Two-Level Unequal Error Protection Coding for LZW Compressed Data
XU Hong-chuan · Telecommunication Engineering · 2002
LZW data compression coding proposed by T.A. Welch based on Ziv-Lempel coding is widely used for text compression. Error control for compressed data is necessary in applications because compressed data is highly susceptible to errors. This paper analyzes the effects of errors on LZW coding. It shows that for LZW coding, the first part of the compressed data used to re-construct the dictionary is much more important than other data, therefore, is more strongly protected by using Unequal Error Protection (UEP) scheme. Simulation results show that the proposed UEP scheme can more efficiently control errors than conventional error control codes.