Direct-sequence spread spectrum

Direct-sequence spread spectrum

Direct-sequence spread spectrum (DSSS) is a modulation technique used in telecommunications. In this modulation technique, as with other spread spectrum technologies, more bandwidth is occupied by the transmitted signal than the information signal that is being modulated. In Spread spectrum modulation technique the carrier signals occur over the full bandwidth (spectrum) of a device’s transmitting frequency and that is where the name Spread

Features of Direct-sequence spread spectrum

Ø In DSSS a sine wave is pseudo randomly phase-modulated with a continuous string of pseudo noise (PN) code symbols called “chips”. Each of these chips has a much shorter duration than an information bit. In effect information signal is modulated by chips sequence which is much faster. Therefore, the chip rate is much higher than information signal bit rate.

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Ø In DSSS the chip sequences produced by the transmitter to modulate the signal is known at receiver end and receiver uses the same chip sequences to demodulate. As same sequence chips are used at transmitter and receiver, both have to be in sync with respect to chip sequence.