SLIC EVM - Error Vector Magnitude without Demodulation

TitleSLIC EVM - Error Vector Magnitude without Demodulation
Publication TypeConference Paper
Year of Publication2017
AuthorsFreiberger, K., Enzinger H., & Vogel C.
Conference Name89th ARFTG Microwave Measurements Symposium
Date PublishedJune
Conference LocationHonolulu, Hawaii
KeywordsError power ratio (EPR), error vector magnitude (EVM), noise power ratio (NPR), nonlinear measurement
Abstract

We present a method for measuring a communication signal's inband error caused by a non-ideal device under test (DUT). In contrast to the established error vector magnitude (EVM), we do not demodulate the data symbols. Rather, we subtract linearly correlated (SLIC) parts from the DUT output and analyze the power spectral density of the remaining error signal. Consequently, we do not require in-depth knowledge of the modulation standard. This makes our method well suited for measurements with cutting-edge communication signals, without the need to purchase or implement a dedicated EVM analyzer. We show that our SLIC-EVM approach allows for estimating the subcarrier-dependent EVM for typical transceiver impairments like IQ mismatch, phase noise, and power amplifier (PA) nonlinearity. We present measurement results of a WLAN PA, showing less than 0.2 dB absolute deviation from the regular EVM with demodulation.

 

 

Citation KeyFreiberger17c