Direct-sequence spread spectrum: Difference between revisions

Revision as of 15:51, 25 February 2002

Revision as of 11:35, 31 March 2002

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In [[telecommunication]], the term '''direct-sequence spread spectrum''' has the following meanings:

<b>1.</b> A [[system]] (a) for generating spread-spectrum transmissions by [[phase]]-modulating a sine wave pseudorandomly 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.

<b>2.</b> A [[signal]] structuring technique utilizing a [[digital]] code [[sequence]] 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. </b>