This video explains how constellation diagrams can be used to diagnose various types of signal impairments in RF digital communications systems.
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Timeline:
00:00 Introduction
00:14 Suggested viewing
00:30 About constellation diagrams
01:33 Constellation vs. vector diagrams
02:18 Diagnosing modulation issues
03:31 Phase errors / phase noise
04:21 Compression
05:12 Noise
05:41 In-band spurious