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CC1352P: Environmental noise immunity of sub-1G

Wilson Chen80
Intellectual 380 points
Part Number: CC1352P

Hi TI,

Subsequent to certain discussion of noise (level): e2e.ti.com/.../3479641

We wonder to CC1352P SW design,

1. AWGN or environment 900MHz anti-noise immunity is the same across 50Kbps and 200Kbps data rate?

2. For the path loss model,

a, What is the proper multipath model TI suggested (2-ray?) to real environment? Already considering the height of DUT antenna size and height?

b, To the Friis formula, distance to be larger than (2D^2/wavelength) are considered as the far-field given (2D^2/wavelength) >> D and wavelength, whereas D is antenna dimension. So for tiny antenna size of DUT seemingly not satisfy the far-field of Friis formula until D approximate 1 meter. Then what is TI suggestion if our DUT antenna size <10cm?

3. Is there denoise algorithm/detector implemented to zero out the time varied (broadband) noise,

a. Like FFT operation to denoise AWGN noise and extract out the wanted carrier tones by setting the proper threshold then iFFT operation to recover it.

b. Like multi-resolution analysis implemented to deal with long time standby low frequency noise with few time high frequency signal case of spectrogram manupulation.

 Thanks!

Wilson Chen

  • 0
    TI__Guru 56590 points

    Hello Wilson,

    1. Sensitivity and blocking is a function of parameters (example RX filter BW, etc). Please refer to the device data sheet section 5.10 861 MHz to 1054 MHz - Receive (RX) and onwards for details.

    For 2. and 3. I have assigned an expert to comment. Please bear with us.

  • 0 in reply to Eirik V
    Intellectual 380 points

    Hi Erik,

    Understood the answer of item 1

    Yes, please share with me the comments on item 2 and 3 thereafter, thanks

    Wilson Chen

  • 0
    TI__Mastermind 29570 points

    Hi,

    1. Using a smaller bandwidth/datarate will always produce less noise in the receiver.

    2a. A smaller antenna will always have a lower Mean Effective Gain. There are several antennas that can be chosen in the drop down menu that are physically different sizes. The range tool needs to be a general tool for the broad market. Specifying, the exact antenna size in relation to wavelength is not so useable for this tool. 

    2b.Please view the tool as a better range estimation compared to the standard Friis forumla. Otherwise, a general range tool cannot be provided if this is to cover all physical parameters. 

    3.  For LRM PHYs, CC13xx uses a well-known and established method to obtain sensitivity gains by means of coding and spreading the information bits into a series of transmitted symbols. The LRM are clearly marked in the drop down menu when choosing the PHY.

    Regards,

        Richard

  • 0 in reply to RGW
    Intellectual 380 points

    Hi Richard,

    Received answer of Q1 and Q3.

    For Q2, please share characteristic real-world test result of TI launchpad on 50kbps and 200kbps so as we can understand how wide your generic range tool can cover.

    Test location/time around LOS, NLOS testing and their repeatability.

    We need this information from your engineering team rather than from calculation only, in order to know the correlation in between.

    Thanks!

    Wilson Chen

  • 0 in reply to Wilson Chen80
    TI__Mastermind 29570 points

    Hi,

    Test case 1: LP-CC1312R1, 868 MHz, 50 kbps, 14 dBm, NF: -110 dBm : Measured range 1021 m

    Estimated range with excel tool: 885 m to 1289 m.

    Test case 2: LP-CC1352P1, 915 MHz, 50 kbps, 20 dBm, NF: -110 dBm : Measured range 1269 m

    Estimated range with excel tool: 1351 m to 1977 m.

    It is impossible to calculate an exact range, there are too many factors to take into account. Even if all parameters were taken into a simulation, the simulation would be valid for a specific location, fixed set of objects between and close to the Tx and Rx units, fixed environment noise figure with specified atmospheric conditions. 

    Regards,

       Richard