SOURCE CODED MODULATION FOR DISCRETE SOURCES WITH MEMORY

Document Type : Article

Authors

1 Dept. of Electrical Engineering Malek Ashtar University of Technology

2 Dept. of Electrical Engineering K. N. Toosi University of Technology

3 Faculty of Electrical EngineeringSharif University of Technology

Abstract

For a source with memory, the outputs of the source are not independent and, therefore, previous outputs reveal some information about future ones. These redundancies are hidden in output sequences, and cannot be used for improving the error performance of communication systems. In this paper, we present a new joint source-channel coding scheme for sources with memory, called source coded modulation. Source coded modulation is a scheme in which source characteristics are used to provide error protection, via an appropriate signal assignment, to each symbol of the source. In this scheme, we use the source transition matrix to plot a trellis diagram and, then, we propose an algorithm for mapping a given signal constellation on branches of this diagram, based on source statistical characteristics. Finally, we investigate a method to determine the maximum achievable error protection by using the source redundancy. Simulation results show that the proposed scheme can obtain a robust and error-resistant performance over AWGN channels, proportional to the source redundancy.

Keywords

Sharif Journal of Civil Engineering
vol. 25, No. 52
Electrical Engineering
January 2010
Pages 31-36

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