Raptor Codes for Use in Opportunistic Error Correction

T. Zijnge, Roelof Schiphorst, X. Shao, Cornelis H. Slump

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    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.
    Original languageEnglish
    Publication statusPublished - 2010
    Event31st WIC Symposium on Information Theory in the Benelux 2010 - Rotterdam, Netherlands
    Duration: 11 May 201012 May 2010
    Conference number: 31


    Conference31st WIC Symposium on Information Theory in the Benelux 2010


    • IR-79717


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