|Subject:||USRP source starts to receive after certain samples|
|Date:||Wed, 16 Jun 2021 10:05:30 +0100|
I am very new to Gnuradio and USRP, and I have a question about the code transmission delay between USRPs.
I have two USRP E310 with UBX160 daughterboards. I send a sequence of code from one USRP using simple amplitude modulation, and receive it by another USRP. On the receiver side, I use a replica of the code to cross-correlate with the received code to compute the transmission delay. However, I can’t explain this delay I obtained:
Also I recorded the date received by the USRP, it clearly shows that, no matter the sample rate is, the USRP source starts to receive the code after the 41st samples, and before are some strange values. You can find them in the attached plot.
My questions are
(Additionally, both USRPs have their 1 PPS and frequency ref synchronized to the external high quality atomic clock. And I set them to start transmit/receive data at exactly the same time.)
I appreciate a lot for any comment or advice !
Description: PNG image
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