DESIGN METHOD AND APPARATUS FOR TURBO INTERLEAVER BY USING PN SEQUENCE

摘要

PURPOSE: A design method and apparatus for turbo interleaver by using the random characteristics of a PN sequence is provided to maximize the performance with minimum memory. CONSTITUTION: Turbo codes are binary error-correcting codes built from the parallel concatenation of two recursive systematic convolutional codes and are used as a feedback decoder. A design method for a turbo interleaver in a cellular communication system using turbo codes comprises the steps of: assigning PN sequence code into the column bits and bit reversing of the row bits of the interleaver; assigning the initial index to the current column and generating the PN sequence corresponding to the current column length; and initializing the next column within the range of current PN sequence generation. The apparatus for the turbo interleaver comprises a counter(110), a bit reverse part(120), a linear feedback shift register(130), and a column initial index(100).