Lucent Technologies Inc.

Suleyman Cenk Sahinalp

Yossi Matias

Shanmugavelayut Muthukrishnan

Michael S Paterson

Grid layouts of switching and sorting networks

A data compression technique for encoding a data stream of symbols processes a current sequence of symbols in the stream using an adaptive look-up table containing strings of different lengths by identifying whether a match of a longest string from the table or a shorter string would produce a lower compression ratio by 'looking ahead' and identifying a match between a next sequence in the data stream and strings in the table. The compression technique identifies those situations where it is advantageous to use a compressed code identifier for a current sequence that is shorter than the longest matching sequence. Such situations exist when the compression ratio achieved for compressing the current sequence in combination with the next sequence in the stream is greater when other than the longest match is employed for the first sequence. A corresponding decompression technique to decode data encoded using a similar 'look ahead' technique is also disclosed.

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Suleyman Cenk Sahinalp