Research Article
Optimization of Wireless Communication Coverage in Underground Tunnels Based on Zone Division
Table 4
Experimental settings: details of LoRa nodes.
| Parameters | AS32-TTL node | E22-900T node |
| Center frequency | 433 MHz | 900 MHz | Sending power | 21 dBm | 21 dBm | Receiving sensitivity | −130 dBm | −148 dBm | Antenna polarization | Linear | Linear | Antenna gain | 4 dBi | 4 dBi |
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