A pseudorandom code is added to the data signal that increases the modulation rate and signal bandwidth.
DS Spread Spectrum is a RF technology that uses one to three 22MHz wide channels. Typically only one channel is used at a time. Other channels can be used when interference is an issue. DSSS provides a larger range and throughput than FHSS. DSSS is typically more costly than FHSS. DSS is more susceptible to interference than FHSS.
A spread spectrum modulation technique where a pseudo-random code directly phase modulates a carrier, increasing the bandwidth of the transmission. The resulting signal has a noise-like spectrum. The signal is despread by correlating with a pseudo-random code identical to and in synchronization with the code used to spread the carrier at the transmitter.