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SNR between two wireless antenna equation

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khalid_1989ju

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Dear all,
I'm working with CRN wireless antenna
kindly I need help in the SNR equation

suppose I have two antenna :

1- transmitting power =24 DBm
2- cable losses =1 DB at each side (Transmitter and reciever )
3- TX antenna gain 24 dbi
4- RX antenna gain =24 DBi
5- Distance between antennas =20 miles
6- FSPL=130 DB at 2.4 GHz (I calculated it )
7-assume RX sensitivity =-83 dbm

so the receiving power will be 23 dbm

but I need an equation to calculate the max distance that I can get with minimum SNR =-15 DB
?
kindly I went o Friis formula , but I cannot calculate the SNR ?

can I get it from the free FSPL ?

- - - Updated - - -

Sorry
receiving power will be 23 db
 

You have SPL right, so you should be able to calculate the received power correctly. It's not 23 dBm (and neither 23dB). SNR is the ratio of received power and receiver sensitivity.
 

FvM said:
You have SPL right, so you should be able to calculate the received power correctly. It's not 23 dBm (and neither 23dB). SNR is the ratio of received power and receiver sensitivity.
Click to expand...


Dear ,
you are right
the received power =-90 DB =60 DBm and can be calculated from FRIIS Formula

now the SOM = Received power - RX sensitivity = -60 DBm - (-DBm ) =23 DB ;

now the noise can be calculated as -174+Nf+10log(bandwidth) = -95 DB with NF=11 and bandwidth =6MHz

now further more :

the SNR =received power/noise = -90DB - (-95DB) =5DB ==> is this right ? or the receiver sensitivity must be included?
 

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