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Chirp spread spectrum
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<p>In digital communications, chirp spread spectrum (CSS) is a <a href="/facts/Spread_spectrum/0NKdJX1S">spread spectrum</a> technique that uses wideband linear frequency modulated <a href="/facts/Chirp/hCQrvcz8">chirp</a> pulses to encode information. A <a href="/facts/Chirp/hCQrvcz8">chirp</a> is a <a href="/facts/Sinusoidal/mD1CB09M">sinusoidal</a> signal whose frequency increases or decreases over time (often with a <a href="/facts/Polynomial/Lzak8VVx">polynomial</a> expression for the relationship between time and frequency). </p>