Hi, I have implemented time synchronization between two USRPs without GPSDO, MIMO cable or referring to computer's time.It's a sender-receiver method based on message exchange. It will be included in my next paper soon. I use the tx_time and tx_sob tag to transmit the message at the planned time. When this message researches the receiver, I can get the receive time via rx_time tags. The transmit and receive time of tx tags and rx tags are recorded in USRP motherboard without the jitter of Ethernet cable or operating system. So I think it could achieve the best accuracy without modifying FPGA. The experiment shows the accuracy is around 160us. I think it's mostly caused by the jitter of the tx tag's time. I wanna achieve better accuracy than this and the best way is adding a hardware timestamp module in FPGA. Is this way feasible? As for now, I wanna get a depth understanding of the implementing of tx tag,so I will know the accuracy limit of this method. But I'm not familiar with the FPGA, so could anyone describe how tx_time tag implemented or give me some documents about this? Thanks in advance.
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