Dave, Thanks for replying.
we are hopping every 80ms. ᐧ On Fri, Aug 26, 2016 at 12:32 PM, Dave NotTelling <[email protected]> wrote: > Ajinkya, > > How fast are you hopping? I've had loads of issues with hopping > rapidly and not having the correct frequencies used. > > -Dave > > On Tue, Aug 23, 2016 at 7:16 PM, Ajinkya D Kadam <[email protected]> > wrote: > >> HI All, >> >> I am using gr-spread >> <https://github.com/CIG-SDR/CIG/tree/master/gr-spread> module to >> transmit a signal using FHSS. When I receive the FHSS signal, the received >> signal has a completely different hopping sequence as from the transmitted >> one. I am using USRP N210 for transmission and reception. I am not sure why >> this is happening. The transmitted sequence is (frequencies in Khz) >> >> 187.5 >> -12.5 >> 162.5 >> -62.5 >> 62.5 >> 137.5 >> -112.5 >> -37.5 >> 112.5 >> -162.5 >> -137.5 >> -87.5 >> 12.5 >> 37.5 >> 87.5 >> >> and the received sequence is >> >> 37.5 >> 62.5 >> 112.5 >> -187.5 >> 12.5 >> 187.5 >> -37.5 >> 87.5 >> 162.5 >> -87.5 >> 0 >> 137.5 >> -137.5 >> -112.5 >> -62.5 >> 37.5 >> 62.5 >> >> I have created a movie out of the images which plots the IQ, FFT and >> WaterFall plot for the transmitted signal and the received signal using the >> "plot_psd_base.py" file in gr-utils. Please have a look at both of them >> here <https://drive.google.com/file/d/0B-Ksc0hMVyDVLW11QW1BekJtS0E/view> >> and here >> <https://drive.google.com/file/d/0B-Ksc0hMVyDVSmU4YzlBVXA5ZFE/view?usp=sharing> >> . >> >> Please see the attached files for the flowgraphs, I am using as the >> transmitter and receiver. >> >> I have stored the received and transmitted signal to a file. Since these >> are large files I have uploaded them to google drive here >> <https://drive.google.com/a/nyu.edu/file/d/0B-Ksc0hMVyDVRTdaVTV5ZmhCVkE/view> >> . >> >> Could someone please help me understand the behavior I am observing ? >> >> Is this some sort of synchronization issue ? What am I missing ? >> >> Thanks in advance. >> >> ᐧ >> >> _______________________________________________ >> Discuss-gnuradio mailing list >> [email protected] >> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >> >> >
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