What is Direct Sequence Spread Spectrum (DSSS)?
Direct-Sequence Spread-Spectrum (DSSS) is a spread spectrum modulation scheme that generates a redundant bit pattern for each transmitted bit. The bit pattern, called a chip or chipping code, enables receivers to filter out signals that don’t use the same bit pattern, including noise or interference. The chipping code serves two primary functions: 1) It identifies the data so that the receiver can recognize it as belonging to a certain transmitter. The transmitter generates the chipping code and only receivers that know the chipping code can decipher the data. 2) The chipping code spreads the data across the available bandwidth. Longer chips require more bandwidth but allow a greater probability that the original data can be recovered. Even if one or more bits in the chip are damaged during transmission, technology embedded in the radio can recover the original data using statistical techniques without the need for retransmission. Unintended narrowband receivers ignore DSSS signals as
