I use the TLSR8278 kit to make AOD.

My system consists of two transmitters (made up of 8 antennas each) and one receiver(with one antenna). I use the RF_AOA_DEMO demo provided by Telink. Departure and elevation angles are displayed via the UART.
I made a difference between the two packets sent by the transmitters so that the receiver can know which signal is received: 

emitter1(200 ms)

emiiter (250ms)

Receiver:

The problem is that the two signals overlap and therefore the angle values ​​are not good. how can I solve this problem?