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Known as the code division multiple access (DS-CDMA) in proper order directly too directly Order last expansion frequency spectrum signal one of method of modulation that send of figure above radio broadcasting. Expand frequency spectrum according to the direct order, the small stream of the information conveyed is divided into smallly, each one is passed and assigned to to cross a frequency channel of the range. Close to data signal and a high speed datum and some orders of carrying (know as a cracked code too) It combine together that divide count rate that travel according to. If the data location is damaged during sending, the surplus cracked code helps the signal to resist and interfere with and enable the initial data to resume.
Form and compare with other spectral course of expansion known as frequency with jumping to expand frequency spectrum in proper order directly, or the code division multiple access (FH-CDMA) jumps Frequency,divide pieces of bandwidth wide range thin slices into into much broadcast frequencies possible. Usually, the apparatus of frequency jumps to use less power and cheaper, but the performance of DS-CDMA system is usually better and more reliable.

The first of the expansion frequency spectrum is by the extensive application of those armies, because it is difficult to be resisted and blocked and attempting to do by wideband signal and that found to use. In recent years, researchers have already transferred their attention to the commercial purpose, especially the wireless network of some areas uses and expands the spectral course.