RF System Synchronization - LO's
summary
Built a 128-channel massive MIMO rig from X310s that proves spatial multiplexing works, using ref‑clock sharing for LO alignment; ref‑clock sharing shows ~5.5° phase drift at 3.6 GHz over ~10–20°C, daisy‑chaining improves to ~1.5°, while a star LO distribution in n320/n321 yields under one degree of phase drift across 45°C. Direction finding with MUSIC needs deterministic phase/time; practical fixes include NCO phase rotation, IQ phase multiply, and fractional‑delay all‑pass FIRs for fine digital calibration.
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chapters (12)
- 0:00Start
- 1:12Descriptions of some Existing Rf Systems
- 11:54Sine Waves
- 12:58Fixed Offset
- 13:50Worst Case Scenario
- 14:48Receiver Architecture
- 15:14Local Oscillator
- 18:44Reference Clock Sharing
- 20:42Phase Noise Profile
- 21:46Daisy Chaining
- 24:13Star Distribution
- 27:43Digital Compensation
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