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

Thermal-stress-induced birefringence in panda and bow-tie optical fibers 熊猫和领结光纤的热应力诱导双折射

Proceedings of the Fifteenth National Radio Science Conference. NRSC '98 (Cat. No.98EX109) Pub Date : 1998-02-24 DOI: 10.1109/NRSC.1998.711515

Moustafa H. Aly, M. Abouelwafa, M. M. Keshk

引用次数: 3

Study and characterization of a new MOSFET voltage controlled negative resistance for super selective IC tank circuits 用于超选择性IC槽电路的新型MOSFET压控负电阻的研究与表征

Proceedings of the Fifteenth National Radio Science Conference. NRSC '98 (Cat. No.98EX109) Pub Date : 1998-02-24 DOI: 10.1109/NRSC.1998.711502

A. El-Hennawy, K. Hassan, A. Ramadan Abou El-Ela, H. Abd El-Hameed

引用次数: 3

Analysis of circular cylindrical dielectric rod leaky wave antenna with periodic strips and TE circularly symmetric wave 周期条形圆柱介质杆漏波天线与TE圆对称波分析

Proceedings of the Fifteenth National Radio Science Conference. NRSC '98 (Cat. No.98EX109) Pub Date : 1998-02-24 DOI: 10.1109/NRSC.1998.711454

M.A. El-Muslimany, E. El-Diwany, H. El-Hennawy

引用次数: 1

A method for increasing GPS working area 一种增加GPS工作区域的方法

Proceedings of the Fifteenth National Radio Science Conference. NRSC '98 (Cat. No.98EX109) Pub Date : 1998-02-24 DOI: 10.1109/NRSC.1998.711470

H. Abdel-Wahab, A. M. Hamad, S.Y. El-Aesa

引用次数: 0

Performance of an enhanced multiplexer with imperfect access lines in an ATM network ATM网络中接入线路不完善的增强型多路复用器的性能

Proceedings of the Fifteenth National Radio Science Conference. NRSC '98 (Cat. No.98EX109) Pub Date : 1998-02-24 DOI: 10.1109/NRSC.1998.711498

H. Nassar, A. Meligy

{"title":"Performance of an enhanced multiplexer with imperfect access lines in an ATM network","authors":"H. Nassar, A. Meligy","doi":"10.1109/NRSC.1998.711498","DOIUrl":"https://doi.org/10.1109/NRSC.1998.711498","url":null,"abstract":"Multiplexers are used in communications networks to increase link efficiency. A multiplexer receives traffic from many sources on access lines and sends it to its destination on a trunk line. This technique results in a great savings when the traffic of the sources is bursty. A problem arises, however, if the access lines are imperfect, in the sense that they may introduce errors in the traffic they carry. A normal multiplexer unknowingly transmits the erroneous traffic to the destination. The destination, with the help of an error-detection routine, detects the errors and discards that traffic, but of course after it has wasted much needed bandwidth on the trunk. This paper proposes an enhanced multiplexer, which is just a normal multiplexer with an error-detection routine similar to that of the destination. The function of this routine is to discard the erroneous traffic right at the multiplexer, thus saving the bandwidth of the trunk for only the error-free traffic. A discrete queueing theoretic model is developed in this paper for the enhanced multiplexer. By analyzing the model, using the generating function approach, it is shown that the enhanced multiplexer is superior in performance to its normal counterpart. For conciseness, it is assumed that the multiplexer is hooked to an asynchronous transfer mode (ATM) network. However the model presented can be easily modified to suit other network standards.","PeriodicalId":128355,"journal":{"name":"Proceedings of the Fifteenth National Radio Science Conference. NRSC '98 (Cat. No.98EX109)","volume":"118 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":"132372211","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

High bit rate semiconductor laser lightwave transmission system 高比特率半导体激光光波传输系统

Proceedings of the Fifteenth National Radio Science Conference. NRSC '98 (Cat. No.98EX109) Pub Date : 1998-02-24 DOI: 10.1109/NRSC.1998.711513

M.S. Bayoumi

引用次数: 0

Detection & discrimination of covert DS/SS signals using triple correlation 基于三重相关的隐蔽DS/SS信号检测与判别

Proceedings of the Fifteenth National Radio Science Conference. NRSC '98 (Cat. No.98EX109) Pub Date : 1998-02-24 DOI: 10.1109/NRSC.1998.711496

M. Gouda, E. R. Adams, P. Hill

引用次数: 7

Environmental impact of nuclear materials as radiation source 作为辐射源的核材料对环境的影响

Proceedings of the Fifteenth National Radio Science Conference. NRSC '98 (Cat. No.98EX109) Pub Date : 1998-02-24 DOI: 10.1109/NRSC.1998.711522

I. Badawy

引用次数: 0

Complete characterization of corrugated elliptical horns for millimeter wave antennas 毫米波天线的波纹椭圆喇叭的完整特性

Proceedings of the Fifteenth National Radio Science Conference. NRSC '98 (Cat. No.98EX109) Pub Date : 1998-02-24 DOI: 10.1109/NRSC.1998.711441

E. Kuhn, A. Omar

引用次数: 1

Study and investigation of a new technique for adaptive cancellation of MOSFET op amp noise 一种自适应消除MOSFET运放噪声的新技术的研究

Proceedings of the Fifteenth National Radio Science Conference. NRSC '98 (Cat. No.98EX109) Pub Date : 1998-02-24 DOI: 10.1109/NRSC.1998.711506

A. El-Hennawy, S. Bayomi, S. Saafan

{"title":"Study and investigation of a new technique for adaptive cancellation of MOSFET op amp noise","authors":"A. El-Hennawy, S. Bayomi, S. Saafan","doi":"10.1109/NRSC.1998.711506","DOIUrl":"https://doi.org/10.1109/NRSC.1998.711506","url":null,"abstract":"The need for noise-free operational amplifiers for use in many precision applications has greatly increased recently. This paper presents a new technique for adaptive cancellation of noise in MOSFET IC operational amplifiers. It employs a new circuit configuration comprising two operational amplifiers having common current source, one is passive with its inverting and non inverting inputs short circuited. This operational amplifier is only responsible for amplifying its equivalent input noise and to give a proportional output voltage. The second operational amplifier is active and used to amplify the signal to be processed together with the operational amplifier equivalent input noise and gives a proportional output voltage. The two operational amplifiers are cross coupled to each other so that the noise of the passive amplifier is amplified and subtracted from the output of the second one and makes it, therefore noise free (/spl sim/0.22 nV//spl radic/(HZ) or 20 m Vrms within 2.5 kHz bandwidth over frequencies extending from very low frequency up to GHz), over a very wide dynamic range of input voltage (/spl sim/120 dB) and ambient temperature (/spl sim/0 to 50/spl deg/C). A feedback loop is added to improve the amplifier linearity (better than 2%). The standard submicron MOSFET technology (/spl sim/0.2 /spl mu/m to 2 /spl mu/m) is used for the realization of the proposed noise free op amp.","PeriodicalId":128355,"journal":{"name":"Proceedings of the Fifteenth National Radio Science Conference. NRSC '98 (Cat. No.98EX109)","volume":"87 8","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120906250","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