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I’m trying to receive, and send, traffic on a fixed but unknown carrier
frequency within the passband of the USRP. That is, there are many
communication bands, but transmissions happen on only one of k channels.
The trivial approach is to have one translating filter, with a channel
select filter, for each channel and hook them all in parallel to the
receive chain. Then to respond I can have k different callbacks, one for
each channel, which will cause response packets to be sent to one of k
different transmit paths corresponding to the different channels.
Does anyone see a more elegant way to do this? I can imagine that using
an FFT I can discover on which channel a transmission occurs, but AFAIK
there’s not a good way for one GNU Radio block to tune another (e.g.
tuning the xlating filter with the FFT).
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