View source for Hata Model for Urban Areas

The '''Hata Model for Open Areas''', also known 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 suit the need. This model also has two more varieties for transmission in [[Hata Model for Urban Areas|Urban Areas]] and [[Hata Model for Suburban Areas|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 (telecommunications)|point-to-point]] and [[Broadcasting|broadcast]] transmissions.

==Coverage==

[[Frequency]]: 150 MHz to 1.5 GHz

==Mathematical formulation==

The Hata model for open areas is formulated as:  

<math> L_{O} \; = \; L_U \; - \; 4.78 \; (\log_{10} f)^2 \; + \; 18.33 \; \log_{10} f \; - \; 40.94 </math>

where
*''L''<sub>O</sub> = Path loss in open area. Unit: [[decibel]] (dB)
*''L''<sub>U</sub> = Path loss in [[Hata Model for Urban Areas|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==
*[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.

==Further reading==
*''Introduction to RF propagation,'' John S. Seybold, 2005, John Wiley and Sons Inc.

==See also==
* [[Hata Model for Suburban Areas]]
* [[Hata Model for Urban Areas]]
* [[Okumura Model|Okumura Model for Urban Areas]]
* [[COST Hata model]]
* [[Radio propagation model]]

[[Category:Radio frequency propagation]]