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Reference.org
Polyphase sequence
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<p>In mathematics, a polyphase sequence is a sequence whose terms are <a href="/facts/Complex_number/2w7mqI7e">complex</a> <a href="/facts/Root_of_unity/EqH0ho1Y">roots of unity</a>: </p> a n = e i 2 π q x n {\displaystyle a_{n}=e^{i{\frac {2\pi }{q}}x_{n}}\,} <p>where <i>x</i><i>n</i> is an <a href="/facts/Integer/PUwwrawx">integer</a>. </p><p>Polyphase sequences are an important class of sequences and play important roles in synchronizing sequence design. </p>