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CC2640: Angle of Arrival (AoA) connectionless CTE

elehab gmail
Prodigy 100 points
Part Number: CC2640

Hello,

We are working on AoA. We examined the AoA projects. Example project is using connection CTE. However in our project we want to use connectionless CTE. There is no example for connectionless CTE in SDK or e2e.ti forum. Is there any example of connectionless CTE? If not;

1.)How can we add CTE to advertising packet?

2.)What is ideal value for advertising interval ?

3.)In connection CTE format, when RFcore detect CTE packet(after 3.25us), Rf core triggers an event. And then we take  IQ samples from specific register. Is it same for connectionless CTE? That is, does it trigger any  event connectionless CTE packet is received and can we take IQ samples from same register address?

4.)What is packet sending rate in connection CTE? What are the differences in terms of performance between connection and connectionless CTE?

5.) Do you plan to make antenna that covers 360 degree? Or is there an antenna you can suggest? 

  • 0
    TI__Guru 57865 points
    Hi Elehab,
    We do not offer connectionless AoA (BT5.1) as of now. However, with SDKv2.30, you will be able to evaluate an proprietary AoA implementation with the tone embedded in the advertising payload. Please note that from SDKv2.40, we have moved over to connection based AoA.
  • 0 in reply to J Lindh
    Prodigy 100 points
    Thanks for quick reply.

    What can you say about other questions?


    Regards,elehab.
  • 0 in reply to elehab gmail
    TI__Guru 56215 points
    Hi,

    1. You can't add CTE in periodic advertising packets as of today in our SDK. If you want to use normal adverting packet, then you can take a look at our 2.30 SDK solution as suggested by Joakim.

    2. The advertising interval all depends on your system requirement. Lower average current consumption will require less frequent advertising packets. Better/quicker response will then need a shorter advertising interval. The minimum interval for official solution connectionless AoA is 7.5ms which is only applicable for periodic advertsing. Using our 2.30 SDK, you are free to do whatever interval you want.

    3. We don't have the solution yet, so I can't give you any information regarding how the connectionless AoA will work.

    4. The rate(interval) between connection CTE and connectionless CTE can be the same(minimum 7.5ms). However, connection CTE does require device to establish connection and then you can establish a secure link(secure connection) between your master and slave devices. Then after that, only identified device can request sender to send CTE tone which optimizes the overall power consumption usage.

    5. The current BOOSTXL_AOA design can cover circular area around it. Let's say if you take a look at antenna array 1, it will cover both front and back, it's just based on the I/Q data, you won't be able to determine whether it comes from the back or front.
    That's where the 2nd antenna array comes in.
    For antenna array 1, if you place at the sender in front of the array 1 with 0 degree angle or at the back of the array 1 with 0 degree angle, it will all report angle = 0.
    However, if you place in front of array 1, array 2 will see it as +90 degree.
    If you place it at the back of array 1, array 2 will see it as 0 degree. Then based on the result of array 1 and array 2, you can determine where the sender comes from.