Measurement of EVM (Error Vector Magnitude) for 3G

kobeqiao

Ericsson的材料
PREFACE...................................................................................................2
ABSTRACT.................................................................................................3
TABLE OF CONTENTS ..............................................................................4
TERMINOLOGY..........................................................................................5
1 Introduction....................................................................................6
1.1 EVM Definition...............................................................................6
1.2 Difficulties of the measurement......................................................8
1.3 QPSK Modulation ........................................................................11
2 Measurement Setup ....................................................................13
2.1 Interfaces at the TRX...................................................................13
3 Methods.......................................................................................15
3.1 Normalization...............................................................................16
3.2 Interpolation.................................................................................16
3.3 Optimal measurement position ....................................................19
3.4 Frequency-offset compensation...................................................23
4 Results, discussion and future work.............................................33
4.1 Results ........................................................................................33
4.2 Discussion...................................................................................36
4.3 Future work .................................................................................39
5 Conclusions.................................................................................40
References................................................................................................41
Appendix A. LabVIEW VIs.........................................................................43
Appendix B. I/O Summary.........................................................................74
Appendix C. Labview Main Panel Description ..........................................76
Appendix D. Equipment.............................................................................77
Appendix E. Gamma Bus Format ..............................................................78

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