DESIGN AND DEVELOPMENT OF A QPSK MODULATOR_Final.pdf

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DESIGN AND DEVELOPMENT OF A QPSK MODULATOR Supervisor Dr. Satya Prashad Majumder Submitted by: Shanaz Akter ID- 07110037 Nusrat Sharmin ID- 07110053 Md. Iftekharul Islam ID- 07110069 Department of Electrical and Electronic Engineering Summer 2010 BRAC University, Dhaka, Bangladesh
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DESIGN AND DEVELOPMENT OF A QPSK MODULATOR DECLARATION This is to certify that the thesis contains our original work towards the degree of Bachelor of Science in Electronics and Communication Engineering at BRAC University. Materials of work found by other researcher are mentioned by reference. Furthermore, this thesis has not been submitted elsewhere for a degree. ………………………………………………….. Signature of Supervisor ( Dr. Satya Prashad Majumder ) Page | 2
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DESIGN AND DEVELOPMENT OF A QPSK MODULATOR ACKNOWLEDGEMENTS We would like to give our gratitude to our Thesis Supervisor Dr. Satya Prasad Majumder who has given us valuable suggestions and inspirations through out the process. We give our admiration to our Co- Supervisor Nazmus Saquib , Lecturer, EEE Department, BRAC University, who has always stayed beside us, encouraged and uphold us whenever we felt exhausted and confused. We give our grateful acknowledge to Ms. Rumana Rahman and Ms. Fariah Mahzabeen, Junior Lecturer, EEE Department, BRAC University, for their kind assistance. They were always available and extremely helpful whenever we went to them for any kind of suggestions. Page | 3
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DESIGN AND DEVELOPMENT OF A QPSK MODULATOR ABSTRACT QPSK or Quadrature Phase-Shift Keying is a higher order modulation scheme used in digital modulation. In this project, we will be implementing a QPSK modulator for a wireless communication link. The carriers will be chosen as orthogonal frequencies to reduce the bandwidth of the output signal. Later the design will be simulated by PSPICE and will be fabricated on a PCB. The output signal waveform will be measured and tested to find the signal quality and the SNR or Signal to Noise Ratio. Page | 4
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DESIGN AND DEVELOPMENT OF A QPSK MODULATOR TABLE OF CONTENTS CHAPTER I INTRODUCTION …………………………………………………………………… ....... 7 1.1 Analysis of Modulation … ….………………. ……………………………….……… 7 1.2 Purposes of Modulation …………………………………………………….………. 8 1.2.1 Ease of Radiation ………….…………………………………………………….. 8 1.2.2 Simultaneous Transmission of Several Signals …………………………….. 8 1.3 Analog modulation methods ……………………………………………………… .... 9 1.4 Digital Modulation Methods ……………………………………………………… ..... 9 CHAPTER II ANALYSIS OF QUADRATURE PHASE SHIFT KEYING (QPSK) 2.1 Phase-Shift Keying ………………………………………………………………… 12 2.2 Binary Phase-Shift Keying (BPSK) ………………………………………………. 13 2.3 QPSK Modulation ………………………………………………………………..…
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