Path loss due to distance

[manos87]

Hello to all of you.
Im working on a project about cooperative spectrum sensing(cognitive radio)
and i have a problem.
I want to calculate the SNR (received power/power of noise) at each Cognitive Radio,but i dont know jow to calculate the received signal power(it must be dependent to the distance bettween the cognitive radio and the primary transmitter).
Thanks in advance,
M.Iatrou

 

[manos87]

please some help on this.
Assuming the distance between transmitter and recfceiver is d
and the transmitted signal is y
then the received power in the receiver using matlab is rec_pow=mean(y.^2)./(d.^4).
Is this correct?
We assume that the channel model is AWGN.Thank you very much.

 

[Bhanumurthy]

Hi,
U can use Friis transmission equation to find the received power.This eqn gives received power in terms of transmitter power, gains of transmitting and receiving antennas , frequency of operation and path loss (which ofcourse includes distance)

Regards

 

[manos87]

Thank you very much!