In direct sequence/code division multiple access (DS/CDMA) communication system, different users employ distinct spreading codes but transmit at the same time and frequency.

• 在直接序列扩频码分多址(DS/CDMA:direct sequence/code division multiple access)通信系统中，不同用户指定不同的扩频码波形，不同用户的信号在同一频带内同时传输。