hi there this is a newbie working on a signal denoising problem. i want to jam a given signal with a white noise pulsed jammer such that the effective jammer to signal ratio is some known value, say 30 db for example. to generate the wgn, i specify the variance in simulink for the gaussian noise source. what is the realtion between the variance (sigma) and power of white gaussian noise? could anyone guide to links to formulae for power for other distributions? regards, nityanand

# Power and variance of Gaussian White Noise

Started by ●February 26, 2004

Reply by ●February 26, 20042004-02-26

Arjun Admirer wrote:> hi there > > this is a newbie working on a signal denoising problem. i want to jam > a given signal with a white noise pulsed jammer such that the > effective jammer to signal ratio is some known value, say 30 db for > example. > > to generate the wgn, i specify the variance in simulink for the > gaussian noise source. > > what is the realtion between the variance (sigma) and power of white > gaussian noise?I think you mean sigma^2 here.> > could anyone guide to links to formulae for power for other > distributions? > > regards, nityanandTry this: Gaussian_sigma = 0.5 * sqrt(2) * ( 10^(0.05 * noise_level_dB ) ) Good luck, OUP

Reply by ●February 27, 20042004-02-27

In article 98a8c1a8.0402261015.41c8dc5d@posting.google.com, Arjun Admirer at nityanand_misra@hotmail.com wrote on 02/26/2004 13:15:> > what is the realtion between the variance (sigma) and power of white > gaussian noise?the variance of a random process is the AC power. the mean square is the total, AC+DC, power. but the power of *true* white noise is infinite. that's because there is infinite area under the power spectrum for white noise. bandlimited white noise has finite power that is proportional to the bandwidth.> could anyone guide to links to formulae for power for other > distributions?same as above. r b-j