Dynamic Reconfiguration of Link Adaptation algorithms for a Multi Carrier System
Authors
Chitti, Sri Hanuma ; Kulkarni, Gaurav
Term
10. term
Publication year
2007
Pages
95
Abstract
Formålet med projektet er at vurdere, om dynamisk delvis rekonfiguration (PR) af en FPGA kan bruges til linkadaptation (LA) i et OFDM-system som WiMAX. En FPGA er en omprogrammerbar chip, og delvis rekonfiguration gør det muligt at udskifte dele af designet under drift, så den samme chip kan genbruge hardwareareal. Tidligere blev to LA-algoritmer, SRA og SAMPDA, implementeret. De leverede samme ydeevne under visse forhold, men brugte markant forskelligt hardwareareal. Det peger på, at man potentielt kan spare ressourcer ved at skifte mellem dem efter behov. Projektet introducerer metoden ATtACk, en trinvis fremgangsmåde til systematisk at nærme sig en PR-baseret løsning, og følger en proces på tværs af tre domæner for at vurdere implementeringsmuligheder. Et live-setup måler signal-støj-forholdet (SNR), som bruges til at vælge, hvilken algoritme der skal køre. Retningslinjer for PR gennemgås først. På den valgte FPGA-udviklingsplatform forhindrede praktiske begrænsninger—pinforbindelser, arkitekturmæssige forhold og den nødvendige hardwarestørrelse—en fuld PR-implementering. I stedet blev hver del af designet implementeret separat, begrænsningerne blev analyseret, og ændringer blev foreslået. Overvejelser om, hvad der kræves for en praktisk rekonfigurerbar LA, diskuteres også. Konklusionen er, at et PR-system, der kan skifte mellem SRA og SAMPDA, er muligt, forudsat at der foretages yderligere arkitektoniske ændringer og optimeringer af algoritmerne.
This project evaluates whether dynamic partial reconfiguration (PR) of an FPGA is feasible for Link Adaptation (LA) in an OFDM system such as WiMAX. An FPGA is a reprogrammable chip, and partial reconfiguration lets you swap parts of the design while the system runs, allowing the same chip area to be reused. Two LA algorithms, SRA and SAMPDA, had previously been implemented. Under certain conditions they delivered similar performance but required very different hardware areas, suggesting resource savings if the system could switch between them as needed. The project proposes ATtACk, a step-by-step method to systematically work toward a PR-based solution, and follows a staged process across three domains to assess feasibility. A live setup measures the signal-to-noise ratio (SNR), which is used to choose which algorithm to run. PR guidelines are reviewed first. On the chosen FPGA development board, practical constraints—pin connections, architectural limits, and the size of the required hardware modules—prevented a complete PR implementation. Instead, each part of the design was implemented separately, the limitations were analyzed, and changes were proposed. The project also discusses what a practical reconfigurable LA would entail. The conclusion is that a PR system switching between SRA and SAMPDA is achievable, provided further architectural changes and algorithm optimizations are made.
[This abstract was generated with the help of AI]
Documents