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

# phase error variance to rms phase error

Started by ●November 2, 2010

Reply by ●November 2, 20102010-11-02

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 > varianceWhat 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

Reply by ●November 3, 20102010-11-03

>On 11/02/2010 01:54 PM, sunshineshuvo wrote: >> hello, >> i have an expression that gives the phase error variance of QPSK systemas>> 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 phaseerror>> 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.comMaybe its a phase he's going through. Steve