Hello Benny Alexander: What is meant is that you must multiply your samples by a constant number, 1.0/(2**15-1), to scale it from 0 - 32767 to 0 - 1 (range accepted by the USRP).
Regards, Kyeong Su Shin On Mon, Dec 11, 2017 at 8:50 AM, Benny Alexandar via USRP-users < usrp-users@lists.ettus.com> wrote: > Hi Anon, > > You mean make the input to complex, by multiplying with cosine ? But the > input file is already complex and by adding the block Ishort to complex" > its already complex. Why again multiply by cosine with low amplitude ? > > -ben > ------------------------------ > *From:* Anon Lister <listera...@gmail.com> > *Sent:* Monday, December 11, 2017 7:34 PM > *To:* Benny Alexandar > *Cc:* usrp-users > *Subject:* Re: [USRP-users] Gnu radio IQ streaming > > Add a multiply block after ishort and multiply by 1.0/(2**15-1) or > thereabouts. (If you only are using 14 bits of that 16 b, do 14) > > On Dec 10, 2017 07:00, "Benny Alexandar via USRP-users" < > usrp-users@lists.ettus.com> wrote: > > Hi, > > I want to stream an IQ file base band signal using usrp. The format of IQ > signal is 16bit complex values of I and Q each interleaved and having > sample rate of 48kHz stored in a file as follows [IQIQIQ....]. I created a > flow graph in usrp by selecting file block as source and used the block > "Ishort To Complex" and passed the output to rational resampler with > interpolation factor as 250 and decimation 48. This is to upsample from > 48kHz to 250kHz for usrp to stream it. Usrp is connected as sink and set > the sample rate as 250kHz. Output of usrp is not able to decode. When I > checked with FFT sink I can see the spectrum, but lot of noise is being > added, noise floor is too high. The baseband signals in the file doesn't > have any noise. > What could be the problem. Please help in streaming an IQ file using > gnu-radio and usrp. > > Thanks, > Ben > > _______________________________________________ > USRP-users mailing list > USRP-users@lists.ettus.com > http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com > > > _______________________________________________ > USRP-users mailing list > USRP-users@lists.ettus.com > http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com > >
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