Fountain codes for frequency occupancy information dissemination


Shao, X. and Cronie, H.S. and Hoeksema, F.W. and Slump, C.H. (2006) Fountain codes for frequency occupancy information dissemination. In: 17th Annual Workshop on Circuits, 23-24 Nov 2006, Veldhoven, The Netherlands.

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Abstract:Cognitive radio (CR) is defined as an intelligent
wireless communication system based on secondary utilization of
an already licensed frequency band. In order to communicate
without interfering the legal users (primary users), cognitive
radio nodes should have the same overview of the spectrum
occupancy information. In other words, each cognitive radio node
should disseminate frequency occupancy information (FOI) to
other CR nodes reliably after sensing the environment.
Normally, people employ retransmission protocols to communicate
reliably. This leads to redundancy in reliable dissemination,
especially in a multicasting or broadcasting situation. However,
the application of fountain codes could make reliable dissemination
possible without too much redundancy.
A fountain-code based approach is more efficient than using
retransmission protocols for disseminating large-sized file. In the
paper we show this is also the case when applying fountain codes
in disseminating a small FOI file (e.g. a binary vector originating
from a 512 points FFT).
Fountain codes only work optimally in an erasure channel.
In the paper we show the utilization of error-correcting codes
to convert a noisy channel into an erasure channel.
Item Type:Conference or Workshop Item
Electrical Engineering, Mathematics and Computer Science (EEMCS)
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