Simulating the Lee propagation model

The Lee model is a simple power law model that uses only the average elevation of the terrain along each radial to adjust the path loss along the radial. It assumes flat ground and does not include any terrain or building obstructions.

The model can be expressed as:
Loss(dB) = (n * 10log(R)) – 20log(Hb) – 10log(Hm) – Po + 29 + 30
where:

  • R = distance to mobile (km)
  • Hb=effective base height (m)
  • Hm = mobile height (m)

n and Po parameters taken from the following table (NOTE-these were developed for 900MHz):

  • Environment n Po
  • Free Space 2.0 -45.0
  • Open Area 4.35 -49.0
  • Suburban 3.84 -61.7
  • Philadelphia 3.68 -70.0
  • Newark 4.31 -64.0
  • Tokyo 3.05 -84.0
  • NY City 4.8 -77.0

This model can be approximated by using the EDX Custom model using the following parameters and settings:

  • C1 = 10Log(MHz/900) – Po
  • C2 = 0
  • C3 = 20
  • C4 = 10 * n
  • C5 = 0
  • C6 = 10log(Hm) + 29 + 30
  • C7,C8,C9,C10 = 0
  • Set the “Okamura-Hata” Environment setting to “Urban”
  • Set the Dieletric Constant to 0.1
  • Do not use clutter adjustments or building data

Lee Model Reference: Simon Saunders, “Antennas and Propagation for Wireless Communication Systems”, John Wiley & Sons,1999