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# Hata Model for Open Areas

The Hata Model for Open Areas, also knows as the Okumura-Hata model for being a developed version of the Okumura Model, is the most widely used model in radio frequency propagation for predicting the behavior of cellular transmissions in open areas. This model incorporates the graphical information from Okumura model and develops it further to better suite the need. This model also has two more varieties for transmission in Urban Areas and Suburban Areas.

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

## Applicable to/under conditions

This particular version of Hata model is applicable to the transmissions in open areas where no obstructions block the transmission link

This model is suited for both point-to-point and broadcast transmissions.

## Coverage

Frequency: 150 MHz to 1.5 GHz

## Mathematical formulation

Hata model for open areas is formulated as,

$L_\left\{O\right\} ; = ; L_U ; - ; 4.78 ; \left(log f\right)^2 ; + ; 18.33 ; log f ; - ; 40.94$

Where,

• LO = Path loss in open area. Unit: decibel (dB)
• LU = Path loss in urban area. 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

• [1] Okumura, Y. a kol.: Field Strength and its Variability in VHF and UHF Land-Mobile

Radio Service. Rev. Elec. Comm. Lab. No.9-10pp. 825 - 873, 1968.

• [2] Hata, M.: Empirical Formula for Propagation Loss in Land Mobile Radio Services.

IEEE Trans. Vehicular Technology, VT-29, pp. 317 - 325, 1980.