Opportunistic Error Correction for OFDM-Based DVB Systems

Xiaoying Shao, Cornelis H. Slump

Signals and Systems Group, University of Twente, Enschede, The Netherlands.

DOI: 10.4236/cn.2013.54043                

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.

Keywords

DVB-T2; LDPC; BCH; Convolutional; Reed-Solomon Codes; OFDM; Fountain Codes

Conflicts of Interest

The authors declare no conflicts of interest.

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