2011 28th National Radio Science Conference (NRSC)最新文献

QoS adaptation in real time systems based on CBWFQ 基于CBWFQ的实时系统QoS自适应

2011 28th National Radio Science Conference (NRSC) Pub Date : 2011-04-26 DOI: 10.1109/NRSC.2011.5873626

S. Badr, F. Bayoumi, G. Darwesh

{"title":"QoS adaptation in real time systems based on CBWFQ","authors":"S. Badr, F. Bayoumi, G. Darwesh","doi":"10.1109/NRSC.2011.5873626","DOIUrl":"https://doi.org/10.1109/NRSC.2011.5873626","url":null,"abstract":"The evolution of the World Wide Web (WWW) service has incorporated new distributed multimedia conference applications, powering a new generation of e-services development, and allowing improved interactivity [1]. Most common interactive real-time applications are fault-tolerant but suffer from QoS limitations; low-latency requirements and reliability are cumulative to conference success [2], it may easily absorb all network resources and the subjective quality sensed by users would remain poor if the available resources are used indiscriminately. This paper simulates a network infrastructure design that classifies and prioritizes the real-time traffic in order to improve the performance of the real-time applications, taking into consideration of the performance of non real-time applications. This infrastructure has been designed to present a typical network of a university campus, so that in this way it can be implemented in any campus. In this paper 3 scenarios are suggested first before enabling any QoS mechanism at the routers, second use class based weighted fair queuing using low latency queue (CBWFQ-LLQ) for video traffic and last scenario apply CBWFQ-LLQ for voice. The simulation is conducted using OPNET IT Guru. Simulation results demonstrated that applying LLQ for voice improves the performance of overall real-time and non real-time application.","PeriodicalId":438638,"journal":{"name":"2011 28th National Radio Science Conference (NRSC)","volume":"138 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115675256","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: 9

A simple 8-bit digital microcontroller implementation for chaotic sequence generation 一个简单的8位数字微控制器实现混沌序列生成

2011 28th National Radio Science Conference (NRSC) Pub Date : 2011-04-26 DOI: 10.1109/NRSC.2011.5873617

A. K. Aboul-Seoud, E. El-Badawy, A. Mokhtar, W. El-Masry, Mohamed El-Barbry, Alaa El-Din Sayed Hafez

{"title":"A simple 8-bit digital microcontroller implementation for chaotic sequence generation","authors":"A. K. Aboul-Seoud, E. El-Badawy, A. Mokhtar, W. El-Masry, Mohamed El-Barbry, Alaa El-Din Sayed Hafez","doi":"10.1109/NRSC.2011.5873617","DOIUrl":"https://doi.org/10.1109/NRSC.2011.5873617","url":null,"abstract":"This paper introduces a simple implementation of digital chaotic sequence generator. The implementation is based on using microcontroller ATMGA 16 to generate the chaotic map required for advanced encryption standard (AES) encryption scheme s-box and radar frequency agile control. The implemented circuit is simple, low cost and suitable for use with identification friend or foe (IFF) equipped with data encryption systems. The circuit also can changes the carrier frequency of the transmitted signal based on chaotic map, benefits a security and confidentiality to the radar waveform against Electronic Counter Measurement (ECM). The circuit generates 256 random sequences at different initial conditions and each of them has 256 sequences generated from different bifurcation parameters. The circuit is simulated under Matlab program environment and Proteus circuit simulation program. A security analysis for the implemented circuit is demonstrated. The results show the superiority of the circuit for generating the random sequences forming an efficient s-box for IFF system and radar frequency agility.","PeriodicalId":438638,"journal":{"name":"2011 28th National Radio Science Conference (NRSC)","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127080525","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: 9

Impedance bandwidth enhancement of UWB monopole antenna by using rectangular shaped slot 利用矩形槽增强UWB单极天线的阻抗带宽

2011 28th National Radio Science Conference (NRSC) Pub Date : 2011-04-26 DOI: 10.1109/NRSC.2011.5873582

A. Abdel-Rahman, A. E. El Dein, M. A. Mostafa

引用次数: 0

Compact Ultra-Wideband monopole antenna design for wireless communication using differential evolution optimization algorithm 基于差分进化优化算法的小型超宽带无线通信单极天线设计

2011 28th National Radio Science Conference (NRSC) Pub Date : 2011-04-26 DOI: 10.1109/NRSC.2011.5873583

A. Montaser, K. Mahmoud, H. Elmikati

引用次数: 1

Fundamental Research directives in applied electromagnetics 应用电磁学基础研究方向

2011 28th National Radio Science Conference (NRSC) Pub Date : 2011-04-26 DOI: 10.1109/NRSC.2011.5873640

S. Mikki, Y. Antar

引用次数: 9

High-directive dielectric resonator antenna over curved ground plane using metamaterials 基于超材料的弯曲地平面上高定向介质谐振器天线

2011 28th National Radio Science Conference (NRSC) Pub Date : 2011-04-26 DOI: 10.1109/NRSC.2011.5873588

S. Zainud-Deen, M. Ibrahim, A. Botros

引用次数: 7

Modified cross-layer scheduling for mobile WiMAX networks 改进了移动WiMAX网络的跨层调度

2011 28th National Radio Science Conference (NRSC) Pub Date : 2011-04-26 DOI: 10.1109/NRSC.2011.5873602

N. El-Fishawy, M. Zahra, M. Ebrahim, Mostafa M. El-gamala

{"title":"Modified cross-layer scheduling for mobile WiMAX networks","authors":"N. El-Fishawy, M. Zahra, M. Ebrahim, Mostafa M. El-gamala","doi":"10.1109/NRSC.2011.5873602","DOIUrl":"https://doi.org/10.1109/NRSC.2011.5873602","url":null,"abstract":"The IEEE 802.16 standard defines wireless broadband access technology called Worldwide Interoperability for Microwave Access (commonly called fixed WiMAX). WiMAX introduces several interesting advantages including variable and high data rate, last mile wireless access, point to multipoint communication, large frequency range, and Quality of Service (QoS) for various types of applications. IEEE 802.16e amendment defines mobile WiMAX which includes the fixed WiMAX features plus other features like mobility. However, the actual version of the standard does not define a Medium Access Control (MAC) scheduling architecture in uplink as well as downlink direction. Efficient scheduling design is left for designers and thus providing QoS for IEEE 802.16 Broadband Wireless Access (BWA) system is a challenge for system developers. A scheduling algorithm should take into account the WiMAX QoS classes and service requirements. Cross-layer scheduler which designed for WiMAX networks assign a priority function for every service. The priority functions take into account many parameters like channel conditions, service classes, delay, and throughput. In this paper, the scheduling algorithms will be classified, and a modification in cross-layer scheduling algorithm will be proposed to improve the scheduling performance.","PeriodicalId":438638,"journal":{"name":"2011 28th National Radio Science Conference (NRSC)","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125721021","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

Comparison between LTE and WiMAX based on system level simulation using OPNET modeler (release 16) 基于OPNET modeler系统级仿真的LTE与WiMAX比较(release 16)

2011 28th National Radio Science Conference (NRSC) Pub Date : 2011-04-26 DOI: 10.1109/NRSC.2011.5873596

Mohammed Torad, Ahmed El Qassas, Hadia Al Henawi

引用次数: 11

Proactive transmit opportunity detection in cognitive radio networks 认知无线电网络中的主动传输机会检测

2011 28th National Radio Science Conference (NRSC) Pub Date : 2011-04-26 DOI: 10.1109/NRSC.2011.5873641

A. Tewfik

{"title":"Proactive transmit opportunity detection in cognitive radio networks","authors":"A. Tewfik","doi":"10.1109/NRSC.2011.5873641","DOIUrl":"https://doi.org/10.1109/NRSC.2011.5873641","url":null,"abstract":"The wide proliferation of wireless services and applications with increasing bandwidth needs is rapidly creating a spectrum shortage. However, the problem is caused primarily by inefficient legacy spectrum allocation and utilization policies, so that even when some applications suffer from lack of bandwidth, there is idle capacity in the band they are using or other bands. The FCC, ITU and other regulatory organizations have adopted, or are exploring, alternative spectrum usage policies and regulations to address the issue. The new policies and regulations support an open spectrum policy implemented by cognitive radios and overlay transmissions implemented via ultrawideband technology and/or cognitive radios. This talk describes a revolutionary approach for addressing spectrum scarcity and unlocking hidden communication capacity thereby increasing the reach and utility of wireless connectivity. The non-traditional communication technique studied in this research effort detects transmission opportunities that occur when incumbent primary users enjoy signal to noise ratio values that are higher than the minimum value required to maintain their quality of service. It then judicially exploits these opportunities while preserving the current quality of service of the primary users.","PeriodicalId":438638,"journal":{"name":"2011 28th National Radio Science Conference (NRSC)","volume":"171 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114764701","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

Hemispherical dielectric resonator antenna mounted on or embedded in spherical ground plane with a superstrate 半球形介质谐振器天线，安装在或嵌入球形地平面上

2011 28th National Radio Science Conference (NRSC) Pub Date : 2011-04-26 DOI: 10.1109/NRSC.2011.5873587

S. Zainud-Deen, N. A. El-Shalaby, K. Awadalla

引用次数: 9