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phase error variance to rms phase error

Started by sunshineshuvo November 2, 2010
hello,
i have an expression that gives the phase error variance of QPSK system as
follows:\
phase error variance=(Aif/sqrt(2*pi*n))*I0(-Aif/2*n)
here, Aif=IF amplitude,
n=noise component variance,
I0=modified bessel function of the 1st kind
 How can i calculate rms phase error of that system from this phase error
variance

thanks
On 11/02/2010 01:54 PM, sunshineshuvo wrote:
> hello, > i have an expression that gives the phase error variance of QPSK system as > follows:\ > phase error variance=(Aif/sqrt(2*pi*n))*I0(-Aif/2*n) > here, Aif=IF amplitude, > n=noise component variance, > I0=modified bessel function of the 1st kind > How can i calculate rms phase error of that system from this phase error > variance
What does the word "variance" mean in statistics? What does the abbreviation "RMS" stand for in signal processing? Why have you just asked a really obvious question? -- Tim Wescott Wescott Design Services http://www.wescottdesign.com Do you need to implement control loops in software? "Applied Control Theory for Embedded Systems" was written for you. See details at http://www.wescottdesign.com/actfes/actfes.html
>On 11/02/2010 01:54 PM, sunshineshuvo wrote: >> hello, >> i have an expression that gives the phase error variance of QPSK system
as
>> follows:\ >> phase error variance=(Aif/sqrt(2*pi*n))*I0(-Aif/2*n) >> here, Aif=IF amplitude, >> n=noise component variance, >> I0=modified bessel function of the 1st kind >> How can i calculate rms phase error of that system from this phase
error
>> variance > >What does the word "variance" mean in statistics? > >What does the abbreviation "RMS" stand for in signal processing? > >Why have you just asked a really obvious question? > >-- > >Tim Wescott >Wescott Design Services >http://www.wescottdesign.com
Maybe its a phase he's going through. Steve