6.1 FriisPropagationLossModel
6.1.1 Model reference
From source: Wireless Communications-Principles and Practice ,Theodore S Rappaport pg. 71
Given equation:
| | Pr = Pt*Gt*Gr*lmb^2/((4*pi)^2*d^2*L)
Pt = 10^(17.0206/10)/10^3 = .05035702
Pr = .05035702*.125^2/((4*pi)^2*d*1) = 4.98265e-6/d^2
bandwidth = 2.2*10^7
m_noiseFigure = 5.01187
noiseFloor = ((Thermal noise (K)* BOLTZMANN * bandwidth)* m_noiseFigure)
noiseFloor = ((290*1.3803*10^-23*2.2*10^7)*5.01187) = 4.41361e-13W
no interference, so SNR = Pr/4.41361e-13W
Distance :: Pr :: SNR
100 4.98265e-10W 1128.93
500 1.99306e-11W 45.1571
1000 4.98265e-12W 11.2893
2000 1.24566e-12W 2.82232
3000 5.53628e-13W 1.25436
4000 3.11416e-13W 0.70558
5000 1.99306e-13W 0.451571
6000 1.38407e-13W 0.313591
|
6.1.2 Validation test
Test program available in ns-3 at src/devices/wifi/propagation-loss-model-test-suite.cc
Taken with values (lambda = 0.125m for 802.11b at 2.4GHz, SystemLoss = 1):
| | Distance :: Pr
100 4.98265e-10W
500 1.99306e-11W
1000 4.98265e-12W
2000 1.24566e-12W
|
6.1.3 Discussion
As can be seen, the received power outputted from the model, and the power
computed from the source’s equation are identical. The test suite tests
the expected value to the most significant digit of the input expected value.
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