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2. EXPERTSYSTEMSANDSOLUTIONS

3. 48, North Street, Aranarai, Perambalur, Tamil Nadu, India.
Email ID: expertsyssol@yahoo.com,
Website: www.researchprojects.info
Phone: 9952749533,
VHDL IMPLIMENTATION OF LZW COMPRESSION ALGORITHM
Abstract
The adaptive Lempel-Ziv-Welch general-purpose algorithm and its implementation
suitable for packet radio telephone transmission, and archival storage. While the statistical variable-
length Huffman technique compresses text by 20%,the LZW technique can compress data (text,
numeric, mixed, and bit-mapped images)by 40 to 60%.
The adaptive LZW algorithm has very simple logic, leading to inexpensive and fast
implementations. Good LXW implementations use 9- to 16-bit codes, handling most applications.A12-bit
code is suitable for medium-size files. Efficiency improves with larger codes. A tight coding of the
algorithm can compress 75 Kbytes in a second on a 1-MIPS machine.
This project is implemented using VHDL &simulation results are verified. It encourages
concurrent development in the area of data compression. The further enhancement of this project is to
achieve more percentage of compression with less hardware.