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Power efficient OFDM signals with reduced symbol's aperiodic autocorrelation

World Academy of Science, engineering and technology 2010年 37卷 602-607页

作者： Hussain, Ibrahim M. Department of Computer Engineering Sir Syed University of Engineering and Technology Karachi 75300 Pakistan

Three new algorithms based on minimization of autocorrelation of transmitted symbols and the SLM approach which are computationally less demanding have been proposed. In the first algorithm, autocorrelation of complex data sequence is minimized to a value of 1 that results in reduction of PAPR. Second algorithm generates multiple random sequences from the sequence generated in the first algorithm with same value of autocorrelation i.e. 1. Out of these, the sequence with minimum PAPR is transmitted. Third algorithm is an extension of the second algorithm and requires minimum side information to be transmitted. Multiple sequences are generated by modifying a fixed number of complex numbers in an OFDM data sequence using only one factor. The multiple sequences represent the same data sequence and the one giving minimum PAPR is transmitted. Simulation results for a 256 subcarrier OFDM system show that significant reduction in PAPR is achieved using the proposed algorithms.

关键词： Peak to average power ratio

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Investment supervision in stock market

Investment supervision in stock market

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International Conference on computer Applications and Industrial Electronics (ICCAIE)

作者： Umm-e-Laila S. Faisal Ahmed Bukhari Abdul Raees Umm-e-Farwa Department of Computer Engineering Sir Syed University of Engineering and Technology Karachi Pakistan Department of Maths & Sciences Sir Syed University of Engineering and Technology Karachi Pakistan

Stock market plays a vital role in country's economy and financial system. It has many impacts on the economy like raising capital for businesses, aiding company growth, corporate governance, mobilizing savings for the investment, reallocation of wealth, government capital-raising for development. In stock market the investors are normally dependent on brokers for appropriate selection of shares for buying and selling. These dependencies normally have many issues like brokerage, monopoly of broker. In order to reduce dependency on the broker, a model is proposed for investment supervision that will help investor to find out the possible trends in shares for future investment. This model is used to analyzes the past financial statements of a company and it shows effectiveness of the company's share. On behalf of the results the user can take decisions for future investment in that company. This model uses ratio analysis for analyzing the financial statements.

关键词： Companies Investments Biological system modeling Stock markets Analytical models Data models

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Vehicle detection using morphological image processing technique

Vehicle detection using morphological image processing techn...

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International Conference on Multimedia Computing and Information technology (MCIT)

作者： Aisha Ajmal Ibrahim M. Hussain Department of Computer Engineering Sir Syed University of Engineering and Technology Karachi Pakistan

Vehicle detection and classification of vehicles play an important role in decision making for the purpose of traffic control and management. In this paper we propose a novel and efficient algorithm based on image processing using aerial cameras for vehicle detection and classification especially in highways. The algorithm is mainly based on a sequence of morphological methods being applied on an image taken by an aerial camera of a road segment. The algorithm also uses thresholding and edge detection techniques for vehicle detection. Experiments are carried out over a wide range of vehicles, road segments and camera heights. A success rate of more than 85% and proper vehicle classification is achieved.

关键词： Vehicle detection Image processing Cameras Image segmentation Image edge detection Automotive engineering Road vehicles Object detection Shape control Decision making

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Fairness and quality of service issues and analysis of IEEE 802.11e wireless LAN

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World Academy of Science, engineering and technology 2010年 37卷 869-875页

作者： Abbas, Ammar Hussain, Ibrahim M. Hussain, Osama M. Department of Computer Engineering Sir Syed University of Engineering and Technology Karachi 75300 Pakistan Sultan Qaboos University Muscat Oman

The IEEE 802.11e which is an enhanced version of the 802.11 WLAN standards incorporates the Quality of Service (QoS) which makes it a better choice for multimedia and real time applications. In this paper we study various aspects concerned with 802.11e standard. Further, the analysis results for this standard are compared with the legacy 802.11 standard. Simulation results show that IEEE 802.11e out performs legacy IEEE 802.11 in terms of quality of service due to its flow differentiated channel allocation and better queue management architecture. We also propose a method to improve the unfair allocation of bandwidth for downlink and uplink channels by varying the medium access priority level.

关键词： Quality of service

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Home Automation And Security System via PSTN

Home Automation And Security System via PSTN

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2010 2nd International Conference on Education technology and computer(第二届IEEE教育技术与计算机国际会议 ICETC 2010)

作者： Faizan Farid Muhammad Rehan Faiza Faizan M Tahir Qadri Department of Electronic Engineering Sir Syed University of Engineering & TechnologyKarachi Pakistan

ISBN: (纸本)9781424463671;9781424463688;9781424463701

The objective here is to develop a home automation and security system which can be controlled and monitored remotely using any telephone line. The user can enter into the system by entering the valid pin code. After entering into the system, the user can control the status of devices connected with the system using any Public Switched Telephone Network (PSTN). The system can also be implemented for security purposes in banks or at home. If the user is at outstation, he can change the status of the lights remotely for security reasons. The heart ofthe system is a PIC micro-controller (PICI8F4520) which controls the complete working of the system. The GSM modem is also interfaced with the micro-controller. The remote user can also monitor the current status of the devices by sending SMS message to the GSM modem. The system can be controlled and monitored from anywhere by using telephone line.

关键词： Home Automation telephone security controlingby telephone Bank Automation

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Implementation of Discrete PID on Inverted Pendulum

Implementation of Discrete PID on Inverted Pendulum

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2010 2nd International Conference on Education technology and computer(第二届IEEE教育技术与计算机国际会议 ICETC 2010)

作者： FaizaFaizan Faizan Farid Muhammad Rehan Shoaib Mughal MTahirQadri Department of Electronics Engineering Sir Syed University of Engineering & TechnologyKarachi Pakistan

ISBN: (纸本)9781424463671;9781424463688;9781424463701

The objective here is to implement the discrete PID on pendulum. The idea is to balance an Inverted pendulum electro-mechanically using Proportional Integral Differential (PID) Control. The heart of the system is a PIC microcontroller (PICI8F4520). Controller commands the motor through PWM signal, which drives the cart to balance the pendulum in an inverted position. Pendulum's angular position is fed back by an incremental encoder mounted on its base, which is read by controller. Controller then calculates error and runs the PID algorithm to generate a new command signal. The exact position of pendulum with the value of its gains are sent to the attached Personal computer (PC) using RS-232 protocol. The front panel is built in LabVIEW software.

关键词： Inverted pendulum Discrete PID PWM control Close loop system

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Irregular Surface Area Measuring Instrument

Irregular Surface Area Measuring Instrument

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2010 2nd International Conference on Education technology and computer(第二届IEEE教育技术与计算机国际会议 ICETC 2010)

作者： Muhammad Rehan Faizan Farid Shoaib Mughal M Tahir Qadri Department of Electronic Engineering Sir Syed University of Engineering & TechnologyKarachi Pakistan

ISBN: (纸本)9781424463671;9781424463688;9781424463701

The objective here is to develop a flat surface area measuring system which is used to calculate the surface area of any irregular sheet. The irregular leather sheet is used in this work. The system is self protected by user name and password set through software for security purpose. Only authorize user can enter into the system by entering the valid pin code. After entering into the system, the user can measure the area of any irregular sheet, monitor and control the system. The heart of the system is Programmable Logic Controller (Master K80S) which controls the complete working of the system. The controlling instructions for the system are given through the designed Human to Machine Interface (HMI). For communication purpose the GSM modem is also interfaced with the Programmable Logic Controller (PLC). The remote user can also monitor the current status of the devices by sending SMS message to the GSM modem.

关键词： frrregular sheet surface area Area measurement Automated surface measurement

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The Pivotal Role of Tera-scale Performance in Future Networks: Sequoia vs Multi-core Teraflop Chip

The Pivotal Role of Tera-scale Performance in Future Network...

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International Conference on Future Networks, ICFN

作者： Samreen Amir Muhammad Asif Maria Mustafa Electronic Engineering Department Sir Syed University of Engineering and Technology Karachi Pakistan

ISBN: (纸本)9781424456666;9780769539409

With the increasing greed for the high data rates and maximum bandwidth utilization, the technology improvement and enhancement is been exponential in the current decade. Researchers hope that massive parallel processing (MPP) computing equipment will provide processing rates of 10 trillion or quadrillion floating-point operations per second. It would allow scientists to build models of phenomena that have never before been imitated. Many vendors are busy in the research and development of such speedy machines. This paper will provide a comparative analysis of the future high computing machines in terms of speed, size applications, architecture and affordability. A predictive conclusion regarding the dominance of one on the other will also be drawn on the basis of this comparison.

关键词： Supercomputers Bandwidth Engines Portable computers Space technology computer architecture Multicore processing Moore's Law Costs Workstations

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Transmit and receive crosstalk cancellation

Transmit and receive crosstalk cancellation

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International Conference on Emerging Technologies, ICET

作者： Najam Muhammad Amin Michael Weber Electronic Engineering Department Sir Syed University of Engineering & Technology Karachi Pakistan Communication Engineering Department Nokia Siemens Networks Ulm Germany

In modern mobile communication systems higher bandwidths are required by users. But higher bandwidths mean, that in Frequency Division Duplex (FDD) standard where uplink and downlink is separated, the receive band has to be protected against the transmit band. Violation of the receiver is caused by distortion coming from the transmitter, which is insufficiently suppressed by Transmit (TX) duplex filter in the receive (RX) band. Another type of distortion is called passive intermodulation (PIM). Reason for this is material nonlinearity and contact nonlinearity. The aim of this paper is to find a mathematical description of the passive nonlinearities and to reduce them in the digital baseband of the receiver. Two modeling techniques namely linear and nonlinear, the underlying algorithm and implementation of this algorithm on Gaussian Minimum Shift Keying (GMSK) modulated signals have been discussed and the results are presented. Firstly a brief introduction to intermodulation distortion is provided, followed by an overview of the hardware setup so that the reader can get acquainted to the hardware configuration used. An overview of the algorithm, which is the essence and underlying concept for intermodulation distortion suppression, is discussed, and finally implementation of this algorithm on GMSK signals along with its results is presented.

关键词： Receivers Power harmonic filters Band pass filters Finite impulse response filter Intermodulation distortion Power amplifiers

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Association of pre-pregnancy weight and weight gain with perinatal mortality 10

Association of pre-pregnancy weight and weight gain with per...

引用

Proceedings of the 8th International Conference on Frontiers of Information technology

作者： Qureshi, Hammad Khan, Mahjabeen Quadri, syed Mustafeel Aser Hafiz, Rehan School of Electrical Engineering and Computer Science National University of Science and Technology Islamabad Pakistan Obstetrics and Gynaecology Department Dow University of Health Sciences Karachi Pakistan Institute of Environmental Studies University of Karachi Karachi Pakistan

ISBN: (纸本)9781450303422

Reducing infant mortality is one of the primary Millennium Development Goals 2015. A lot of effort has been made to reduce infant mortality but it remains high in most of the developing countries and the underdeveloped world. Perinatal Mortality is a cause of great emotional pain and social unrest. The main cause of pregnancy failure in the developed world is obesity but in the under-developed world the main cause remains malnutrition. However, their are a mix of factors that affect pregnancy failure in the developing countries. Pakistan has a very high infant mortality rate which stands at 78 deaths per 1000 births. The reasons for this are many including lack of proper healthcare. This is because of a severe shortage of healthcare professionals and specialists in Pakistan. The gap in healthcare may be overcome by leveraging IT to provide automated healthcare. In this paper, we show how machine learning may be used to predict perinatal failure. We examine the relationship between pre-pregnancy weight, weight gain during pregnancy and the body mass index (BMI) to investigate how they relate to foetal failure. We employ the K Nearest Neighbor (K-NN) technique to automatically differentiate between successful and failed pregnancies. Our method is able to predict the the outcome of a pregnancy with about 95% accuracy. Copyright © 2010 ACM.

关键词： Developing countries

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