nRF52811 for AoA on Receiver Side and nRF52832 On Transmitter Side

Question

Hi, 
 Is possible for the nRF52811 to measure AoA on the receiver side with nRF52832 on the transmitter side? 
 Thank You, 
 David

Michael McClary at CloudLeaf · Answer

As I understand it, the CTE is an (unwhitened) all-ones pattern, transmitted after the CRC. 
 It seems to me that, if the radio hardware can be commanded to send a long enough cell, then even if it insists on adding the CRC and doing whitening, the soft device could (at some CPU cost) do this: 
 
 Once the cell to be transmitted is formed... 
 Compute and append the soft device's own CRC, then 
 Having computed its own copy of the whitening pattern, append a bunch of anti-whitened all-ones bytes. 
 Then hand the result to the radio... 
 Which dewhitens the all-ones pattern and adds its own CRC to the end. 
 
 So if the soft device could be hacked to do this, say to advertising packets (which are constant and have a long time to be pre-processed), you'd have a software upgrade that could let chips like the nRF52832 or nRF52840 act as AoA senders with no hardware changes; and not a lot of extra crunch. 
 The last byte of the transmitted packet would be garbage (thus violating the standard). But if the AoA receiver is programmed to ignore it, this should just work.