Raptor Codes for Use in Opportunistic Error Correction

Zijnge, T. and Schiphorst, R. and Shao, X. and Slump, C.H. (2010) Raptor Codes for Use in Opportunistic Error Correction. In: 31st Symposium on Information Theory in the Benelux, WIC 2010, 11-12 May 2010, Rotterdam, the Netherlands.

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Abstract:	In this paper a Raptor code is developed and applied in an opportunistic error correction (OEC) layer for Coded OFDM systems. Opportunistic error correction [3] tries to recover information when it is available with the least effort. This is achieved by using Fountain codes in a COFDM system, which means that each subcarrier contains a Fountain coded packet. The property of a Fountain code that any missing packet can be replaced by any other packet allows the receiver to discard packets with low SNR. As a result ADC resolution and therefore energy consumption can be reduced. In this paper the possibilities of using Raptor codes in an OEC system are investigated. Raptor codes are a type of Fountain codes with an efficient encoding and decoding algorithm. By simulating an OEC system on a wireless indoor channel model, it is shown that Raptor codes can save up to 70% in energy consumption with respect to a traditional system. Furthermore it is found that a feedback channel can reduce energy consumption even more. In this setting 85% of energy consumption can be saved.
Item Type:	Conference or Workshop Item
Faculty:	Electrical Engineering, Mathematics and Computer Science (EEMCS)
Research Group:	Signals and Systems (SAS)
Link to this item:	http://purl.utwente.nl/publications/79717
Organisation URL:	http://www.w-i-c.org/
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