noise power spectral density
in [Matlab]
|
Prev: loop for a fmincon
Next: reset in simulink?
From: SARVANI NADIMINTY on 25 Mar 2010 07:26 How should we calculate noise power spectral density for Additive white gaussian noise when we know only the noise samples? i.e. i have generated awgn using rand(1,N); where N is some constant. How can i calculate the noise power spectral density without knowing any frequencies and input signal?
From: Wayne King on 25 Mar 2010 07:44 "SARVANI NADIMINTY" <sarvani_nadi(a)yahoo.co.in> wrote in message <hofh8d$no$1(a)fred.mathworks.com>... > How should we calculate noise power spectral density for Additive white gaussian noise when we know only the noise samples? i.e. > > i have generated awgn using rand(1,N); where N is some constant. How can i calculate the noise power spectral density without knowing any frequencies and input signal? Hi Sarvani, you can estimate the power spectral density as a function of radians/sample. Note that the frequency axis in the following is from 0 to pi radians/sample H=spectrum.periodogram; x = randn(1000,1); plot(psd(H,x)); Wayne
From: SARVANI NADIMINTY on 25 Mar 2010 08:28 "Wayne King" <wmkingty(a)gmail.com> wrote in message <hofia6$h5j$1(a)fred.mathworks.com>... > "SARVANI NADIMINTY" <sarvani_nadi(a)yahoo.co.in> wrote in message <hofh8d$no$1(a)fred.mathworks.com>... > > How should we calculate noise power spectral density for Additive white gaussian noise when we know only the noise samples? i.e. > > > > i have generated awgn using rand(1,N); where N is some constant. How can i calculate the noise power spectral density without knowing any frequencies and input signal? > > Hi Sarvani, you can estimate the power spectral density as a function of radians/sample. > Note that the frequency axis in the following is from 0 to pi radians/sample > > H=spectrum.periodogram; > x = randn(1000,1); > plot(psd(H,x)); > > Wayne Thank you. Can u pls tell me what is this 'spectrum.periodogram'?
From: Wayne King on 25 Mar 2010 08:57 "SARVANI NADIMINTY" <sarvani_nadi(a)yahoo.co.in> wrote in message <hofksn$s33$1(a)fred.mathworks.com>... > "Wayne King" <wmkingty(a)gmail.com> wrote in message <hofia6$h5j$1(a)fred.mathworks.com>... > > "SARVANI NADIMINTY" <sarvani_nadi(a)yahoo.co.in> wrote in message <hofh8d$no$1(a)fred.mathworks.com>... > > > How should we calculate noise power spectral density for Additive white gaussian noise when we know only the noise samples? i.e. > > > > > > i have generated awgn using rand(1,N); where N is some constant. How can i calculate the noise power spectral density without knowing any frequencies and input signal? > > > > Hi Sarvani, you can estimate the power spectral density as a function of radians/sample. > > Note that the frequency axis in the following is from 0 to pi radians/sample > > > > H=spectrum.periodogram; > > x = randn(1000,1); > > plot(psd(H,x)); > > > > Wayne > Thank you. Can u pls tell me what is this 'spectrum.periodogram'? It is a periodogram spectral analysis object. wayne
From: SARVANI NADIMINTY on 31 Mar 2010 16:40
"Wayne King" <wmkingty(a)gmail.com> wrote in message <hofmj1$q7b$1(a)fred.mathworks.com>... > "SARVANI NADIMINTY" <sarvani_nadi(a)yahoo.co.in> wrote in message <hofksn$s33$1(a)fred.mathworks.com>... > > "Wayne King" <wmkingty(a)gmail.com> wrote in message <hofia6$h5j$1(a)fred.mathworks.com>... > > > "SARVANI NADIMINTY" <sarvani_nadi(a)yahoo.co.in> wrote in message <hofh8d$no$1(a)fred.mathworks.com>... > > > > How should we calculate noise power spectral density for Additive white gaussian noise when we know only the noise samples? i.e. > > > > > > > > i have generated awgn using rand(1,N); where N is some constant. How can i calculate the noise power spectral density without knowing any frequencies and input signal? > > > > > > Hi Sarvani, you can estimate the power spectral density as a function of radians/sample. > > > Note that the frequency axis in the following is from 0 to pi radians/sample > > > > > > H=spectrum.periodogram; > > > x = randn(1000,1); > > > plot(psd(H,x)); > > > > > > Wayne > > Thank you. Can u pls tell me what is this 'spectrum.periodogram'? > > It is a periodogram spectral analysis object. > > wayne Thanks a lot for the reply but i want a specific value for power spectral density to use it in a program. Can you help me to get values |