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Hi,
Can you please explain more about the CP-PLL synchronization between 2 WARP boards? I'm facing an issue with this cable. After some modification in the 802.11 ref to synchronize the 2 boards, I calibrate the 8 antennas and store the phase shift relative to antenna A on board1 (AGC disabled). After several hours, my AoA algorithm return inaccurate result, so I measure the phase again. It shows that the phase of the 4 antennas on board2 has changed about 20-30 degrees.
I'm wondering if I use the CM-PLL cable for synchronization, should there be any phase drifting problem?
(The relative phase of 4 antennas on board1 are still stable with about 5 degrees variation over time)
Last edited by vutran (2018-Sep-10 04:35:34)
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I've never characterized the long-term (multi-hour) stability of that setup. It's possible the sink node observed a double/missing clock edge due to interference on the reference clock input; that might manifest as a small change in RF carrier phase.
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