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 <[email protected]> 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" <[email protected]<mailto:[email protected]>> 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 [email protected]<mailto:[email protected]> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
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