Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.13/41758
- Title
- A reconfigurable prototyping system for multiple-input multiple-output communications
- Author/Creator
-
Dalton, John
- Institution
- University of Newcastle. Faculty of Engineering and Built Environment, School of Electrical Engineering and Computer Science
- Description
- Masters Research - Master of Engineering
- Description
- This thesis demonstrates the process of building a system to test multiple-input multiple-output (MIMO) communications over-the-air. It covers the entire process, from concept to design and construction, culminating in transmitting space-time coded data packets and producing bit error rate (BER) performance curves. A flexible modular architecture is designed, able to test current MIMO systems and to be upgraded as the field develops. Printed circuit boards for a field-programmable gate array (FPGA) based mainboard, 2.4 GHz transceivers and antennas are then designed, embodying the aforementioned architecture. The mainboard uses a Xilinx XC2S600E FPGA, with ∼600,000 logic gates. Hardware is assembled and tested, forming a foundation for further layers of firmware and software. An abstraction layer, with associated test benches, is written in a hardware description language (VHDL), allowing the core logic of the FPGA to be written and simulated in a device-independent manner. Further VHDL is written and the testbed configured to transmit and receive bursts of data. A device driver is implemented, and abstract data types are layered on top of the driver, enabling high-level control of the testbed. Single antenna and MIMO data links are implemented using 1x1 binary phase-shift keying (BPSK) and 2x2 Alamouti encoded BPSK modulation respectively. Finally, data packets are transmitted and measured BER performance curves constructed. Channel estimation is proved to work on a 2x2 MIMO channel over-the-air, the introduced loss of Eb/N0 shown to be approximately 0.5 dB compared to perfect channel information. The analogue limitations of the hardware are investigated and bit error rate performance measured as a function of operating point. Finally single antenna communications and a 2x2 Alamouti MIMO scheme are compared over-the-air, the Alamouti scheme delivering a 3 dB improvement in Eb/N0 performance. Satisfyingly the MIMO scheme also exceeds the best case theoretical performance bound of the single antenna case by a margin of 2 dB in Eb/N0.
- Relation
- University of Newcastle Research Higher Degree Thesis
- Date
- 2009
- Keyword(s)
-
FPGA;
field programmable gate array;
smart antenna communications;
MIMO;
multiple-input mulitiple-output
- Resource Type
- thesis
- Rights
- Copyright 2009 John Dalton
- Identifier
- http://hdl.handle.net/1959.13/41758
- Language
- eng
- Full Text
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