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LoRa® is a spread spectrum modulation technique based on the Compressed High-Intensity Radar Pulse or "chirp" spread spectrum and is a physical layer in LoRaWAN. It uses so-called "chirps"; that is, a signal with frequency moving up or down (up-chirp or down-chirp respectively) with a different speed.
Chirp spread spectrum o CSS, en comunicacions digitals, és una tècnica d'espectre eixamplat que utilitza polsos chirp de modulació de freqüència lineal de gran amplada de banda per a codificar la informació. Un pols Chirp és un senyal sinusoidal la freqüència del qual s'incrementa o es decreix amb el temps.
Abstract: Chirp Spread Spectrum (CSS) is modeled after frequency-hopping spread spectrum and adopted by the LPWAN (Low Power Wide Area Network) standard. Designated as IEEE 802.15.4a, it is suited to applications requiring low power and low data rates. The use of chirps as the basic building blocks provides opportunities to adapt the waveform to radar applications.
In this paper, the authors proposed a novel OFDM system based on cyclic shift keying (CSK) and chirp spread spectrum (CSS) modulation. On the one hand, the CSK modulation can effectively solve the high PAPR problem, on the other hand, the CSS modulation can suppress the frequency selective fading because the multi-path signals will be expanded from each other in the frequency domain after ...
Chirp Spread Spectrum (CSS) is a customized application of MDMA for the requirements of battery–powered applications, where the reliability of the transmission as well as low power consumption are of special importance. CSS forms the basis of the nanoLOC TRX Transceiver which was developed for medium data rate applications.
14 de dic. de 2021 · Chirp Spread Spectrum (CSS), also referred to as chirp, is a RF technology that offers unique advantages such as reduced power consumption, location accuracy of 1-2 meters, near real-time positioning and more.
This paper describes a coherent chirp spread spectrum (CSS) technique based on the Long-Range (LoRa) physical layer (PHY) framework. LoRa PHY employs CSS on top of a variant of frequency shift keying (FSK), and non-coherent detection is employed at the receiver for obtaining the transmitted data symbols. In this paper, we propose a scheme that encodes information bits on both in-phase and ...
