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What are lora spread spectrum and lora modulation?
LoRa spread spectrum and modulation (Modulation) are two key concepts in LoRa communication technology, and they play different roles in the communication link.
LoRa spread spectrum:
Definition: Spread spectrum is a technology that broadens the frequency of a signal during transmission. In LoRa, information is transmitted over a larger frequency bandwidth by using long, random spreading sequences in transmission. This makes the energy distribution of the signal on the spectrum wider, reduces the signal power at a single frequency point, and improves the ability to resist interference and multipath propagation.
Advantages: Anti-interference, anti-multipath propagation, improved receiving sensitivity.
Application: LoRa's spread spectrum technology makes it very suitable for long-distance, low-power communication, especially in complex environments such as cities and rural areas.
LoRa modulation:
Definition: Modulation is the process of adding information to a signal. In LoRa, CSS (Chirp Spread Spectrum) modulation technology is used to represent data by using linear frequency modulation (chirp) with frequency from low to high or from high to low. This modulation method has advantages for long-distance communications because its width in the frequency spectrum is relatively small.
Advantages: Improved communication distance and better penetration capability.
Application: LoRa modulation technology makes it widely used in applications requiring long distance and low power consumption such as the Internet of Things.
the difference:
The relationship between LoRa spread spectrum and modulation: Spread spectrum and modulation are the two main aspects of LoRa technology, and they are usually combined. LoRa technology uses spread spectrum modulation to represent data through frequency modulation technology. At the same time, spread spectrum technology is used to make the signal have better performance, especially in complex environments.
Function: Spread spectrum is mainly used to improve the ability to resist interference and multipath propagation, so that signals can be better transmitted in complex wireless communication environments. Modulation is mainly used to improve communication distance and penetration capabilities, making LoRa technology suitable for long-distance, low-power IoT applications.
In general, LoRa technology achieves the advantages of reliable communication over long distances, low power consumption, and complex environments by combining spread spectrum and modulation.
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