 The chipping code is combined with the data using exclusive or before transmitting using binary phase-shift keying or a similar modulation method.The resulting signal has a higher bandwidth than the data, and therefore this is a method of spread-spectrum communication.When used only for the spread-spectrum property, this technique is called direct-sequence spread spectrum; when used to distinguish several signals transmitted in the same channel at the same time and frequency, it is called code division multiple access.