Title

Integrated broadband microphotonic beamformer for adaptive nulling in smart antennas

Date of Award

2010

Degree Type

Thesis

Degree Name

Doctor of Philosophy

Faculty

Faculty of Computing, Health and Science

First Advisor

Professor Kamal Alameh

Second Advisor

Professor Lee Yong-tak, Gwangju Institute of Science and Technology

Abstract

The tremendous growth of the wireless communications sector and the problem of limited available spectrum that can be used to cater the wireless demand have spurred the need for better data transmission capacity and signal rates for wireless communication systems. Smart antennas are the promising technology for improving the wireless communication systems performance. Smart antennas are system that consist of antenna arrays capable of adaptively adjusting the beam pattern, thereby enhancing the desired signals (beam steering) and suppressing the interference signals (null steering), which is also known as Space Division Multiple Access (SDMA). SDMA systems allow significant improvement in the area of capacity, signal bandwidth, signal-to-interference ratio, and frequency reuse. Due to the increasing complexity of the smart antennas system, innovations and improvements in miniaturisation, power consumption, and cost are needed. These breakthroughs could be achieved by combining the microelectronic and photonic technologies, leading to an innovative software-driven broadband MicroPhotonic beamforming system.

This thesis presents a doctoral study of integrated MicroPhotonic smart antenna beamformers. The beamformers presented in this study is based on microminiaturisation of hotonic and electronic components, which processes RF-modulated optical signals and adaptively synthesises multiple broadband null for interference suppression. Two types of beamformer are investigated in this thesis; the first form is based on delaying the input RF signal via discrete, high-resolution true-time delay (TTD) through the use of free space optics. The second type is based on continuous TTD generation using an Opto-VLSI processor in conjunction with high-dispersive optical fibres.

Design, simulation and proof-of-concept demonstration of some of the photonic building blocks and RF components of smart antennas that employ the MicroPhotonic beamformer are presented. These smart antennas are designed for use in adaptive broadband phased-array antenna applications including multimedia wireless transmission and RADAR.

LCSH Subject Headings

Edith Cowan University. Faculty of Computing, Health and Science -- Dissertations
Wireless communication systems
Adaptive antennas
Dissertations

Dissertations.

Access Note

Access to this thesis - the full text is restricted to current ECU staff and students by author's request. Email request to library@ecu.edu.au

Access to this thesis is restricted. Please see the Access Note below for access details.

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