Multiple access is an important consideration in the design and implementation of wireless communications systems. Code division multiple access (CDMA) is one method for providing multiple access in a wireless system. In CDMA, each user is assigned a unique code that identifies the user to the system. This code is used to modulate and demodulate the userâ s data. CDMA has several advantages over other more traditional multiple access methods like frequency-division multiple access (FDMA) and time-division multiple access (TDMA), one of the most important being its inherent noise-rejection capability. Because of its advantages over other multiple access methods, CDMA is being designed into many current and next-generation wireless systems.