RF propagation

[chaperera]

I wonted to calculate the Power Budjet for an In-Building DAS of one of Building so please let me Know 1 Equation for Dffraction Loss.(Interfer Diffaction Loss @ 40m)

[Will.Spencer]

Originally Posted by chaperera

I wonted to calculate the Power Budget for an In-Building DAS of one of Building so please let me Know 1 Equation for Dffraction Loss.(Interfer Diffaction Loss @ 40m)

For those readers not familiar with the terminology, "DAS" stands for "Distributed Antenna System."

There are many models (formulas) used to calculate loss, but all of them are merely approximations of reality.

The most applicable model for this application is the ITU Model for Indoor Attenuation:



where:

• L = the total path loss. Unit: Decibel (dB).
• f = Frequency of transmission. Unit: Mega Hertz(MHz).
• d = Distance. Unit: Meter (m).
• N = The Distance Power Loss coefficient.
• n = Number of floors between the transmitter and receiver.
• Pf(n) = the Floor Loss penetration factor.

[chaperera]

The Equation you have send me the total Loss. But i need the equation of Iterferer Diffraction Loss? (At Some Hight)

[Will.Spencer]

How is a diffraction loss formula going to help you?

Look here: JPL's Wireless Communication Reference Website: Diffraction Loss.

[chaperera]

How i can calculate the Power of MS and BTS in WCDMA for INdoor ditributioan Antenna systems

[Will.Spencer]

For other readers of this thread:

MS stands for Mobile Station. It's the technical term for "cell phone." :lol:

BTS stands for Base Transceiver Station. The BTS is the component of a mobile telephone network which provides the radio interface to the mobile stations.

chaperera, calculating the power requirements for the mobile stations won't do you any good -- because you can't control their power output. You get what the government regulators let the handset manufacturers provide.

For the BTS, power requirements are completely dependent upon the design of your DAS (Distributed Antenna System). Unless you have the right software, you are much better off relying on your BTS vendors to help you select the BTS model with the right power level to meet your needs.