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2. Chirp spread spectrum - Wikipedia

   en.wikipedia.org/wiki/Chirp_spread_spectrum

   In digital communications, chirp spread spectrum (CSS) is a spread spectrum technique that uses wideband linear frequency modulated chirp pulses to encode information. [1] A chirp is a sinusoidal signal whose frequency increases or decreases over time (often with a polynomial expression for the relationship between time and frequency).

3. Chirp - Wikipedia

   en.wikipedia.org/wiki/Chirp

   A chirp is a signal in which the frequency increases (up-chirp) or decreases (down-chirp) with time. In some sources, the term chirp is used interchangeably with sweep signal. [1] It is commonly applied to sonar, radar, and laser systems, and to other applications, such as in spread-spectrum communications (see chirp spread spectrum). This ...

4. Spread spectrum - Wikipedia

   en.wikipedia.org/wiki/Spread_spectrum

   Moreover, for a given noise power spectral density (PSD), spread-spectrum systems require the same amount of energy per bit before spreading as narrowband systems and therefore the same amount of power if the bitrate before spreading is the same, but since the signal power is spread over a large bandwidth, the signal PSD is much lower — often ...

5. Chirp spectrum - Wikipedia

   en.wikipedia.org/wiki/Chirp_spectrum

   The spectrum is of particular interest when pulses are subject to signal processing. For example, when a chirp pulse is compressed by its matched filter, the resulting waveform contains not only a main narrow pulse but, also, a variety of unwanted artifacts many of which are directly attributable to features in the chirp's spectral characteristics.

6. Low-power wide-area network - Wikipedia

   en.wikipedia.org/wiki/Low-power_wide-area_network

   Chirp spread spectrum (CSS) based devices. Sigfox, UNB-based technology and French company. [4] LoRa is a proprietary, chirp spread spectrum radio modulation technology for LPWAN used by LoRaWAN, Haystack Technologies, and Symphony Link. [5] [6] MIoTy, implementing Telegram Splitting technology.

7. Direct-sequence spread spectrum - Wikipedia

   en.wikipedia.org/.../Direct-sequence_spread_spectrum

   Direct-sequence spread-spectrum transmissions multiply the symbol sequence being transmitted with a spreading sequence that has a higher rate than the original message rate. Usually, sequences are chosen such that the resulting spectrum is spectrally white. Knowledge of the same sequence is used to reconstruct the original data at the receiving ...

8. Real-time locating system - Wikipedia

   en.wikipedia.org/wiki/Real-time_locating_system

   ISO/IEC 24730-2:2012 Information technology — Real time locating systems (RTLS) — Part 2: Direct Sequence Spread Spectrum (DSSS) 2,4 GHz air interface protocol; ISO/IEC 24730-5:2010 Information technology — Real-time locating systems (RTLS) — Part 5: Chirp spread spectrum (CSS) at 2,4 GHz air interface

9. Level of Repair Analysis - Wikipedia

   en.wikipedia.org/wiki/Level_of_Repair_Analysis

   LORA establishes when and where each unit will be repaired and determines if it is more cost effective to discard an item than attempt to repair it. While this kind of analysis seems costly and unnecessary, at enterprise scales over many years, significant cost savings can be realized.