Yes...
Find attached are the 3 excellent documents which completely decribes from Scratch EVM, for PA for OFDM, WLAN etc...
Very useful document on "Interpret And Apply EVM To RF SystemDesign"
"Don't Let Linearity Squeeze Your WLAN performance" and
"Effect of Power Amplifier Impairments in Designing OFDM Based Wireless Communication Systems"
are attached...