neural network approach","authors":"M. Morsi, M.A. Abo El-Soud, N.M. Salama","doi":"10.1109/NRSC.1998.711493","DOIUrl":"https://doi.org/10.1109/NRSC.1998.711493","url":null,"abstract":"No doubt the digital design and implementation of any logic circuit suffer much from the difficulty. On the other hand, the analog design and realization of analog devices have advantages of both economy and easy to implement compared with the digital design. In the present work, we adopted the reconfigurable artificial neural network approach for the of the 7 traditional logic functions in both the bit- and word-level. A new design for XOR and XNOR logic functions have been proposed using this approach. Comparison between the proposed and traditional networks shows that, the proposed network has a minimum number of neurons and synaptic weights. The proposed neural network for bit-level has been realized by a hardware means and the result have been checked using Pspice computer program. Both the actual and computer results are found to be very close to the correct results.","PeriodicalId":128355,"journal":{"name":"Proceedings of the Fifteenth National Radio Science Conference. NRSC '98 (Cat. No.98EX109)","volume":"60 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132287778","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
Hybrid implementation of neural nets using switched resistor technique 基于开关电阻技术的神经网络混合实现
Proceedings of the Fifteenth National Radio Science Conference. NRSC '98 (Cat. No.98EX109) Pub Date : 1998-02-24 DOI: 10.1109/NRSC.1998.711492
H. El-Bakry, M. Abo-Elsoud
{"title":"Hybrid implementation of neural nets using switched resistor technique","authors":"H. El-Bakry, M. Abo-Elsoud","doi":"10.1109/NRSC.1998.711492","DOIUrl":"https://doi.org/10.1109/NRSC.1998.711492","url":null,"abstract":"A simple hybrid implementation technique for realizing ANNs is presented. The technique is used for realizing a network of two layers in order to make a classification between two characters T and C independent of position, rotation, and scaling. The programmability of adaptive CMOS synaptic weights is achieved by employing the switched resistor (SR) technique. Due to the exponential nature of the bipolar transistors, the sigmoid function is represented by using bipolar transistors. So, the proposed neuron is fully compatible with BiCMOS technology. This implementation technique can be used for different applications.","PeriodicalId":128355,"journal":{"name":"Proceedings of the Fifteenth National Radio Science Conference. NRSC '98 (Cat. No.98EX109)","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116554429","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
Analytical results on adaptive equalization performance in multipath time-varying fading channels 多径时变衰落信道自适应均衡性能分析结果
Proceedings of the Fifteenth National Radio Science Conference. NRSC '98 (Cat. No.98EX109) Pub Date : 1998-02-24 DOI: 10.1109/NRSC.1998.711491
S. El-Agooz
{"title":"Analytical results on adaptive equalization performance in multipath time-varying fading channels","authors":"S. El-Agooz","doi":"10.1109/NRSC.1998.711491","DOIUrl":"https://doi.org/10.1109/NRSC.1998.711491","url":null,"abstract":"A closed form formula is derived for the average mean-square-error (AMSE) over the time division multiple access (TDMA) user's slot at the output of a LE-LMS (linear equalizer that uses the least mean square algorithm for adaptation). This formula for the AMSE can be used to examine the effect of system parameters on the equalizer performance, the result of which provides the opportunity to make initial evaluations of important system design decisions. In addition, this formula can be used to compare the AMSE and/or the performance of different system models having different channel variation models and/or different multipath profile shapes. The conclusions that are extracted from applying this formula can be applied also for the decision feedback and fractionally spaced equalizers. Also, the calculated and simulated AMSE are compared. Furthermore, examples of this formula's applications are demonstrated.","PeriodicalId":128355,"journal":{"name":"Proceedings of the Fifteenth National Radio Science Conference. NRSC '98 (Cat. No.98EX109)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127463002","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
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