<snip> > If what you really mean is that you have a host PC generated sample > stream at 15.36 Msps and need to transmit it with the USRP2, then yes, > you'd set the USRP2 FPGA interpolation to 6, then fractionally > resample from 15.36 Msps to 16 Msps on the host. > > Depending on what the last DSP processing stage in your application > is, you may be able to "fold" this resampling into the prior stage. > For example, if the last step in your signal processing chain is a > spectral shaping filter, like a root-raised-cosine filter, then you > can reimplement this using a polyphase resampler and use the output > filter taps there. This would combine the filter and resampling > operation in one block and eliminate the need for a very high CPU > resampling block. > > Where does the figure of 15.36 Msps come from?
Just a guess, but that sounds like 4x the UMTS chip rate (which is 3.84 Mchips/sec). If this is the case, there is an RRC filter at the last DSP stage typically, so your suggestion for folding this re-sampling in is spot-on. -- Regards, John Orlando CEO/System Architect Epiq Solutions www.epiq-solutions.com _______________________________________________ Discuss-gnuradio mailing list [email protected] http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
