April2013IEC/TR61282-10(Firstedition–2013)Fibreopticcommunicationsystemdesignguides–Part10:Characterizationofthequalityofopticalvector-modulatedsignalswiththeerrorvectormagnitudeCORRIGENDUM14.2NormalizationofthemeasureddataReplacetheexistingtextofthesecondparagraphbythefollowingnewtext:ThenormalizationfactorαischosentomatchthemeasuredvectorstothereferencebyfirstfindingthevalueofascalingfactorβforthereferencevectorsthatminimizesthecorrespondingunnormalizedEVMrmswithoutchangingthedistributionofthemeasuredvectors.Thentheinverseofβisusedasαtoscalethemeasuredvectorstothenormalizedreference.Forthispurpose,theunnormalizedEVMrmsisexpressedas()()()()=−×=∑=nQnInnNUNnr(n)measmeasmeas12measrefwhere1SSSβ(6)ThevalueofβthatgivesminimumUisdeterminedbysolving0=∂∂βU(7)leadingto()()()∑∑==×+×+==NnnrrefnrNnnrnrnQQnIIQI1meas)(meas)(ref12)(ref2)(ref1βα(8)
