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In telecommunications, direct-sequence spread spectrum (DSSS) is a spread-spectrum modulation technique primarily used to reduce overall signal interference. The direct-sequence modulation makes the transmitted signal wider in bandwidth than the information bandwidth.
A tutorial overview of spread spectrum principles. Covers both direct sequence and fast hopping methods. Theoretical equations are given to allow performance estimates.
Direct Sequence Spread Spectrum (DSSS) is a communication system that was developed in the 1980s. It divides the bandwidth of a radio channel into wide frequency bands and transmits these signals over separate frequencies.
Spectral plots illustrate direct-sequence spread-spectrum (DSSS) and frequency-hopping spread-spectrum (FHSS) methods. As spread-spectrum techniques become increasingly popular, electrical engineers outside the field are eager for understandable explanations of the technology.
In this lecture we consider direct-sequence spread-spectrum systems. Unlike frequency-hopping, a direct-sequence signal occupies the entire bandwidth continuously.
In this chapter we consider direct-sequence spread-spectrum systems. Unlike frequency-hopping,a direct-sequence signal occupies the entire bandwidth continuously. The signal is obtained by starting with a narrowband signal and directly modulating a high bandwidth signal.
The most well-known and widely employed spread spectrum modulation technique, direct sequence makes use of noise-like sequences in order to spread the bandwidth of an information signal. It is this spreading that characterizes spread spectrum and yields the benefits of such modulation. The heart of direct sequence lies in the noise-like sequences.
Direct sequence spread spectrum (DSSS) differs from FHSS in that the transmitted data packet is “spread” across a wide channel, effectively transmitting on multiple narrow channels simultaneously.
Direct Sequence Spread Spectrum (DSSS) Each bit in original signal is represented by multiple bits in the transmitted signal Spreading code spreads signal across a wider frequency band oSpread is in direct proportion to number of bits used One technique combines digital information stream with the spreading code bit stream using exclusive-OR
Direct sequence spread spectrum (DSSS) is a modulation technique used in telecommunications where the signal is spread over a wider bandwidth than the minimum necessary.