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Advisory Committee Chair

Mohammad R Haider,

Advisory Committee Members

Karthikeyan Lingasubramanian

Dalton S Nelson

Document Type

Thesis

Date of Award

2015

Degree Name by School

Master of Electrical Engineering (MEE) School of Engineering

Abstract

There has been an ever increasing demand and need for high speed and reliable data transfer between a remote transmitter and a receiver station. We have proposed a novel scheme for Ultra Wide Band (UWB) communication technology, to enhance the data rate in single user scenario and to increase the number of sources for simultaneous data transmission in the multi-source scenario. We have proposed to exploit the orthogonal property of Modified Hermite Pulse (MHP) by transmitting the composite pulse (Pulse shape modulation, PSM) instead of transmitting a single orthogonal pulse. With the proposed scheme for data modulation with 4 different orthogonal pulses, the data rate in the single user scenario was increased by 4 folds and in the case of multi-source scenario, it supported 12 sources for simultaneous data transmission. With a threshold value of 21 %, the simulated Bit Error Performance (BER) showed no errors for Eb/No value greater than 10 dB. Operational Transconductance Amplifier (OTA) is the building block of the modified Hermite pulse generator circuit. Commercially available OTA would not satisfy the design constraints like low power, high bandwidth, high slew rate etc. In the second part of the research, a custom OTA was designed to satisfy the design constraints. Furthermore, Beta Multiplier Reference (BMR) current mirror circuit was also designed as a part of the OTA architecture. The enhanced data rate and increase in the number of sources would help in better diagnosis of obscure disease using biotelemetry and it would also create new platform for future high speed applications. Keywords: Ultrawide band communication, orthogonal signals, MHPs, OTA.

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