The following diagram is the measurement result of “PER vs EVM.”
We found that the EVM had to be under -29 dBm if 1024QAM when the standard that meets the communication quality is under 10% PER (packet error rate).
The relationship of S/N ratio between EVM and transmission waveform at this time is indicated in the diagram below.
We have found that communication becomes difficult if the S/N ratio deteriorates by 5 dB for 1024QAM even if the design satisfies EVM -35 dBm, a value that conforms to the standard.
The necessity to implement noise suppression measures increases since the condition is harsher compared to when the required margin was 12 dB in 64QAM.
The noise to consider may include Bluetooth® module signals, high speed I/F signals, and DC-DC converter noise.