SPEECH CODING AND ADAPTIVE CHANNEL CODING TECHNIQUE FOR MEMORY AND MEMORYLESS CHANNELS

Adaptive joint H.263-channel coding for memoryless binary channels

The main purpose of this paper is to show that once the video source coding is dependent on the channel characteristics, better performance can be achieved in terms of reconstructed video quality. Our study considers a fixed overall bit rate transmission of 64 kbit/s over error prone memoryless binary channels and the source coder is the ITU-T H.263 video standard. The variable H.263 source cod...

Coding and decoding for time-discrete amplitude-continuous memoryless channels

In this report we consider some aspects of the general problem of encoding and decoding for time-discrete, amplitude-continuous memoryless channels. The results can be summarized under three main headings. 1. Signal Space Structure: A scheme for constructing a discrete signal space, for which sequential encoding-decoding methods are possible for the general continuous memoryless channel, is des...

Adaptive source-channel subband video coding for wireless channels

This paper presents a general framework for combined source-channel coding within the context of subband coding. The unequal importance of sub-bands in reconstruction of the source is exploited by an appropriate allocation of source and channel coding rates for the coding and transmission of subbands over a noisy channel. For each subband, the source coding rate as well as the level of protecti...

Channel Coding Techniques for Adaptive Multi Rate Speech Transmission

A variable channel coding scheme for Adaptive Multi Rate (AMR) speech transmission over mobile radio channels is proposed. Although it was developed for the GSM (Global System for Mobile Communications), the basic concept of variable channel coding can be adopted to other digital radio systems. The new AMR concept allows almost wire-line speech quality even for poor channel conditions by dynami...

A coding theorem for the discrete memoryless broadcast channel