Method and device of spread spectrum communication for code division multiple access (CDMA) system

The invention discloses a method and a device of spread spectrum communication for a code division multiple access (CDMA) system. The method comprises obtaining four fundamental sequences according to combinations of two values of high-low electrical level codes; generating a spread spectrum sequence collection with code length of 2N through processing of N-2 levels, dividing two sequence units of the collection in a spread spectrum sequence obtained after last level processing as a group when the jth level processing is carried out, obtaining a spread spectrum sequence collection composed of orthometric spread spectrum sequences with code length of 2j+2 by combining the two sequence units a1 and a2 of each group of a last level according to set disciplines sequentially, wherein when the first level processing is carried out, the fundamental sequences are used as sequence units, and sequence units used by each follow-up level contain 2j or 2j+1 values of high-low electrical level codes; and using generated spread spectrum sequences to carry out spectrum spreading processing on transmission data to achieve the spread spectrum communication. The method and the device of spread spectrum communication for the CDMA system can reduce intersymbol interference and capacity losses brought by multi-path interference, and therefore rapid data transmission can be achieved.