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What’s LoRa?
Source:Original | Author:C&T RF Antennas Inc | Publish time: 2018-11-08 | 2301 Views | Share:

Class B: Bidirectional communication terminal device with preset receiving slot. This type of terminal device will be at the preset time to open the redundant receiving window, in order to achieve this purpose, the terminal will synchronize from the gateway to receive a Beacon, through the Beacon base station and module time synchronization. This way enables the server to know that the terminal device is receiving data.

Class C: Bidirectional communication terminal equipment with the largest receiving slot. This type of terminal device continues to open the receiving window, only when the transmission is closed.

LoRa technical points

In general, the transmission rate, operating frequency band, and network topology are the three main parameters that affect the characteristics of the sensor network. The choice of transmission rate will affect the transmission distance and battery life of the system; the choice of working frequency band to compromise the frequency band and the system design goals; and in the FSK system, the network topology is selected by the transmission distance requirements and the system needs nodes Number to decide. LoRa incorporates digital spread spectrum, digital signal processing, and forward error correction coding technology, with unprecedented performance. Previously, only those high-grade industrial radio communications would fuse these technologies, and with the introduction of LoRa, the field of embedded wireless communications has undergone a radical change.

The forward error correction coding technique adds some redundant information to the sequence of data to be transmitted so that the error symbols injected in the data transmission process are corrected at the receiving end in time. This technology reduces the need to create "self-repair" packets in the past and performs well in resolving burst errors caused by multipath fading. Once the packet packets are set up and injected with forwarding error correction coding to ensure reliability, these packets will be sent to the digital spread spectrum modulator. This modulator feeds each bit of the packet into an "expander", dividing each bit of time into a number of chips.