Enabling the Spectral Efficient Coexistence of Device to Device and Device to Infrastructure communications through Opportunistic Interference Cancellation
Authors
Saez Gil, Enrique ; Buendia, Andres Gil
Term
4. term
Education
Publication year
2014
Submitted on
2014-06-04
Pages
111
Abstract
Nye mobilnet står over for en grundlæggende flaskehals: radiospektret er begrænset, mens flere og flere enheder vil sende data. Denne afhandling undersøger, om to forskellige radioadgangssystemer kan fungere i det samme frekvensbånd uden at forstyrre hinanden. Med afsæt i den eksisterende litteratur foreslår vi en interferensannulleringsmetode – en signalbehandlingsteknik, der identificerer og fjerner uønsket energi fra det andet system – så de to systemer kan dele kanalen. Vi vurderer metoden med både computersimuleringer og en praktisk implementering for at se, hvordan den præsterer, og om den kan fungere uden for laboratoriet. Resultaterne viser, at hvis annulleringen anvendes i den ene eller begge ender af kommunikationsforbindelsen (senderen og/eller modtageren), muliggør den sameksistens på en enkelt frekvens og giver en betydelig kapacitetsforøgelse. Afhandlingen skitserer også retninger for fremtidige forbedringer og forskning, der kan gøre sådan deling mere robust og lettere at tage i brug.
New mobile networks face a basic bottleneck: the radio spectrum is limited while more and more devices want to send data. This thesis explores whether two different radio access systems can operate in the same frequency band without disrupting each other. Building on existing research, we propose an interference cancellation method—a signal processing technique that identifies and removes unwanted energy from the other system—so the two systems can share the channel. We evaluate this method with both computer simulations and a practical implementation to assess its performance and whether it could work outside the lab. The results show that applying the cancellation at one or both ends of the communication link (the transmitter and/or the receiver) enables coexistence on a single frequency and yields a significant increase in capacity. The thesis also outlines directions for future improvements and research to make such spectrum sharing more robust and easier to deploy.
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