Alias
Chirp Spread Spectrum
The Chirp Spread Spectrum (CSS) modulation scheme is a digital communication method that utilises wideband linear frequency modulated chirp pulses to encode information. A chirp is a signal in which the frequency increases ('up-chirp') or decreases ('down-chirp') over time. In CSS, the data bits are mapped to a series of up-chirps and down-chirps. This scheme is particularly robust against multipath fading and interference, making it suitable for use in harsh environments. It is also energy-efficient, which is beneficial for battery-powered devices. CSS is commonly used in low-power wide-area network (LPWAN) technologies, such as LoRa.
