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Performance of Cooperative Relay Protocols over an Audio Channel
Linköping University, Department of Electrical Engineering, Communication Systems.
2009 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

In wireless transmissions the communication is often degraded by random fades, noise and other performance reducing phenomena. One way of improving the stability and reducing the error rates is to use relaying techniques where several nodes cooperate in a transmission between two of them. This thesis analyzes some of the available Decode-and-Forward relaying schemes for wireless transmission. The investigated schemes are conventional repetition coding, partial repetition coding and non-collaborative direct transmission. I have developed a three-node communication system using an audio channel to test the performance of repetition coding and direct transmission. This audio communication system can also be used to demonstrate some basic phenomena in wireless transmissions and how different scenarios change the performance of the communication. A theoretical performance analysis and computer simulations of the schemes performance over a Rayleigh fading channel are done as a basis for comparison. As a result we see that in the audio communication system repetition coding actually degrades the performance, compared to direct transmission, when using a relatively slow data rate in comparison to the speed of the fading in the audio channel.

Place, publisher, year, edition, pages
2009. , 68 p.
Keyword [en]
Relay, Cooperative transmission, audio channel
National Category
Engineering and Technology
URN: urn:nbn:se:liu:diva-19629ISRN: LiTH-ISY-EX- -09/4267 - - SEOAI: diva2:228951
Subject / course
Communication Systems
2009-05-26, Algoritmen, Linköpings Universitet, Linköping, 10:00 (English)
Available from: 2009-08-19 Created: 2009-07-03 Last updated: 2011-07-08Bibliographically approved

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Wärme, Thomas
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