Electromagnetic wave loss formula in own space:
L=32.4+20lgd+20lgf
D: Distance F: Frequency
It can be seen from the formula that the farther away the frequency is, the higher the loss, the greater the propagation distance, and the lower the signal strength by 6db.
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The following is a typical wireless Link parameter value for a model base station: please answer as required
Downstream: Base station transmit power 43dBm (30W), h2d-duplexer loss 4.5 DB, feeder loss 3dB, base station antenna gain 15dBi, cell phone sensitivity -102dbm, human consumption 3dB, mobile antenna gain -2db
Uplink: Mobile phone transmitter power 33dBm (2W), mobile phone antenna gain -2db, human loss 3dB, base station antenna gain 15dBi, diversity receive gain 5 DB, base station feeder loss 3dB, base station sensitivity -110dbm.
Try to answer:
The maximum allowable wireless transmission loss on the upper and lower lines is how much.
Whether the wireless link is upstream restricted or downstream. What is the actual maximum allowable wireless transmission loss. All
dl:102-(43dbm-4.5-3db+15-3db-2db) =61.5ul:110-(30-2-3+15+5-3) =68
68>61.5 Downlink Limited
Actual allowable maximum 61.5