Opportunistic error correction for OFDM-based DVB systems

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    Abstract

    DVB-T2 (second generation terrestrial digital video broadcasting) employs LDPC (Low Density Parity Check) codes combined with BCH (Bose-Chaudhuri-Hocquengham) codes, which has a better performance in comparison to convolutional and Reed-Solomon codes used in other OFDM-based DVB systems. However, the current FEC layer in the DVB-T2standard is still not optimal. In this paper, we propose a novel error correction scheme based on fountain codes for OFDM-based DVB systems. The key element in this new scheme is that only packets are processed by the receiver which has encountered high-energy channels. Others are discarded. To achieve a data rate of 9.5 Mbits/s, this new approach has a SNR gain of at least 10 dB with perfect channel knowledge and 11 dB with non-perfect channel knowledge in comparison to the current FEC layer in the DVB-T2standard. With a low-complexity interpolation-based channel estimation algorithm, opportunistic error correction offers us a QEF (Quasi Error Free) quality with a maximum DF(Doppler Frequency) of 40 Hz but the current DVB-T2 FEC layer can only provide a BER of 10−7 quality after BCH decoding with a maximum DF of 20 Hz.
    Original languageUndefined
    Pages (from-to)344-352
    Number of pages9
    JournalCommunications and network
    Volume5
    Issue number4
    DOIs
    Publication statusPublished - Nov 2013

    Keywords

    • EWI-24031
    • IR-88496
    • METIS-300184

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