What's Your Angle? Practical Considerations When Developing Phase Coherent RF...
summary
Describes building phase coherent 4x4 MIMO with a Sidekiq X4 using ADRV9009 phase synchronization, calibrating per-frequency with broadband noise and per-channel complex multipliers. Runs ~1,000 sweeps, measures coherence as low as 0.62 degrees stddev at 1.9 GHz and ~2–3 degrees at 5.8 GHz. Shows calibration math (correlation angle and k scaling), verifies interpolation between cal points, and demonstrates synchronizing multiple X4s to produce 8 phase-coherent channels.
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chapters (13)
- 0:00Phase coherence in SDR
- 1:52Phase locked vs coherent signals
- 3:37Why phase coherence matters
- 5:42Sidekick X4 SDR platform
- 7:08Phase sync in Sidekick X4
- 8:53Calibrating phase with noise
- 10:18Correlation functions for phase
- 13:30Calculating phase correction
- 16:24Applying calibration factors
- 17:05Measuring phase repeatability
- 20:33Verifying calibration across freq
- 23:25Current challenges and future
- 24:30SDR development and hiring
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