Potential for Secondary Communication in Existing Wireless Systems
Authors
Constantin, Mirela ; Rozsondai, Adrian Marcel
Term
10. term
Publication year
2011
Submitted on
2011-01-14
Pages
82
Abstract
Dette projekt undersøger, om man kan tilføje et sekundært kommunikationslag til eksisterende trådløse systemer uden at forstyrre den primære kommunikation. Ideen er at omrokere, hvordan brugernes ressourcer placeres i hver dataramme, så der kan sendes ekstra information, mens hovedtrafikken forbliver uændret. For at gøre dette robust konstrueres permutationstabeller, der opfylder krav til Hamming-afstand—så forskellige omrokeringer er tilstrækkeligt forskellige til at modstå fejl—og der udvikles en fejlrettende kode til at genskabe den sekundære data. To teknologier undersøges: WiFi og WiMAX. For WiFi gennemgås flere rammetyper, og den mest velegnede bruges til at anvende og vurdere sekundær kommunikation. For WiMAX opstilles to scenarier, og potentialet analyseres i hvert af dem med hensyn til rækkevidde og antal brugere. Analysen kombinerer beregninger og dataanalyse med simuleringer implementeret i MATLAB. Afhandlingen afsluttes med en oversigt og en resultatopsummering, der fremhæver fordelene ved sekundær kommunikation.
This thesis explores whether a secondary layer of communication can be added to existing wireless systems without disturbing the primary communication. The approach is to subtly reorder how users’ resources are arranged within each data frame so that extra information can be carried while the main traffic remains unaffected. To make this reliable, the work designs permutation tables that meet Hamming distance constraints—so different reorderings are distinct enough to resist errors—and develops an error-correcting code to recover the secondary data. The study focuses on two technologies: WiFi and WiMAX. For WiFi, several frame types are examined, and the most suitable one is used to apply and evaluate secondary communication. For WiMAX, two scenarios are defined, and the potential is analyzed in each with respect to coverage range and number of users. The analysis combines calculations and data analysis with simulations implemented in MATLAB. The thesis concludes with an overview and a summary of results that highlight the benefits of secondary communication.
[This abstract was generated with the help of AI]
Keywords
Documents