On 10/18/2012 04:47 AM, Bilal wrote: > Hi > I m using USRP2 and USRPN210 DB RFX900. > > Block diagram > MOD:random source-->ofdm-->usrp sink > DeMOD:usrp source-->ofdm demod-->>sink scope,fft > > Problem is that: > Modulation is going fine,even at the receiver end the spectrum is just like > it should be (block for OFDM ) > but there is nothing at the output of OFDM demod block Sink Scope is showing > nothing. <http://gnuradio.4.n7.nabble.com/file/n38053/OFDM_DeMOD.png> > <http://gnuradio.4.n7.nabble.com/file/n38053/OFDM_Mod.png> > <http://gnuradio.4.n7.nabble.com/file/n38053/Spectrum.png> > I have attached the mod,demod,received spectrum snaps. > Help is highly appreciated...:-) >
1 few things: 1) Remove the throttles, the sample rate is already throttled by the usrp. There will be a fight. 2) I see an exception printed in the GRC window for one of the screenshots. That might be important to share? 3) The random source should probably be 0 to 1 << 32. I believe thats a 32 bit integer stream. Things might not work as expected when the input bits are mostly 0. -josh _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
