RFM92 Datasheet, PDF (40/126 Pages) List of Unclassifed Manufacturers – Low Power Long Range Transceiver Module

RFM92W/93W V3.0
Channel activity detection
The use of a spread spectrum modulation technique presents challenges in determining whether the channel is already in
use by a signal that may be below the noise floor of the receiver. The use of the RSSI in this situation would clearly be
impracticable. To this end the channel activity detector is used to detect the presence of other LoRa^TM signals. Figure 11
shows the channel activity detection (CAD) process:
Figure 11. LoRa^TM CAD flow
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