Error Robustness Scheme for Scalable Video Based on the Concatenation of LDPC and Turbo Codes
In this paper, a novel approach for transmission of scalable video over wireless channel is proposed. The proposed approach jointly optimises the bit allocation between a wavelet-based scalable video coding framework and a forward error correction codes. The forward error correction codes is based on the serial concatenation of LDPC codes and turbo codes. Turbo codes shows good performance at high error rates region but LDPC outperforms turbo codes at low error rates. So the concatenation of LDPC and TC enhances the performance at both low and high signal to noise ratios. The scheme minimizes the reconstructed video distortion at the decoder subject to a constraint on the overall transmission bitrate budget. The minimization is achieved by exploiting the source rate distortion characteristics and the statistics of the available codes. Furthermore, an efficient decoding algorithm is proposed. Experimental results clearly demonstrate the superiority of the proposed approach over conventional forward error correction techniques.