Direct-sequence spread spectrum: Difference between revisions

Revision as of 20:51, 24 December 2005

Revision as of 20:52, 24 December 2005

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is the reason that it is called spread spectrum. DSSS has the following features:

# A [[system]] (a) for generating spread-spectrum transmissions by [[phase]]-modulating a [[sine wave]] [[pseudorandom]]ly with a continuous [[string]] of [[pseudonoise]] [[code]] symbols, each of duration much smaller than a [[bit]] and (b) that may be time-gated, where the transmitter is keyed periodically or randomly within a specified [[time]] interval.

# 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.