Direct-sequence spread spectrum: Difference between revisions

Revision as of 14:34, 20 May 2006

Revision as of 19:52, 20 May 2006

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# for generating spread-spectrum transmissions by [[Phase modulation|phase-modulating]] a [[sine wave]] [[pseudorandom]]ly with a continuous [[string (computer science)|string]] of [[pseudonoise]] [[code]] symbols, each of duration much smaller than a [[bit]].

# A [[Signaling (telecommunication)|signal]] structuring technique utilizing a [[digital]] code [[sequence]] ([[PN Sequences]]) having a [[chip rate]] much higher than the [[information]] signal [[bit rate]]. Each information bit of a [[digital signal]] is transmitted as a pseudorandom sequence of chips.

DSSS works on 11 channels which are set 5 MHz apart and each channel takes 20 MHz for its transmission so this way we have got three non-overlapping channels(Which have minimum Interference) these are 1, 6, 11.

Put simply, direct-sequence spread-spectrum transmissions multiply the data being transmitted by a "noise" signal. This noise signal is a pseudorandom sequence of <code>1</code> and <code>−1</code> values, at a frequency much higher than that of the original signal, thereby spreading the energy of the original signal into a much wider band.