Design and Implementation of DSSS-CDMA Transmitter and Receiver for Reconfigurable Links Using FPGA
Direct Sequence Spread Spectrum (DSSS), is also called as Direct Sequence Code Division Multiplexing Access (DS-CDMA). In direct sequence spread spectrum, the stream of information to be transmitted is divided into small pieces, each of which is allocated across to a frequency channel across the spectrum. A data signal at the point of transmission is combined with a higher data-rate bit sequence (also called chipping code) that divides the data according to a spreading ratio. The redundant chipping code helps the signal resist interference and also enables the original data to be recovered if data bits are damaged during the transmission. Direct sequence contrasts with the other spread spectrum process, known as frequency hopping spread spectrum.