about SNR and transmit power
8 vues (au cours des 30 derniers jours)
Afficher commentaires plus anciens
CorneCap
le 17 Mar 2014
Réponse apportée : CorneCap
le 10 Avr 2014
Hello everyone, i m trying to calculate SNR for PLC direct link. it's given that SNR=transmit power spectral density* signal power attenuation /noise PSD.
So when applying, it's said : The total transmit power is chosen to be 12.5 dbmw with the average PSD -60 dbmw/Hz over the signal frequency band 2-20 Mhz.
i want to know which value of the power transmit should i take to calculate SNR(12.5 or -60)? i have already found the signal attenuation and noise PSD (depending on frequency). any help will be appreciated.
0 commentaires
Réponse acceptée
Honglei Chen
le 17 Mar 2014
If you want to use power spectral density, you should use the quantity corresponds to -60. Note that this is measured in dB. Since your formula involves division, you need to translate it to linear scale, which is 1e-6.
FYI, -60 and 12.5 is related. For -60dBmw/Hz over a 18 MHz band (20MHz - 2MHz), the power is actually 1e-6*18e6 = 18 mw. If you translate 18 mw to dB, you get 12.5 dBmw.
HTH
0 commentaires
Plus de réponses (1)
Voir également
Catégories
En savoir plus sur Parametric Spectral Estimation dans Help Center et File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!