CC2640R2F: Questions for details of BLE AOA Angle Estimation

bin cai1

Part Number: CC2640R2F

In BLE AOA SDK, we learned that system estimates pairAngle first ,then do some compensation related to RF channels.So here are two questions:

1 . in funtion " AoA_getPairAngles ", after complex product of antenna pairs, SDK adopt an extra compensation :

" (p->sign * antenna_versus_avg[p->a][p->b] + p->offset) *p->gain "

so what does the parameter "offset" and "gain" mean? In ideal system, we think the offset is 0 and gain is 1, is it correct?

2 in funtion " AoAReceiver_estimateAngle ", an extra carrier frequency compensation is adopted based on RF cahnnel, and the question is :

in function " AoA_getPairAngles ", we have " Paa_rel " represent phase shift between two adjacent repetition, so we think the frequency offset is compensated here, so why we need the extra frequency compensation in " AoAReceiver_estimateAngle "?

over 5 years ago

0 Marie H over 5 years ago

TI__Guru* 80931 points

Hi,

Please note we have discontinued AoA on CC2640R2. Please see the statement in the release notes:

0 bin cai1 over 5 years ago in reply to Marie H

Prodigy 20 points

HI Marie

thanks for the reply, sorry that I'm not familiar with search method in release notes you attached. I just find two AOA keywords there so could you tell me how to do a further search ? and do you mean that AOA on CC2640R2 have a phase discontinuity?

0 Clément over 5 years ago in reply to bin cai1

TI__Guru** 101450 points

Hi,

TI has made the decision to discontinue further development and support of the TI-proprietary Angle of Arrival (AoA) on the CC2640R2. We recommend and welcome our customers using AoA on CC2640R2 to transition from the CC2640R2 to the new RTLS examples based on the Bluetooth 5.1 specification which can be used with the CC13x2R and CC26x2R devices. These software examples can be found in the SimpleLink™ CC13x2 and CC26x2 software development kit 3.40 or later which features a Bluetooth 5.1 qualified stack with support of Bluetooth 5.1 Angle of Arrival. To make this transition, here is a list of available resources you can reference: Simple Link Academy, AoA stack users guide, LaunchPad Tool Order Page

If you have any questions about moving to the Bluetooth 5.1 AoA solution or any questions about the solution itself, please post to E2E!

Best regards,

Bluetooth®︎

Bluetooth forum

CC2640R2F: Questions for details of BLE AOA Angle Estimation