CDA EVM9 Manuale Utente Scaricare il pdf (Pagina 25)

• GMSK PFER - Constant amplitude,

simple phase rotation, phase and

frequency measurement

• EDGE 8PSK Modulation Accuracy

• Amplitude component added to

phase component to give Error

Vector Magnitude

•95

th

percentile EVM

measurement

• IQ Imbalance, amplitude droop

through burst

Measurements – PFER vs Mod Acc

EDGE - Error Vector Magnitude

I-Q Magnitude Error

{

I

Q

Error Vector Time

Reference Vector

I-Q Phase Error

Measured

Vector

T

Reference

Decision Point

I(t)

I

•RMS EVMd 9%

• Origin offset suppression d 30 dB

• Peak EVM d 30%

• 95:th-percentile EVM d 15%

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