Hi John, I think you will need to build your own RFNoC image, but you could probably do it with stock blocks such that you don't need to develop a new block. If you built a 4-channel DUC with each input tied to an SEP (as you suggested) and each output tied to inputs of AddSub blocks. You would need 3 such addsub blocks - two to handle the 4 outputs of the DUC and then one additional to add the 2 AddSub blocks and send the result to the radio. The AddSub blocks would automatically synchronize the streams.
Just as a caution, in my experience when combining multiple streams (as done with the AddSub block), the graph can get blocked if the streams don't always have the same number of samples. For example, let's say you start transmitting on all four streams but then you later stop them sequentially such that the total trailing number of samples on each stream is unequal. Then, these samples will be left in the queue waiting at the AddSub for the next transmit and thus cause the subsequent transmit to be misaligned. Rob On Wed, Mar 12, 2025 at 3:33 AM <carmix...@gmail.com> wrote: > Hi, I’m developing a solution on X310+UBX160 SDR, the solution is the one > depicted in the picture: > > I have 4 streams at 2MHz bandwidth each, but they are spaced each other of > 35 MHz around F0 so that the total frequency span is around 140MHz. Now I > have to transmit these signals on a single X310 channel and 140MHz is well > inside the 160MHz bandwidth. However I would like to save network bandwidth > and computing power and transmit to the radio just the four streams @ 2MHz, > for a total bandwidth of 8MHz. What is the best solution according to you? > I’m thinking of using RFNoC, using for example 4 SEP and merging/shifting > the signals inside the Radio, is it the correct path? Can I combine > existing RFNoCs to obtain such a result or should I have to develop it on > my own? > > Thank you in advance for your support, > > John > _______________________________________________ > USRP-users mailing list -- usrp-users@lists.ettus.com > To unsubscribe send an email to usrp-users-le...@lists.ettus.com >
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