ITU Model for Indoor Attenuation

ITU model for indoor attenuationFrom Wikipedia, the free encyclopediaJump to: navigation, search

The ITU indoor propagation model, also known as ITU model for indoor attenuation, is a radio propagation model that estimates the path loss inside a room or a closed area inside a building delimited by walls of any form. Suitable for appliances designed for indoor use, this model approximates the total path loss an indoor link may experience.

Contents

[hide]

• 1 Applicable to/under conditions• 2 Coverage• 3 Mathematical formulations

◦ 3.1 The model◦ 3.2 Calculation of distance power loss coefficient◦ 3.3 Calculation of floor penetration loss factor

• 4 Points to note• 5 Further reading• 6 See also• 7 References

Applicable to/under conditions[edit]

This model is applicable to only the indoor environments. Typically, such appliances use the lower microwave bands around 2.4 GHz. However, the model applies to a much wider range.

Coverage[edit]

Frequency: 900 MHz to 5.2 GHz

Floors: 1 to 3

Mathematical formulations[edit]

The model[edit]

The ITU indoor path loss model is formally expressed as:

Page 1 of 5ITU model for indoor attenuation - Wikipedia, the free encyclopedia

12/9/2014http://en.wikipedia.org/wiki/ITU_model_for_indoor_attenuation

where,

L = the total path loss. Unit: decibel (dB).f = Frequency of transmission. Unit: megahertz(MHz).d = Distance. Unit: metre (m).N = The distance power loss coefficient.n = Number of floors between the transmitter and receiver.Pf(n) = the floor loss penetration factor.

Calculation of distance power loss coefficient[edit]

The distance power loss coefficient, N is the quantity that expresses the loss of signal power with distance. This coefficient is an empirical one. Some values are provided in Table 1.[1]

Frequency band Residential area Office area Commercial area

900 MHz N/A 33 20

1.2 GHz N/A 32 22

1.3 GHz N/A 32 22

1.8 GHz 28 30 22

4 GHz N/A 28 22

5.2 GHz N/A 31 N/A

60 GHz N/A 22 17

Calculation of floor penetration loss factor[edit]

The floor penetration loss factor is an empirical constant dependent on the number of floors the waves need to penetrate. Some values are tabulated in Table 2.[1]

Frequency band Number of floors Residential area Office area Commercial area

900 MHz 1 N/A 9 N/A

900 MHz 2 N/A 19 N/A

900 MHz 3 N/A 24 N/A

1.8 GHz n 4n 15+4(n-1) 6 + 3(n-1)

2.0 GHz n 4n 15+4(n-1) 6 + 3(n-1)

5.2 GHz 1 N/A 16 N/A

Points to note[edit]

This section is empty. You can help by adding to it. (July 2010)

Further reading[edit]

• Introduction to RF propagation, John S. Seybold, 2000, John Wiley and Sons.



• Propagation data and prediction methods for the planning of indoor radio communication systems and the radio local area networks in the frequency range 900 MHz to 100 GHz, ITU-R Recommendations, Geneva, 2001.

See also[edit]

• Log-distance path loss model• Radio propagation model• Young model

References[edit]

1. ^ a b Propagation data and prediction methods for the planning of indoor radio communication systems and the radio local area networks in the frequency range 900 MHz to 100 GHz, ITU-R Recommendations, Geneva, 2001

Retrieved from "http://en.wikipedia.org/w/index.php?title=ITU_model_for_indoor_attenuation&oldid=615683013" Categories:

• Radio frequency propagation

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ITU Model for Indoor Attenuation