In this paper, we develop an approach toward joint source-channel coding for motion-compensated DCT-based scalable video coding and transmission. A framework for the optimal selection of the source and channel coding rates over all scalable layers is presented such that the overall distortion is minimized. The algorithm utilizes universal rate distortion characteristics which are obtained exper...

For The Enhancement of BER In Communication System We Use The Different Type of Channel coding. LDPC(low density parity check) are the codes Which are used in channel coding for the different enhancement in the system performance. We are trying LDPC channel coding with BPSK modulation scheme with MRC and EGC at the receiver over Rayleigh fading channel. BER Performance of System is analyzed wit...

A general method of coding over expansion is proposed, which allows one to reduce the highly non-trivial problems of coding over analog channels and compressing analog sources to a set of much simpler subproblems, coding over discrete channels and compressing discrete sources. More specifically, the focus of this paper is on the additive exponential noise (AEN) channel, and lossy compression of...

We discuss several aspects of coding for the asymmetric channel, with emphasis on iterative coding. We implement turboand LDPC decoders for the Z-channel, and a novel coding scheme designed to approach the optimum input distribution for the channel. Index terms Z-channel, iterative decoding, channel capacity.