CDMA (Code Division Multiple Access) is the fundamental of the spread spectrum multiple access in transmitting digital signal with over a carrier wave. In transmitter side of the CDMA system, the digital data is coded with a pseudo-noise (PN) noise sequence and modulated with different modulation techniques and transmit in spread spectrum, while the receiver side, despread the spread spectrum with that particular (PN) code, then demodulated, filtered and compared with the desired signal.