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LAUNCHXL-CC1310: RSSI dynamic range and distance estimation

Mike Persson
Prodigy 80 points
Part Number: LAUNCHXL-CC1310
Other Parts Discussed in Thread: CC1310

Hi!

I have done measurements for RSSI / Distance with the CC1310. 120 measurements were made per distance, at distances between 2 m and 1.8 km, in Line-Of-Sight. But from ~220 m, the RSSI values are stuck at -104 dBm. I just want to make sure that these measurements are plausible. Has anyone got similar results or do you think that we should redo these measurements?

If this is how the CC1310 LAUNCHXL should be working, are there any ways to improve the dynamic range of the RSSI?

Picture 1 show the average RSSI / distance, and picture 2 show the original RSSI values / distance.

  • 0
    TI__Guru**** 317180 points
    Are the numbers in the graph RSSI for a successfully received packet?

    Which settings do you use?
  • 0 in reply to TER
    Prodigy 80 points
    Our code is built upon the rfWsnNode and rfWsnConcentrator examples from the SDK. We haven't checked the initial settings and the only thing we have changed is the RF power, which is now set to 13 dBm.

    Yes the numbers on the Y-axis are RSSI for successfully received packets. The X-axis is distance in meters.

    What settings do you think are relevant?
  • 0 in reply to Mike Persson
    TI__Guru**** 317180 points
    You should get a 6 dB change for a doubling of distance. From the data you present it's not possible to see if that is the case since you just have a few measuring points for the longest distances. Looking at the data up to 200 m the variance in one point is significant and hence you need more points for > 200 m to get enough data.
  • 0 in reply to TER
    Prodigy 80 points

    We will redo the measurements and come back with new results, as we found some issues with our implementation.

    So far, Thank you!