How does LoRa communication work?

LoRa works by moving an RF tone around over time in a very linear way. This graph shows the chirps in a reverse waterfall—the newest data is at the top, which is called an “up chirp.” You can see how this frequency of the tone is increasing over time.

What modulation scheme is currently used by LoRa?

Generated by Semtech LoRa IOT parts, including the SX1272 and SX1276 transceiver chips, LoRa’s modulation format is best described as a “frequency modulated (FM) chirp.” The core IP that enables LoRa is the ability to generate a stable chirp using a frac-N phase lock loop (PLL).

What is the spreading factor range for LoRa communication?

between 7 and 12
The spreading factor (SF) impacts the communication performance of LoRa, which uses an SF between 7 and 12. A larger SF increases the time on air, which increases energy consumption, reduces the data rate, and improves communication range.

What is LoRa wireless technology?

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).

Which OSI model layer is covered by the LoRa specification?

The LoRa protocol is a component in the physical layer of the OSI model and LoRaWAN is a data-link layer (medium access control) standard.

Is LoRa a sensor?

LoRa is a popular new standard for connecting wireless sensors with very long range and long battery life. The name LoRa is a shortened version of “Long Range” and uses a proprietary modulation scheme called chirp spread spectrum developed by Semtech.

Is LoRaWAN real time?

LoRa Communication as a Solution for Real-Time Monitoring of IoT Devices at UNICAMP. Datasheets indicate that LoRa can present a range of 15 km, but without specifying the environmental conditions, devices parameters, bandwidth, spreading factor, coding rate, transmission frequency and so on.

Can you transmit video over LoRa?

The speed at which you can send data over LoRaWAN is extremely low. Don’t expect to send large files such as music, video, or images over this type of network. It’s suitable for extremely small sensor data packets that can be used for alarms, triggering, and monitoring purposes.

What kind of topology does the Lora network use?

The LoRaWAN network architecture uses a star-of-star topology in which each end node communicates with multiple gateways communicating with the network server. The LoRa network has four elements (Figure 4): The End Nodes gather sensor data, transmit it upstream, and receive downstream communication from the application server.

How are end devices used in a LoRaWAN application?

Now I’ll show how these devices can be used in a real LoRaWAN application. The Things Network (TTN) is the Internet infrastructure that allows us to use end devices to do something useful on the Internet. End devices (sometimes called nodes) talk to a nearby gateway, which is connected to the Things Network infrastructure.

What kind of modulation is used in Lora?

The LoRa scheme is based on a variant of SSM called chirp spread spectrum (CSS) modulation (Figure 3). CSS encodes the data with a “chirp,” which is essentially a wideband frequency modulated sinusoidal signal that increases or decreases over time.

Which is the media access control ( MAC ) layer for Lora?

The LoRaWAN specification defines the media access control (MAC) layer for LPWAN. LoRaWAN is implemented on top of the LoRa physical layer and specifies the communication protocol and network architecture. These functions have a high degree of influence over several performance parameters, including:

How does LoRa communication work?