Thank Kyeong Su Shin. Is there any chance of loosing information if I convert complex data back to 16bit as you suggested? I think it would loose information?
Regards, Munir On Wed, Jan 3, 2018 at 12:16 PM, Kyeong Su Shin <kss...@uw.edu> wrote: > Hello M.Munir, > > By default, USRP gives you data in 16bit integer format (x2, for I and Q). > GNU Radio's complex data type uses IEEE754 single precision (x2, for I and > Q). The data type is converted by UHD (the USRP driver). Each IEEE754 data > point requires 32bit of storage (or memory, bandwidth, etc). This is why > the data size is doubled. > > You can set the UHD block to output the raw int16 (interleaved) data, or > you can convert back the GNU Radio's complex data type to a int16 based > format and then send them over TCP (*make sure that you re-scale the I-Q > data, as the complex data is normalized to [0,1] by UHD). > > Regards, > Kyeong Su Shin > > On Wed, Jan 3, 2018 at 2:25 PM, Muhammad Munir <mmmunir...@gmail.com> > wrote: > >> Dear All, >> I am confused to understand a behavior of GNURADIO USRP Source block. The >> problem is, >> 1. I connected USRP N200 with my PC. >> 2. I set both the cahnnels of USRP >> 3. I set the sampling rate of both as 5MHz >> 4. I connected one channel directly to the Frequency Sink Block >> 5. I connected the 2nd channel with TCP sink to transfer data of channel >> 2 to the other PC. >> 6. When I started the flow graph and checked for data rate on system >> monitor, >> I was receiving data at 40MBps and sending data was at 80 MBps. >> Can anyone explain this behaviour? >> Is it the issue with Gnuradio USRP source block? >> I read a long before that UHD block gets samples from USRP and combine >> two samples into single for comples output. If it is, then It should not >> affect the data rate? >> >> Kind Regards, >> M. Munir >> >> _______________________________________________ >> Discuss-gnuradio mailing list >> Discuss-gnuradio@gnu.org >> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >> >> >
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