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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. In the SEAMCAT propagation library, you will find it under the name “Extended Hata”.

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. In the SEAMCAT propagation library, you will find it under the name  “Extend Hata - SRD”

 

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Figure 468: SEAMCAT Interface to the extended Hata propagation model (general model on the left) and its adapted version for SRDs (on the right)

 

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Table 78: Description of the Extended Hata and Extended Hata (SRD) models

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