Data interleaver and method of interleaving data

Details Data interleaver and method of interleaving data Data interleaver and method of interleaving data

H - Electricity

04

L

H04L 1/00 (2006.01) H03M 13/27 (2006.01)

Patent

CA 2266283

Interleaving of data symbols comprises permuting rows and columns of a matrix of N r rows and N c columns, in which data symbols to be interleaved are represented row by row, in accordance with: Row Permutation I r(k) = [.alpha.T k + f c(1)]modN r Column Permutation I c(l) = [.alpha.c l + f r(k)]modN c where I r(k) represents a data symbol with a row index k, k is an integer from 1 to N r, .alpha. r. is an integer, f c(1) is a non-zero function of a column index 1,1 is an integer from 1 to N c, I c(1) represents a data symbol with the column index 1, .alpha.c is an integer, f r(k) is zero or a function of the row index k, and modN r and modN c represent modulo-N r and modulo-N c arithmetic respectively, interleaved data symbols being derived from the matrix column by column. A data interleaver comprises a memory for sequentially storing data symbols to be interleaved and a relatively simple circuit for determining read addresses for the interleaved data symbols the data interleaver is particularly suited for channel interleaving in a 3rd generation CDMA wireless communications system.

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