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Evaluation of SNDR using EVM (Read 4114 times)
Pashtet
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Evaluation of SNDR using EVM
Aug 24th, 2010, 8:01am
 
Hello friends.

Suppose, I want to measure SNDR of signal in digital modulation system.
As i know this thing is done through EVM measurement.
For example, if i get EVM = 0.1 does this mean that SNDR = 20* log10(1/EVM)= 20 dB - is this value right? Are there any restrictions for evaluation performance through EVM? Would be thankful for any useful links to literature.

Thanks in advance.
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RFICDUDE
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Re: Evaluation of SNDR using EVM
Reply #1 - Aug 24th, 2010, 6:54pm
 
In general you are correct to assume the relation

SNDR=20LOG(1/EVM)

Although, this relation maybe too simple depending on the complexity of the equalization system, but in my experience the relation is accurate.

It is also possible to measure SNDR using correlation techniques where you crosscorrelate the SNDR signal with the original signal. This, of course, only works for characterization since in an actual system you don't have access to the original signal.

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RFICDUDE
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Re: Evaluation of SNDR using EVM
Reply #2 - Aug 24th, 2010, 6:58pm
 
Oh, I suppose one useful reference (among many) would include.

K. M. Gharaibeh, K. G. Gard, and M. B. Steer, "Accurate Estimation of Digital Communication System Metrics SNR, EVM and Rho in a Nonlinear Amplifier Environment," 64th ARFTG Microwave Measurements Conference, December 2004, pp. 41-44.

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Pashtet
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Re: Evaluation of SNDR using EVM
Reply #3 - Aug 26th, 2010, 4:27am
 
Thanks for your reply!
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