I am sorry that i was not able to attach my flowgraph and output waveforms with this mail though i had .If any one need, pls ping me. I will mail those for your view.
On Thu, Apr 5, 2012 at 7:03 PM, senthil murugan <amrita.sent...@gmail.com>wrote: > Hi all, > > I have some doubt on the time domain view of bpsk signal generated in > Gnuradio and usrp. I used psk mod block in GRC (sps =2) and created bpsk > (baseband )waveform with vector source producing 0,1,1 continuously. > > When I plotted the output of psk mod block using scope sink, I seen > waveform of constant 1 for some samples (for 0) , inverted root-raised > cosine waveform (for 1) and another inverted root-raised cosine waveform > (for 1). This is repeated continuously and i understand that it because of > transmit pulse shaping. > > Now, the question is when I give this signal to USRP for transmission, how > the time-domain view of that waveform look like? Will it look like > sinusoid signal with 180deg phase shift as we all seen in stand. > communication text books? I guess it will not the case. I tried > multiplying the baseband waveform with signal source (complex) -- > mathematical equivalent of what happening in usrp -- and seen waveform. No > smooth shift of 180deg. > > If anyone having usrp and digital oscilloscope, could you please send me > the pic of time domain view of output of usrp? > > Thanks > Senthil > -- http://amritasenthil.wordpress.com/
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