We investigate joint network and channel coding schemes for networks when relay nodes are not capable of performing channel coding operations. Rather, channel encoding is performed at the source node while channel decoding is done only at the destination nodes. We examine three different decoding strategies: independent network-then-channel decoding, serial network and channel decoding, and joi...

This thesis addresses the problems of signal processing for image communication and restoration. Significant attention is devoted to developing novel stochastic models for images, investigating the information theoretic performance bounds for them, and designing efficient learning and inference methods for the proposed models. Unlike the commonly accepted approach in which the design of communi...

Digital speech transmission systems use source coding to reduce the bit rate and channel coding to correct transmission errors. Furthermore, in periods of a very poor channel quality error concealment of residual bit errors becomes necessary as channel decoding fails. However, if the channel is clear, channel coding would not be required at all and the speech quality could be improved by allowi...

In this paper we propose a low-complexity errorresilient and joint source-channel video coding algorithms for video codec based on three-dimensional discrete wavelet transform (3-D DWT). First, we show that the video stream, generated by 3-D DWT codec with the proposed error-resilient, is significantly more robust to packet losses than video stream generated by scalable extension of the H.264/A...

Two common source-channel coding strategies, joint and tandem, are compared on the basis of distortion vs. complexity and distortion vs. delay by analyzing specific representatives of each when transmitting analog data samples across a binary symmetric channel. Channel-optimized transform coding is the joint source-channel strategy; transform coding plus Reed-Solomon coding is the tandem strate...

A joint source-channel coding scheme (JSCCS) used in applications, like sending images, voice, music etc. over internet/ wireless networks, involves source coding to compress the information and channel coding to detect/ correct errors, introduced by the channel. In this paper, we investigate the unequal error protection (UEP) capability of a class of low-density parity-check (LDPC) codes in a ...

In this paper, a joint source-channel coding with power control technique is proposed that will minimize the average end-to-end distortion amongst all users, subject to a constraint on the total bit rate used for source and channel coding. Each user in the system is arbitrarily assigned either a low-motion or a high-motion video sequence to transmit. To reduce the computational complexity of th...