SDR implementation of a OFDM-MIMO receiver
Author
Filippi, Morris
Term
10. term
Education
Publication year
2009
Abstract
This thesis presents a software‑defined radio (SDR) implementation of an OFDM‑MIMO receiver aimed at increasing spectral efficiency while preserving hardware feasibility. It builds on MIMO diversity and techniques such as spatial multiplexing and space‑time coding to raise bit rate within the same power and bandwidth. The core research question is which algorithmic improvements can be used in an OFDM/MIMO receiver without exceeding practical implementation constraints. The work focuses on the challenge of MIMO with more than two transmit antennas, where the product of the channel matrix and its Hermitian is only quasi‑orthogonal, and introduces two techniques to mitigate this issue. The methodology combines theory and model‑driven design (A³ model, Y‑Chart, Attack methodology, and Rugby Meta‑Model), algorithm development and analysis of combining methods for 4x1 and 4x4 configurations (including channel inversion, subtractive combining, and pseudo‑inversion), system modeling aligned with WMAN IEEE 802.16, and implementation in MATLAB, Simulink, and Xilinx System Generator with an FPGA‑oriented architecture (ML506 board), resource estimation, and SW/HW co‑simulation. The report documents the path from problem definition through simulation and co‑simulation; the provided excerpt does not include quantitative results but outlines a route toward a feasible hardware solution and identifies directions for future work.
Denne afhandling omhandler en softwaredefineret radio (SDR) implementering af en OFDM‑MIMO‑modtager med fokus på at øge den spektrale effektivitet uden at kompromittere hardware‑realiserbarheden. Udgangspunktet er MIMO‑diversitet og teknikker som spatial multiplexing og space‑time coding, der kan øge bitraten inden for samme effekt og båndbredde. Det centrale forskningsspørgsmål er, hvilke algoritmiske forbedringer der kan anvendes i en OFDM/MIMO‑modtager, så den forbliver implementerbar på hardware. Arbejdet adresserer særligt udfordringen ved MIMO med mere end to sendeantenner, hvor produktet af kanalmatricen og dens hermitisk konjugerede kun er kvasi‑ortogonalt, og introducerer to teknikker til at afhjælpe dette. Metoden omfatter teori og modeldrevet design (A³‑model, Y‑Chart, Attack‑metode og Rugby Meta‑Model), algoritmeudvikling og analyse af kombineringsmetoder for 4x1 og 4x4 konfigurationer (bl.a. kanalinversion, subtraktiv kombinering og pseudo‑inversion), systemmodellering i overensstemmelse med WMAN IEEE 802.16, samt implementering i MATLAB, Simulink og Xilinx System Generator med FPGA‑orienteret arkitektur (ML506‑kort), ressourceestimering og SW/HW‑co‑simulering. Rapporten beskriver trin fra problemformulering til simulering og co‑simulering; den medtagne tekst indeholder ikke kvantitative resultater, men viser en vej til en realiserbar hardwareløsning og peger på fremtidigt arbejde.
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