TWO DIMENSIONAL INTERLEAVE PROCESS FOR CDMA TRANSMISSIONS OFONE DIMENSIONAL TIMESLOT DATA SIGNAL

摘要

A method and apparatus for interleaving symbols from a one dimensional TDMA 802.14 or MCNS minislot or other TDMA stream into two dimensional arrays in code and time for transmission on a code division multiplexed digital data transmission system. There are two methods disclosed. The first calculates i and j values for storage in RAM as a function of the symbol index in the TDMA stream, the number of codes to be employed, the column space design parameter representing the number of columns in the array, i.e., symbol times, that could be adversely affected by burst noise, and a calculated total number of columns in the array. The result is an array in which no indices of two symbols within any column or between columns of the column space are closer together than a design parameter vertical distance. The other method is similar but interleaves on both a column space as well as a row space so as to spread out the effects of both burst noise and intercode interference so that any errors that result are within the range of the redundant ECC bits to detect and correct.