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Implementation of Dynamic Channelization on SONET

Implementation of Dynamic Channelization on SONET

引用

International Conference on Advanced Communication technology (ICACT)

作者： M. Irfan Anis M. Waqas M. Sadiq M. Javaid Shafiq Ur Rahman M. Arsalan Department of Electronics Engineering Sir Syed University of Engineering and Technology Karachi Pakistan

The SONET systems are faster than the other optical network but there is a problem of allocation of static channels to the users. If one of the users is in idle condition the channel remains unused through out the whole process of frame transmission, this problem decreases the efficiency of the SONET system. In order to overcome this deficiency it is required to design the allocation of the channels dynamically, making the channels not dedicated to any specific user, and any channel could be utilized at any particular time if it is in idle state. Both reserved and priority based channelization are discussed and compared with dynamic channelization.

关键词： SONET Optical fiber networks Optical fibers Optical interconnections Optical sensors Optical fiber communication Synchronous digital hierarchy Optical fiber devices Standards development Open systems

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Comparison between the IEEE 802.11x standards of VoIP using the CBR and VBR voice schemes

Comparison between the IEEE 802.11x standards of VoIP using ...

引用

IEEE Radio and Wireless Symposium (RWS formerly RAWCON)

作者： M. Irfan Anis M. Zamin Khan Jahanzeb Inam Rana Azmatullah Department of Electronics Engineering Sir Syed University of Engineering and Technology Karachi Sindh Pakistan

Voice over Internet protocol (VoIP) is one of the fastest growing Internet application. This paper focuses on the support of VoIP over 802.11x WLAN. A multiplexing scheme for VoIP is provided which exploits multicasting over WLAN for the downlink VoIP traffic. The 802.11x WLAN can support more than 500 VoIP sessions, but due do the inclusion of large number of over headers this ratio comes to only few VoIP sessions by using GSM 6.10 codec standard. This paper shows the VoIP standard 802.11g is the best by comparing the three standards 802.11a, 802.11b and 802.11g as well for both CBR and VBR voice sources. This has been discussed by using the features of multicast mode of WLAN by which the large overhead effects of VoIP can be reduced. This paper shows this simulation and calculations, based on multiplex-multicast scheme through which the number of VoIP sessions can be increased and determine the best VoIP standard for CBR and VBR sources.

关键词： Wireless LAN Codecs Downlink GSM Speech analysis Internet telephony Bit rate Bandwidth Payloads Code standards

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PAPR Analysis in OFDM Signals Based on Power Variance

PAPR Analysis in OFDM Signals Based on Power Variance

引用

The 4th International Conference on Wireless Communications, Networking and Mobile Computing(第四届IEEE无线通信、网络技术及移动计算国际会议)

作者： Ibrahim M.Hussain Imran A.Tasadduq Department of Computer Engineering Sir Syed University of Engineering and Technology Karachi Pakist Department of Telecom and Computer Engineering FAST-National University Karachi Pakistan

The relationship among the peak-to-average power ratio (PAPR), aperiodic autocorrelation co-efficient and power variance (PV) is discussed. We show that low values of PV do not always correspond to low values of PAPR as has been mentioned in literature. Hence PV cannot be used as a basis for comparison and measure of PAPR for OFDM signals. Further through simulations we assert that PV can be a good criterion for high values for PAPR, while for the moderate ones it might fail. Finally, we show that PV based comparison in SLM and PTS techniques gives degraded PAPR performance compared to the actual PAPR based comparison.

关键词： Aperiodic autocorrelation co-efficien OFDM PAPR Power variance SLM

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OPGW - our experience in KESC

OPGW - our experience in KESC

引用

IEEE Canada Electric Power Conference, EPEC

作者： syed Abrar Ali Bilal Ahmad Alvi Muhammad Asif Design and maintenance engineer Electrical power transmission and distribution Electronic Engineering Department Sir Syed University of Engineering and Technology Karachi Pakistan

KESC is an electrical utility company involved in generation, transmission and distribution of electric energy in Karachi, Pakistan. The total number of consumers of KESC to date is around 2.0 million. KESC started installing OPGW for providing data to the SCADA system in 1998 and till year 2006 around 151 km OPGW is installed. These OPGW cables connect the SCADA system to 8 power generating stations including the KESC generation stations and 56 grid stations of IPPs. In the course of testing and monitoring the installed OPGW, it was revealed that the OPGW installed at various transmission lines have been damaged. On close inspection of the samples taken from the damaged OPGW, it is found that the outer OPGW layer was almost melted and strings were broken. The optical fiber cable inside OPGW was also tested with the OTDR and it was also found broken. Therefore, it is concluded that the outer OPGW layer could not stand the voltage introduced due to the lighting strokes. In addition, the distance between the hanging OPGW was not enough to withstand the million of volts and a flash occur between OPGW. In this paper, the selection criteria of OPGW cables based on engineering specification are discussed. This paper also discusses the methods and standardized test procedures for OPGW cables. Finally, the replacement strategy of the conventional ground wire by OPGW is presented.

关键词： SCADA systems Mesh generation Power generation Monitoring Power transmission lines Inspection Optical fiber cables Optical fiber testing Voltage Wire

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Cost effective portable system for sign language gesture recognition

Cost effective portable system for sign language gesture rec...

引用

IEEE International Conference on System of Systems engineering (SoSE)

作者： Yousuf Khambaty Rolando Quintana Mehdi Shadaram Sana Nehal Muneeb Ali Virk Waqar Ahmed Ghayas Ahmedani Department of Electrical & Computer Engineering University of Texas San Antonio San Antonio TX USA Department of Management Science and Statistics University of Texas San Antonio San Antonio TX USA Electronic Engineering Department Sir Syed University of Engineering and Technology Karachi Sindh Pakistan

This paper presents a standalone system that converts static gestures into voice. It is also known as GesTALK. The primary input device is the self design and cost effective Data Glove. It operates in two basic modes. In first mode the system speaks a single alphabet for a static gestures made by the user, while in second mode the system speaks complete string by concatenating words. Various gestures of alphabets are made to spell out the words involved in string. This system has been shown to work for both American Sign Language (ASL) and Pakistan Sign Language (PSL) and other language models. Results show that the system recognizes 24 out of 26 letters; an overall accuracy of 90% is achieved.

关键词： Costs Handicapped aids Data gloves Shape Virtual reality Fingers Pattern recognition Auditory system Dictionaries Toy manufacturing industry

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Performance evaluation of non linear phase shift and chromatic dispersion in DWDM network

Performance evaluation of non linear phase shift and chromat...

引用

2007 International Symposium on High Capacity Optical Networks and Enabling Technologies, HONET

作者： Anis, M. Irfan Ibrar ul Haq, M. Paracha, Jawwad Department of Electronics Engineering Sir Syed University of Engineering and Technology Pakistan

ISBN: (纸本)1424418283

Wavelength-division multiplexing (WDM) is a technology which multiplexes multiple optical carrier signals on a single optical fiber by using different wavelengths (colors) of laser light to carry different signals. It has been previously found that using polarized light decreases crosstalk in DWDM systems. Explicit expressions and simulations, based on parameters which enable a quick evaluation of feasibility may be used for the optimization of DWDM network and how to maintain data rate throughout the system, so that the effects of chromatic dispersion and non linear phase shift are minimum.

关键词： Dense wavelength division multiplexing

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Performance evaluation of non linear phase shift and chromatic dispersion in DWDM network

Performance evaluation of non linear phase shift and chromat...

引用

International Symposium on High Capacity Optical Networks and Enabling Technologies, HONET

作者： M. Irfan Anis M. Ibrar ul Haq Jawwad Paracha Department of Electronics Engineering Sir Syed University of Engineering and Technology Pakistan

ISBN: (纸本)9781424418282

关键词： Optical fiber dispersion Optical fiber polarization Optical fibers Optical fiber amplifiers Signal to noise ratio Dispersion Optical fiber networks

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Hand Off Issues in 3G UMTS Networks

Hand Off Issues in 3G UMTS Networks

引用

International Bhurban Conference on Applied Sciences & technology, IBCAST

作者： Tauseef Mubeen Imran Ali Tasadduq Junaid Ahmed Zubairi Department of Computer Engineering Sir Syed University of Engineering and Technology Pakistan Department of Computer Science State University of New York Fredonia USA Department of Computer Engineering Sir Syed University of Engineering and Technology

Universal Mobile Telecommunication System (UMTS) is a third generation mobile communication technology based on wideband CDMA (WCDMA) and can facilitate the users in much better way as compared to the second generation of mobile communication. UMTS is superior to second generation in terms of bandwidth efficiency, quality of service, speech quality, speed and capacity. At present, more than 60 countries using WCDMA technology are operating commercially in 25 countries. In this paper, we focus on soft and hard handover issues in UMTS networks. In order to simulate a typical UMTS scenario we use OPNET modeler where a number of users are generating traffic and are free to move in various cells.

关键词： 3G mobile communication Multiaccess communication Switching circuits Packet switching Quality of service Spine Mobile communication Ground penetrating radar Base stations Wideband

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Significance of Region of Interest applied on CT image in Teleradiology-Telemedicine

Significance of Region of Interest applied on CT image in Te...

引用

International Conference on Systems, Signals and Image Processing, IWSSIP

作者： P. Akhtar T. J. Ali M. I. Bhatti M. A. Muqeet EPE Department PNEC University of Science and Technology Karachi Pakistan BMED Department Sir Syed University of Engineering and Technology Karachi Pakistan

Within the expanding paradigm of medical imaging in teleradiology-telemedicine there is increasing demand for transmitting diagnostic medical imagery. These are usually rich in radiological contents and the associated tile sizes are large which must be compressed with minimal file size to minimize transmission time and robustly coded to withstand required network medium. It has been reinforced through extensive research that the diagnostically important regions of medical images, the region of interest (ROI) must be compressed by lossless or near lossless algorithm while on the other hand, the background region be compressed with some loss of information but recognizable using JP2K standard. Applying on CT image achieved higher compression level analogously minimum transmission time, the MAXSHIFT method proved very effective subjectively and objectively.

关键词： Computed tomography Biomedical imaging Medical diagnostic imaging Image coding Image reconstruction Discrete wavelet transforms Biomedical engineering Telemedicine Costs Image analysis

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Efficient power variance algorithms for PAPR reduction in OFDM signals

Efficient power variance algorithms for PAPR reduction in OF...

引用

10th IEEE International Multitopic Conference 2006, INMIC

作者： Hussain, Ibrahim M. Tasadduq, Imran A. Department of Computer Engineering Sir Syed University of Engineering and Technology Karachi Pakistan

ISBN: (纸本)142440794X

In this paper, the expression of the power variance (PV) of an OFDM symbol has been explored for peak to average power ratio (PAPR) reduction. It is seen through simulation results and complementary cumulative distribution function (CCDF) curves that PV expression used in PAPR comparison can be simplified to a point where it becomes practical to use such a computationally complex PV expression for PAPR comparison. © 2006 IEEE.

关键词： Peak to average power ratio

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