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Excel sheet to estimate range for Indoor and Outdoor

Genius 16330 points

Replies: 80

Views: 100714

Hi,

The attached excel sheet helps to estimate a practical range estimation for indoor and outdoor radio links.

The outdoor is based upon Line-of-Sight (LOS). For the indoor estimation, construction materials can be selected that are between the Tx and Rx unit. The greater the attenuation of the combined material between the Tx and Rx unit, the shorter the distance.

This has been used a lot in TI seminars and is a helpful tool for calculating a realistic and conservative range expectation.

The latest version is available at: http://www.ti.com/tool/rf-range-estimator

Latest version (1.17) has been updated to include:

  • CC2640R2F - 500 kbps (BLE)
  • CC2640R2F - 125 kbps (BLE)

Any feedback is welcomed.

Regards, Richard

 

80 Replies

  • Genius 16330 points

    In reply to Marcel Bootsma:

    Hi,
    Realistically, a 100% efficient antenna does not exist. If the antenna has an efficiency of >80% then this is a good antenna and most whip antennas are in this region.

    For the surface I would just select "Ground" for your calculations.
    Regards,
    Richard

     

  • In reply to RGW:

    What value should be used for an 80% efficient antenna in your spread sheet?

    -1 dB fixed Gain?

  • Hi Richard,

    Is this tool can calculate with 125kbps/500kbps coded with BT5.0 (CC2640R2) condition?
    It seems to use original 125kbps BLE condition is only with around 160 meters but according to TI promote BT5.0 coded portion it can reach 1KM.

    BR,
    Taka
  • 2 launchpads, LAUNCHXL-CC2640R2, activated on 2 separate laptops, using Smart RF Studio.Everything at default settings: Tx power at 5dB, CH 17, PDU length 30, One device on continuous Tx, the other on Rx.
    At 1mega-symbol/sec, indoor range is about ~12m (both 0.125m/s and 1.0m/s at 9% error rate)
    At 0.125mega-symbol/sec, indoor range is about ~14m (70% error rate at 0.125m/s, no reception at all at 1.0m/s).
    I might have done something wrong to give such a short range, but even so, the RATIO between the distances should have been 2 (+6dB, meaning 2x range)

  • Genius 16330 points

    In reply to Marcel Bootsma:

    Yes.

    -1dB corresponds to 80% efficient antenna.

    Regards, Richard

     

  • Genius 16330 points

    In reply to Koby Fruchtnis28:

    With Line of Sight I would expect a much greater distance with your settings.

    Is there any objects between the tx and rx unit whilst testing indoors ?

    How are the launchpads positioned whilst performing the range tests ? height above ground, antenna detuned by external objects (metal desk etc) ?

    Regards, Richard

     

  • In reply to RGW:

    We haven't tested under LOS conditions in this case.
    The launchpads are positioned on a glass table. There are 4 drywalls on the way out of the building to the porch used for the testing. (the office is occupied, so there also some people, and an occasional porch-dove...).

    I've done a similar test with the launchpads slightly elevated from the table (20-30 cm above it), with similar results.

    Regards,

    Koby
  • Guru 248415 points

    In reply to Koby Fruchtnis28:

    Koby: If you place the LPs with the tip of the antennas 1 m apart with the default 50 kbps setting, which RSSI do you see on the received packets?

     OOO until November 25th

  • In reply to TER:

    Hey TER,

    Thank you for assisting:

    What do you mean by "50kbps default setting"? The default in most (all?) BLE demo projects is 1mbps. or is it? I didn't even know there was a 50kbps option under the BLE protocol. I thought the lowest is 125kbps, with coded-8 mode.

    Is there a specific demo project you suggest I run? Or should I test both LP's using Smart RF Studio? (I haven't seen a 50kbps option under Studio, but maybe I've missed it).

  • Guru 248415 points

    In reply to Koby Fruchtnis28:

    Sorry, I overlooked the fact that you used a BLE chip. But the rest applies. To be able to compare numbers it should be LOS with a known distance between the antennas.

     OOO until November 25th

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