Achieve Better Measurement Results with Cross-Correlated EVM
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Error Vector Magnitude (EVM) is a quality metric generally used in digital communication systems to quantify the performance of a digital radio transmitter or receiver. Cross-Correlated EVM (ccEVM) is a technique used to extend the dynamic range of a receiver for best EVM performance. Two of the same receivers are used to capture and demodulate the same signal independently and perform cross-correlation on the error vectors to cancel out uncorrelated noise added by the receivers, resulting in a much lower EVM. This technique causes the ccEVM value to primarily contain just the noise coming from the device under test (DUT); or in the case of an amplifier, noise coming from the signal source plus the DUT. This video introduces the basic concept of ccEVM and demonstrates how to achieve better WLAN 802.11be 320 MHz signal EVM results using two Keysight PXI M9415A transceivers.