Abstract: A CDMA transmission system wherein a data sequence which is to be transmitted is frequency band spread by multiplying the data words therein by selected code words. In order to minimize the necessary bandwidth, a frame structure is established and the spread spectrum data words are compressed into data bursts each of which is included in one or more time slots of a data frame. Within a frame a data burst is located at a particular time delay t.sub.0 following commencement of the frame and has a duration t.sub.d corresponding to the bit rate of the data burst.