DivyaMurali_Masters_Thesis

DivyaMurali_Masters_Thesis - A SAMPLING METHOD FOR THE...

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A SAMPLING METHOD FOR THE REDUCTION OF POWER CONSUMPTION IN BATTERY OPERATED UHF RECEIVERS A Thesis Presented to The Graduate Faculty of The University of Akron In Partial Fulfillment of the Requirements for the Degree Master of Science Divya Murali December, 2008
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A SAMPLING METHOD FOR THE REDUCTION OF POWER CONSUMPTION IN BATTERY OPERATED UHF RECEIVERS Divya Murali Thesis Approved: Advisor Dr. Nathan Ida Committee Member Dr. James Grover Committee Member Dr. George Giakos Accepted: Department Chair Dr. Jose A. De Abreu-Garcia Dean of the College Dr. George K. Haritos Dean of the Graduate School Dr. George R. Newkome Date ii
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ABSTRACT The use of UHF low power wireless links is prevalent in a variety of battery operated devices like remote entry systems and RFID devices used in industrial and consumer applications. Most current applications of wireless remote control assume that the transmitter only operates when necessary, so power consumption is not an issue. But the receivers must be on at all times ready to receive a transmission. Power reduction at the receiver is extremely important, otherwise it would drain the battery very quickly. Much effort has been invested in reducing the power consumption at the receiver’s end. Commercially available receivers consume few mA in continuous operation. Techniques like duty cycling and polling have been devised to reduce the power consumption further. This thesis proposes a simple yet effective technique to wake up the receiver by sampling its output for very short intervals of time. The power reduction achieved using this method is very high compared to currently available techniques. iii
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DEDICATION Dedicated to my grandfather P.Meenakshi Sundaram. iv
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ACKNOWLEDGEMENTS I would like to thank my adviser Dr. Nathan Ida for his invaluable support and guidance throughout my thesis work. He has been my constant source of inspiration and without his support this work would not have been possible. I thank Dr. James Grover and Dr. George Giakos for serving in my committee. I owe my thanks to Mr. Mike Ward who helped me in strengthening my research work by giving me new ideas. I express my gratitude to the department of Electrical and Computer Engi- neering for providing me financial support in completing my Masters study. I would like to thank Dr. Tsukerman for making my teaching experience enjoyable. I am also grateful to Dr. Julie Zhao for her guidance and encouragement. I extend my sincere thanks to Erik Rinaldo and Greg Lewis who provided all infrastructure needed for my work. Thanks to Gay Boden for all her help and time. I take this opportunity to thank my father G. Murali, mother M. Shanthi, grandmother M. Jayalakshmi, my friends Sravanthi and Srutha for their support and encouragement. Special thanks to M. Balamurali for his guidance.
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