CDMA IS A SCHEME IN WHICH MULTIPLE USERS ARE ASSIGNED RADIO RESOURCES USING THE DIRECT SEQUENCE – SPREAD SPECTRUM (DSSS) TECHNIQUES.
ALTHOUGH ALL USERS ARE TRANSMITTING IN THE SAME RF BAND, ALL USERS ARE SEPARATED FROM EACH OTHER VIA THE USE OF ORTHOGONAL CODES (WALSH CODE).
EACH USER HAS FULL TIME USE OF THE ENTIRE SPECTRAL ALLOCATIONS.
EACH USER’S SIGNAL ENERGY IS SPREAD OVER THE ENTIRE BANDWIDTH AND CODED SO AS TO  APPEAR LIKE BROADBAND NOISE TO EVERY OTHER USER.