# Okumura-Hata Propagation Model

The Okumura-Hata propagation model is a simple empirical model with short computation time.

With this model, only the transmitter and receiver height are processed. The terrain profile between transmitter and receiver is not considered. If, for example, a hill is located between transmitter and receiver, its shadowing effect is not taken into account.

Click Computation tab.

and click the## Parameters

- frequency f (150...1500 MHz)
- distance between transmitter and receiver d (1...20 km)
- antenna height of the transmitter ${h}_{tx}$ (30...200 m)
- antenna height of the receiver ${h}_{rx}$ (1...10 m)

As the height of the transmitter and the receiver is measured relative to the ground,
an effective
${T}_{x}$
antenna height (
${h}_{eff}$
) is determined to account for the topographical
impact. The transmitter antenna height above ground *H _{b}*, used in
both the formulas of the Okumura-Hata propagation model and in the formulas of the
Extended Hata model, is equal to
${h}_{tx}$
if
${h}_{eff}$
≤
${h}_{tx}$
, and is equal to
${h}_{eff}$
if
${h}_{eff}$
>
${h}_{tx}$
. This improves the accuracy of the prediction.

## Settings

- Homogenous environment: For the full prediction area, a homogeneous environment is considered without the settings in the morpho / clutter database.
- Individual environment: As defined in morpho / clutter database.

## Computation

The following equations show the computation of the basic path loss (in dB) with the model of Hata-Okumura.

*L*= path loss (dB)*f*= frequency (MHz)*H*= transmitter antenna height above ground (m)_{b}*H*= receiver antenna height above ground (m)_{m}*d*= distance between transmitter and receiver (km)*a(H*= antenna height correction factor_{m})

For medium urban area (medium, small city):

For dense urban area (large city):

*f*: 150 MHz to 1500 MHz*H*: 30 m to 200 m_{b}*H*: 1 m to 10 m_{m}*d*: 1 km to 20 km

^{1}Report ITU-R SM.2028-2 “Monte Carlo simulation methodology for the use in sharing and compatibility studies between different radio services or systems”, section 6.1, published June 2017.