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The results of Q8 board are shown here as an example |
Tips:
Q: Why there are 2 bars in most of the results?
A: That is because of the non-monotonic feature of LC frequency settings. Referring to the LC_count result above, each time the coarse increments, the actually LC frequency drops, resulting two bars on two adjacent coarse settings.
Q: Why there sometimes is another bar of outliers?
A: This is because of the abnormal behaviors of CC2538 chip that it receives frames from other channel rather than the one it listens to. By checking the signal strength of each frames received by OpenMote, the bar outliers responds to frames with low RSSI value (<-85dbm), while the other bars responds frames with RSSI value >-50dbm.
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Raw data
The freq_sweep_tx_result.json files contain the frequency settings and freq_offset of each received frames.
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Frequency Sweep when LC divider is on or off
Setup
Using the same code running for Frequency Sweep experiment above but under conditions when LC divider is turned on and turned off.
Experiment
The experiment runs one time for channel 11, 18 and 26 respectively
Result
Frequency Sweep (SCuM → OpenMote)
6 histogram figures (one figure per channel), where:
Y: frequency offset (read value of FREQEST register)
X: frequency settings (from 22.00.00 to 29.31.31)
Divider off
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Divider on
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Divider off
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Divider on
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Divider off
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Divider on
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Frequency Sweep (SCuM ← OpenMote)
6 histogram figures (one figure per channel), where:
Y: number of pkt received
X: frequency settings (from 22.00.00 to 29.31.31)
Divider off
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Divider on
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Divider off
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Divider on
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Divider off
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Divider on
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Raw data
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