Hi all,
I implemented an OFDM transceiver using two usrps one as the transmitter and one as the receiver , i also did all the synchronization tasks (Frame Detection, Timing recovery, CFO correction, and channel estimation ) necessary to calculate the BER at the receiver and it worked great.
im now trying to emulate a DAS scenario where i have two USRP transmitters sending the exact same OFDM signal, they are seperated by some distance and synchronized in frequency and time using a reference clock. The receiver is a normal OFDM receiver.Thus, the signal received from the two transmitters should be perceived at the receiver side as the same signal coming from one transmitter but with higher power. Moreover, i need to induce nano-second delays between the transmitters using the start trigger time and investigate the effect on the BER is that possible?
My questions are:
1- there any phase ambiguity between the two usrp transmitters after using the reference clock or the MIMO cable ?
2- is it possible to use the Refin and PPS and different trigger time to force specific transmission delays?
Thanks