Warning: Can't synchronize with repository "(default)" (/media/seamcatrepo does not appear to be a Subversion repository.). Look in the Trac log for more information.

You are here: Manual / Propagation Models / Extended Hata


Extended Hata and Hata-SRD models

The Hata model (also referred to as Okumura-Hata) was originally developed for non-Line-Of-Sight (Non-LOS) paths in urban environments typical of mobile services - that is with low-height mobile terminals moving in cluttered environment.

The Hata-SRD variation was developed in CEPT within the Project Team SE24 for studies of Short Range Devices (SRD). The basis for modification was an assumption that although SRD devices are usually operated at low antenna heights (typically person-carried devices, i.e. with antenna height of ca. 1.5 m), but the interference would usually occur at relatively short distances (up to 100 m or so) when direct-Line-Of-Sight(LOS) or near-direct-LOS might be assumed.

Therefore the Hata-SRD model includes adjusted expression of a certain parameter b(Hb), which in standard Hata model would introduce significant extra path loss when transmitter antenna height is much less than 30 m. It was found that this extra loss is not justified in the considered SRD scenarios of short range & direct-LOS communication/coupling.

See the separate page for recommendations regarding selection of most appropriate model for your studies.

For detailed description of Extended-Hata and Hata-SRD models implemented in SEAMCAT see the attached PDF file (156 KB).