Analysis of selected implementation issues of a dynamic spectrum allocation algorithm for OFDM systems
Author
Tonelli, Oscar
Term
10. term
Education
Publication year
2009
Pages
93
Abstract
This thesis investigates selected implementation issues of a dynamic spectrum allocation algorithm for OFDM systems in emerging 4G/IMT‑A contexts, where high data rates and wide bandwidth may lead to shared spectrum and dynamic network deployments. The goal is to enable fair and efficient resource sharing among operators and to assess practical feasibility on FPGA. The algorithm is based on the WiMAX IEEE 802.16e‑2004 OFDM PHY and is first validated in a simplified channel and transmission environment using Matlab/Simulink. Selected functions are then implemented with Xilinx System Generator to analyze hardware costs in terms of area and execution time on a Virtex‑5 FPGA (Xilinx ML506). Results indicate that the examined functions are not highly demanding, while input port requirements emerge as a critical parameter. The work also outlines the simulation and implementation setup, validation steps, and directions for future optimization.
Dette speciale undersøger udvalgte implementeringsmæssige udfordringer ved en dynamisk spektrumallokeringsalgoritme for OFDM-systemer i kommende 4G/IMT‑A miljøer, hvor høje datahastigheder og bred båndbredde kan føre til fælles spektrumsbrug og dynamiske netværksudrulninger. Formålet er at vurdere, hvordan ressourcer kan fordeles retfærdigt og effektivt mellem operatører, samt at klarlægge den praktiske gennemførbarhed på FPGA. Algoritmen er baseret på WiMAX IEEE 802.16e‑2004 OFDM PHY og valideres først i et forenklet kanal- og transmissionsmiljø i Matlab/Simulink. Udvalgte funktioner implementeres derefter med Xilinx System Generator for at analysere hardwareomkostninger i form af areal og eksekveringstid på en Virtex‑5 FPGA (Xilinx ML506). Resultaterne indikerer, at de undersøgte funktioner ikke er særligt ressourcekrævende, men at kravene til inputporte er en kritisk parameter. Arbejdet præsenterer desuden simulerings- og implementeringsopbygning, validering og perspektiver for videre optimering.
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