Mr Ashwin Sankaranarayanan

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Performance Analysis for Wideband Antenna Arrays based on Tapped – Delay Lines This dissertation is a part requirement for the degree in MSc in Data Communications at

Department of Electrical and Electronics Engineering
By
Karthick Sekar
7 September, 2012
Supervisor: Dr. Wei Liu

Declaration
All sentences or passages quoted in this dissertation from other people's work have been specifically acknowledged by clear cross-referencing to author, work and page(s). Any illustrations which are not the work of the author of this dissertation have been used with the explicit permission of the originator where possible and are specifically acknowledged. I understand that failure to do this amount to plagiarism and will be considered grounds for failure in this dissertation and the degree examination as a whole

Name: Karthick Sekar

Abstract
The success of examining the bandwidth performance of a wideband antenna array relies on the optimal performance of each element present to signal processing. This is examined in terms of the direction of arrival (DOA) i.e. the direction of the interfering signals (desired signal and desired interference signals) and the interspacing between the tapped delay and length of the taps with the weights. The performance of the bandwidth is examined for a two element adaptive array with the use of the tapped delay line technique by keeping each element behind the tapped delay line. When a tapped delay line is introduced, the signal to noise-interference ratio improves for various signal bandwidths resulting in an increase of sensor numbers in the structure of the narrowband beam former and by varying the length of the tapped delay lines (TDL’s) to obtain a well known wideband beamforming structure. These TDL’s along with traditional linear array combine well to form an effective and well known beam form. “The characteristics are in such a way that they form a beam effectively with its azimuth range of over half and its response well over its repetition on the other side of the first half. The coefficients of the traditional wideband beam former are generally real valued and for the rectangular array the coefficients are generally complex valued as two implementation schemes are proposed for the impinging signals”. The performance analysis of a wideband beamformer will be analysed in terms of its output SINR with given different directions of arrival of impinging signals, different signal power levels and different number of antennas.

Acknowledgments
This research document is product of my hard work, perseverance, constant and continuous support from my dedicated teachers, friends and emotional support of my family. It would be more appropriate to mention someone who has always been with me through best and testing times, showing me the way and quench my thirst for knowledge through association of great scholars is none other than “GOD” who has ever been my motivator. This is an ode to His lotus feet. I would like to thank my supervisor Dr. Wei Liu whose encouragement, guidance and support from the beginning till the end of project assisting me by giving important inputs in understanding and implementing this project and subject. He has been a true motivation for me in this project along with Mr. Jonathan Rigelsford the second marker for my dissertation. My special thanks to all the staff members from Department of Electrical and Electronics Engineering, The University of Sheffield. I am whole heartedly thankful to my parents Mr. K. Sekar and Mrs. Nalini Sekar for their love and unrelenting support throughout my education and I would also like to specially thank ex- professional colleagues who had assisted me in many fronts. Prof. Jordi Griera Roig is another special person to whom I owe a lot, who has been the main source of inspiration for taking up this course at University of Sheffield. Last but not least, my heartfelt thanks to all of my friends in supporting and helping me...
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