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high background noise level measured in SmartRF Studio

Zhiyong Li (FT)
Expert 2920 points
Part Number: LAUNCHXL-CC1352P


Hi,

I am trying to use SmartRF Studio + Launchpad as a practical tool to survey the environment noise floor at our installation sites. If I select the settings as we plan to use on actual CC13XX radios, and set launchpad to continuous RX mode, I get some seemingly high numbers, -105dBm for LRM, and -98dBm for 50kbps 802.15.4g, -90dBm for WB-DSSS, with no known 900MHz emission sources nearby. Are such numbers expected in typical urban environment? Or we shouldn't treat the RSSI numbers from continuous RX as background noise level? 

The reason I am asking is, if such high environment noise is typical, then neither LRM nor WB-DSSS increases range much in real life. In range estimation tool (v1.22), the sensitivity level of CC13XX-5kbps(LRM) is listed as -120dBm. Once the environment noise floor is set at -105dBm, the estimated range of LRM becomes more or less the same as 802.15.4g 50kbps.

Please advise.

ZL

  • +1
    Mastermind 6590 points

    -100 dBm background noise is not very high, I have seen cases with up to -80 dBm or even higher, typically in China and India. One reason is LTE with some of the bands close to the ISM bands. The energy from the LTE bands will no some extent also go over in the ISM bands, typically in line of sight to a base station.  

  • 0 in reply to TheGhostOf
    Expert 2920 points

    Hi,

    Thanks for your reply. I thought it was high until I started to survey background noise of 2.4GHz frequency band. I see up to -50dBm when close-ish to WiFi routers.

    Best,

    ZL