What is spreading factor?
The spreading factor controls the chirp rate, and thus controls the speed of data transmission. Lower spreading factors mean faster chirps and therefore a higher data transmission rate. For every increase in spreading factor, the chirp sweep rate is halved, and so the data transmission rate is halved.
How do you calculate spreading factor?
Spreading Factor (SF) decides on how many chirps, the carrier of the data, are sent per second. The network decides the spreading factor (graded between 7-12) based on the environmental conditions between the communication device and the gateway.
Is LoRa a spread spectrum?
LoRa (short for long range) is a spread spectrum modulation technique derived from chirp spread spectrum (CSS) technology. Semtech’s LoRa is a long range, low power wireless platform that has become the de facto wireless platform of Internet of Things (IoT).
What is the bandwidth of LoRa?
2. LoRa Technology
| Parameters | Values |
|---|---|
| Spreading Factor (SF) | 6 to 12 |
| Channel Bandwidth (BW) | 125 kHz, 250 kHz, 500 kHz |
| Power | -1 to 14 dBm |
What is the spreading factor called?
In a CDMA (Code Division Multiple Access) system, the number of chips per data symbol is called the SF (Spreading Factor). The lower the spreading factor the higher the data rate.
What is the spreading factor and bandwidth in Lora?
As discussed before, LoRa is a chirp spread spectrum modulation. The transmitted data, which is a symbol, will be represented by a chirp signal with a frequency range from to , which is shown in Figure 1. In LoRa modulation, we can configure the symbol by changing the Spreading Factor and Bandwidth parameters.
Which is spread spectrum scheme does Lora use?
LoRa is a proprietary spread spectrum modulation scheme that is based on Chirp Spread Spectrum modulation (CSS). Chirp Spread Spectrum is a spread spectrum technique that uses wideband linear frequency modulated chirp pulses to encode information.
Which is the best spreading factor for LoRaWAN?
The spreading factor for various regions across the world are mentioned in the following tables. As mentioned small spreading factors offer high bit rate or LoRaWAN data rate and need less OTA (Over The Air) time. Large spreading factors offer low data rates and need more over the air time.
What’s the difference between LoRa modulation and CSS?
LoRa Modulation in LoRaWAN uses chirp spread spectrum for encoding. Here, each bit is spread by chipping factor. The number of chips per bit is known as spreading factor. In other words, the duration of chirp is known as spreading factor. CSS uses spreading factors from 7 to 12.