Optimization of Wireless Communication Coverage in Underground Tunnels Based on Zone Division

<table class="table-group" id="tab4"><tr><td><table class="table"><tr><td class="thead-hr" colspan="3"><hr/></td></tr><tr><td class="align_left">Parameters</td><td class="align_center">AS32-TTL node</td><td class="align_center">E22-900T node</td></tr><tr><td class="align_left" colspan="6"><hr/></td></tr><tr><td class="align_left">Center frequency</td><td class="align_center">433 MHz</td><td class="align_center">900 MHz</td></tr><tr><td class="align_left">Sending power</td><td class="align_center">21 dBm</td><td class="align_center">21 dBm</td></tr><tr><td class="align_left">Receiving sensitivity</td><td class="align_center">−130 dBm</td><td class="align_center">−148 dBm</td></tr><tr><td class="align_left">Antenna polarization</td><td class="align_center">Linear</td><td class="align_center">Linear</td></tr><tr><td class="align_left">Antenna gain</td><td class="align_center">4 dBi</td><td class="align_center">4 dBi</td></tr><tr class="table-tr"><td colspan="3"><hr class="tbody-hr"/></td></tr></table></td></tr></table>

<div>Experimental settings: details of LoRa nodes.</div>

International Journal of Antennas and Propagation

tab4

Table 4

Table 4: Optimization of Wireless Communication Coverage in Underground Tunnels Based on Zone Division 