What is CDM (code division multiplexing)?

Code division multiplexing (CDM) is a systems administration strategy in which numerous information signals are joined for simultaneous transmission over a common frequency band. When CDM is utilized to permit numerous users to share the same communications channel, the technology is called code division multiple access. CDMA utilizes a spread-spectrum that was created in World War II to prevent enemies from jamming transmissions. An information signal is transmitted over a range of frequencies in an assigned frequency spectrum.