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CALCULATION MAX PPDU LENGHT IN A G3 PLC PROJECT EXAMPLE

Andrea Rendine
Intellectual 580 points


Hi everybody,

I'd like to understand how is correlated the: UINT16 length;  -> // PPDU buffer length in bytes of the G3_EXAMPLE_PHY_PROJECT with the other parameter as: number of subcarriers, number of tones, data rates, modulation etc.

For example, I tried to modify the lenght from 73 to 85 and the TMDSPLCKIT-V3 doesn't send the paket. So, what is the relationship?

I hope for your support,

Best,

Andrea

  • 0
    TI__Expert 6795 points
    Hi Andrea,

    Have you checked Physical layer specification(section 5.2: SYSTEM FUNDAMENTAL PARAMETERS) for length calculation formula?
    You cannot just change the data length. Please look at the formula and check what all values you have to modify.

    Thanks,
    Katta
  • 0 in reply to Rajaravi Krishna Katta
    Intellectual 580 points

    Hi Katta,

    Thanks for the support.

    I checked PHY specification and I found two formula:

    --THIS IS THE FIRST:

    ---THIS IS THE SECOND:

    Now my question is: The "//Length of PPDU payload in bytes " in the C-code is referred at the first forumla or at the second one?

    I know that based on the sort of modulation, rate etc I have to adjust the forumla but I have not understand the concept of the SYMBOLS to put in the formula, e.g:

    Can you help me to understand how I have to use the formula?

    Thanks,

    Best,

    Andrea