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RTOS/LAUNCHXL-CC2640R2: LE Coded Phy Channel

erdem simsek
Expert 2165 points
Part Number: LAUNCHXL-CC2640R2


Tool/software: TI-RTOS

Hi everyone,

As you know, bluetooth 5 is introduced and its coverage increases up to 200 meter with the help of the LE Coded Phy.
The difference between LE Coded Phy and standart LE Phy is that how many symbols you spend to code one data bit.
According to the Bluetooth specification, there are two type to encode the data which are 2 and 8 coding.

Here is the point that confuses my mind,

The LE Coded Phy property seems like a software trick to me because, there is no difference between sending data and sending coded data. 
Instead of using CC2640R2 , can i use Bluetooth chips that support Bluetooth 4.2 to use LE Coded Phy. 

Is it possible, if yes how can i do? if no what the physical layer changes on Bluetooth 5 ?

My second question is that;

In S=8 coding in LE Coded Phy, Transmitter will be in on 8 times higher than BLE 1M Phy. This will increase the power consumption of the transmitter.
Is there any work that show the increase in power consumption when S=8 LE Coded Phy is used compared to the BLE 1M Phy or can i say that the power consumption will increase 8 time?

Thanks for your attention
Have a nice day

  • 0
    TI__Guru** 106705 points
    Hi Erdem,

    Coded PHY is not a simple SW trick. There are HW-mechanisms in the receiver that enables it to detect the coded data, it is not done on application level. That is why you are able to receive weaker signals when coding is used.

    The power consumption does not increase when the transmitter runs for a longer periode of time, but the energy consumption does. If you send the same amount of data, the energy consumption will increase when using coded PHY compared to 1 Mbps, but not 8 times. As you can see from www.ti.com/lit/pdf/swra478 a lot of the energy consumption is driven by wake-up and enabling the radio. That being said though, Coded PHY is typically targetting appliactions that will not send a lot of data.

    Cheers,
    Fredrik