Direct Sequence Spread Spectrum Communications (DSSS) is a transmission method of digital data that uses a pseudo-random noise spreading code.
Direct Sequence Spread Spectrum Communications:
The transmission signal produced by spread spectrum modulation techniques has a bandwidth that is significantly larger than the original information bandwidth. A pseudo-noise (PN) sequence is used to modulate the information bits in a direct sequence spread spectrum (DSSS) communications system prior to transmission. The spread spectrum signal is "despreaded" at the receiver by correlating it with a local copy of the PN code. The desirable information component of the received signal contracts to its original bandwidth as a result of the correlation process, which also spreads the narrow band interference over the PN signal's bandwidth.
Serial and parallel transmission are the two techniques used to transfer data between digital devices. Data bits are transmitted serially across a single channel one after the other. Multiple data bits are sent simultaneously over several channels during parallel data transfer.
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