Optimal joint source channel coding for scalable video transmission over wireless channels

Abstract

In this paper, a robust and novel approach for optimal bit allocation between source and channel coding is proposed. The proposed approach consists of a wavelet-based scalable video coding framework and a forward error correction method based on the serial concatenation of LDPC codes and turbo codes. Turbo codes shows good performance at low signal to noise ratios but LDPC outperforms turbo codes at high signal to noise ratios. So the concatenation of LDPC and TC enhances the performance at both low and high signal to noise ratios. The scheme reduces the video distortion at the decoder under band-with constraints. The reduction is achieved by efficiently protecting the different quality layers from channel errors. Furthermore, an efficient decoding algorithm is proposed that reduces the decoding complexity of channel decoder. Experimental results clearly show that the proposed approach outperforms conventional forward error correction techniques.