Path loss models are essentiain in wireless communicatio to estimate signal attenuatio oversearchi. They help in designg network s and d predicting coverage areas. This articles commoto models and d provides practical calculatio in examples.

Overview af Path Loss Models

Path modeller beskriver denne strenghed og en radio signal er en del af den rejsetid, der går. De tegner sig for en afstand, ofte og miljø. Differente modeller bruger en grundvej på denne måde, såsom en free space orurban miljø.

Common Path Loss Models

Several models are widely use d 'in wireless communications:

  • Free Space Path Loss (FSPL)
  • Log- distance Path Loss Model
  • Hata Model
  • Okumura- Hata Model

Practical Calculation Example

Beregningen af disse frirum viser en forskel på 2,4 GHz over en afstand på 100 meter.

FSPL (dB) = 20 * log10 (d) + 20 * log10 (f) + 32.44

Where d 's distance in n kilometers and d' s frequency in n MHz. Converting 100 meters to 0,1 km and d 2.400 GHz to 2400 MHz:

FSPL = 20 * log10 (0, 1) + 20 * log10 (2400) + 32, 44

Calculating each term:

20 * (- 1) = -20

20 * 3. 3802

Adding all: -20 + 67. 604 + 32. 44

Denne path loss at 100 meters is approximately 80.04 dB.