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<p>In <a href="page.php?w=spread-spectrum">spread-spectrum</a> systems, the receiver <a href="page.php?w=correlation">correlates</a> a locally generated signal with the received <a href="page.php?w=signal_%28information_theory%29">signal</a>. Such spread-spectrum systems require a set of one or more "codes" or "sequences" such that<br/>
* Like random noise, the local sequence has a very low correlation with any other sequence in the set, or with the same sequence at a significantly different time offset, or with narrow band interference, or with</p><p>
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