Setting Views
WCA230A & WCA280A User Manual
3- 205
See Figure 3--142 for EVM, Mag Error, and Phase Error. The figure is an
example of the constellation view in 1/4
π
QPSK modulation. The cross marks are
referred to as symbols and indicate phase positions of the ideal signal (amplitude
is fixed in this case). In this modulation, the bit pattern is determined by
movements from each position. For example, if the actual signal has shifted from
the ideal symbol position to the
F
position, you can evaluate vector signal
quality as magnitudes of error in radius direction (amplitude), error in phase
direction, and total error vector. These three types of errors correspond to the
three types of views in the EVM view:
H
EVM (%RMS): Root-mean-square value of EVM (Error Vector Magnitude)
H
Mag Error (%RMS): Root-mean-square value of magnitude error
H
Phase Error (%RMS): Root-mean-square value of phase error
Magnitude error
(Mag Error)
Error Vector Magnitude (EVM)
Phase error
θ
(Phase Error)
θ
Q
I
+3/4
π
movement (10)
--3/4
π
movement (11)
--1/4
π
movement (01)
+1/4
π
movement (00)
Assumed position before movement
Figure 3- 142: Constellation view and error vectors in 1/4
π
QPSK
Summary of Contents for WCA200A
Page 6: ......
Page 8: ......
Page 29: ...Getting Started...
Page 30: ......
Page 57: ...Operating Basics...
Page 58: ......
Page 86: ...Functional Overview 2 28 WCA230A WCA280A User Manual...
Page 125: ...Reference...
Page 126: ......
Page 208: ...Modulation Analysis Demod Mode 3 82 WCA230A WCA280A User Manual...
Page 272: ...Setting Timing Parameters 3 146 WCA230A WCA280A User Manual...
Page 346: ...Display Line 3 220 WCA230A WCA280A User Manual...
Page 358: ...Marker Operation and Peak Search 3 232 WCA230A WCA280A User Manual...
Page 388: ...File Format 3 262 WCA230A WCA280A User Manual...
Page 392: ...Screen Copy 3 266 WCA230A WCA280A User Manual...
Page 393: ...Appendices...
Page 394: ......
Page 430: ...Appendix C Digital Demodulation Symbol Mapping C 4 WCA230A WCA280A User Manual...
Page 437: ...Glossary...
Page 438: ......
Page 446: ...Glossary Glossary 8 WCA230A WCA280A User Manual...
Page 447: ...Index...
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