Browsing by Author "Hassan Mahmood"

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    Study and simulation of digital modulation techniques in presence of AWGN
    (University of Management and Technology, 2014) Hassan Mahmood; Sohail Afzal; Faiz Ismail, Muhammad
    Introduction Communication has been one of the deepest needs of human throughout the history. Good communication is central to civilized society. Today we live in a world of technology .The purpose of communication system is to transport and information bearing signal from a source to a user destination via communication channel. A communication system is of analog and digital type. In an analog communication system the information bearing signal is continuously varying in both amplitude and time. While in a digital communication system the information bearing signal is represented by a discrete messages. Digital communication is the transfer of data over point to point channel. It is the transfer of discrete messages. The messages are represented by pulses using a digital modulation method. With digital systems great stores of information can be transmitted more speedily and accurately. The advantages of digital communication include the ability to eliminate noise and distortion at each repeaters greater accuracy than analog systems and the ability to use error detection and error codes. Many digital systems are in use today. Pulse width modulations are commonly used. Pulse amplitude modulation, Delta modulation and PCM are also being developed. The digital communication has great growth in scope and application.
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    Wind turbine power generation system
    (2011) Rashid Ashraf, M; Abdul Basit; Hassan Mahmood
    The goal of this project is to design and implement a wind turbine system that charge up the dc battery with capabilities of charge controller a digital voltmeter to monitor battery voltages and an inverter module to convert dc into ac. Some of the specifications that we sought to achieve in our project is to design a mechanical system for turbine generator to produce 12V or above in a wind speed of about 12 to 13 Mph a charge controller based on voltage level sensing a 31/2 digit digital voltmeter with 0.1% accuracy and a 100 watt inverter module. The complete system will consist on wind turbine mounting assembly and three processing circuits charge controller, digital voltmeter and an inverter module. By implementing this system we are showing how different devices are integrate together to form a complete active alternative energy system.