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LAUNCHXL-CC1310: Help on RF Parameter Concepts

JEnginnerHW
Prodigy 70 points
Part Number: LAUNCHXL-CC1310
Other Parts Discussed in Thread: CC1310

Tool/software:

Hello.
I am working with the generation of RF configuration files FOR CC1310 with SmartRF_Studio7 and I am not very familiar with the following concepts:

- Deviation
- Symbol Rate
- RX BW Filter
- Whitening

Could someone please define them and help me to understand what is the function of each one in the operation of the CC1310 radios.

Thank you very much in advance.

  • +1
    TI__Expert 3410 points

    Hi,

    • Symbol rate (symbols/second) is the rate at which symbols are transmitted. In the case of 2-FSK modulation the symbol rate equals the data rate (bits/second). For the same modulation the higher the symbol rate the higher the data rate.
    • 2-FSK uses two different frequencies to transmit symbols. One with a positive deviation and another with a negative deviation from the center frequency. The deviation the should be used depends on the symbol rate and the sensitivity that wants to be achieved.
    • The Rx BW filter depends on the symbol rate, deviation, type of filter and crystal accuracy. The Rx BW should be wide enough to capture all of the signal. Rule of thumb is that it should equal the symbol rate + 2 * deviation.
    • For whitening you can review this document: https://www.ti.com/lit/an/swra322/swra322.pdf. It is written for another CC device, but gives an explanation about whitening.

    I suggest that you use one of the characterized PHYs that are available in smartRF studio and not modify the settings. They have been validated over temperature, voltage and other parameters. 

  • 0 in reply to Diego P
    Prodigy 70 points

    Thank you very much, you have been a great help.  :)