Understanding Error Vector Magnitude (EVM)

This video explains the fundamental concepts behind error vector magnitude (EVM), including what EVM is, how EVM is measured, and best practices when making EVM measurements.
More about Rohde & Schwarz Spectrum Analyzers: www.rohde-schwarz.com/us/prod...
Do you know your EVM? www.rohde-schwarz.com/us/appl...
R&S®FSW-K70 Measuring the BER and the EVM for Signals with Low SNR - Application Sheet: www.rohde-schwarz.com/us/manu...
Need help with Rohde & Schwarz products & services?
Contact Us: www.rohde-schwarz.com/us/m4c/...
Amplifier Masterclass - A discussion of EVM: • R&S Amplifier Mastercl...
Timeline:
00:00 Introduction
00:17 Suggested Viewing
00:41 About digital modulation
01:44 About error vector magnitude (EVM)
03:05 Contributors to EVM
04:25 EVM and modulation order
05:27 Calculating EVM
06:19 EVM results
07:04 EVM vs. time / symbol
07:46 EVM vs. frequency
08:44 EVM vs. power
09:25 EVM vs. power vs. frequency
09:58 Instruments for measuring EVM
10:42 Measurement best practices
11:55 Summary

[@furkanatalay2583]

Great explaining. The most understanding video than other videos which shared by Rohde Schwarz.

[@pauldenisowski]

Thank you!

[@yangwang5188]

简明扼要讲述了evm，对于小白能快速理解。

[@pauldenisowski]

谢谢你!

[@theoryandapplication7197]

thank you

[@ruben216]

useful

[@j.fkamaldeen]

Thanks 👍👍👍

[@pauldenisowski]

Thanks - appreciate the support!

[@jackychang7665]

Great videos!Thanks! And how to decide ideal vector endpoint @ 5:34?

[@pauldenisowski]

Thanks! That's a good question. The receiver must know things like the modulation type, modulation order, symbol rate, filter type, etc. From this information, it can determine what the ideal constellation is and where each ideal vector endpoint should be. This information can either be "manually" entered / configured by the user, or in some cases it can be signaled to the user via some separate channel (e.g. in cellular systems). Hope that helps!

[@farisfizri3630]

Great introduction

[@pauldenisowski]

Thanks!

[@JakeTheN3rd]

great videos! I would love the see a video about the decibel scale related to radio and power, etc. Thansk!

[@pauldenisowski]

Thanks! We actually have a whitepaper on decibels: scdn.rohde-schwarz.com/ur/pws/dl_downloads/dl_application/application_notes/1ma98/1MA98_13e_dB_or_not_dB.pdf I'll add "Understanding Decibels" to the list of future video content - thanks for the suggestion!

[@malleshgh]

What is the equation for EVM calculation as a percentage in 5g or lte

[@yaoyucao9601]

I have a question, like in a PA data sheet, they don’t mention if it refers to Max or RMS normalization, which one did they use?

[@pauldenisowski]

I would ask :)

[@chunshengzhang2417]

2