Hata model for open areas

The Hata model for open areas, also known as the Okumura–Hata model from its origins in the Okumura model, is the most widely used model for predicting the behavior of cellular radio transmissions in open areas. It further exploits the graphical information from the Okumura model. Two additional varieties for transmission are urban areas and suburban areas.

The Hata model for open areas predicts the total path loss along a link of terrestrial microwave or other type of cellular communications. It is a function of transmission frequency and the median path loss in urban areas.

Applicable to/under conditions

This version of Hata model is applicable to the transmissions in open areas where no obstructions block the transmission link. It is suited for both point-to-point and broadcast transmissions.

Coverage

Frequency: 150 MHz to 1.5 GHz

Mathematical formulation

The Hata model for open areas is formulated as:

$L_{{O}}\;=\;L_{U}\;-\;4.78\;(\log _{{10}}f)^{2}\;+\;18.33\;\log _{{10}}f\;-\;40.94$

where

L_O = Path loss in open area. Unit: decibel (dB)
L_U = Path loss in urban areas for small sized city. Unit: decibel (dB)
f = Frequency of transmission. Unit: Megahertz (MHz).

Points to note

This model is dependent on the Hata model for urban areas.

References

Okumura, Y.; Ohmori, E.; Kawano, T.; Fukuda, K. (September–October 1968). "Field strength and its variability in VHF and UHF land-mobile radio service". Review of the Electrical Communication Laboratory (in Japanese). 16 (9-10): 825–73.
Hata, M. (August 1980). "Empirical formula for propagation oss in land mobile radio services". IEEE Transactions on Vehicular Technology. VT-29 (3): 317–25.