> I got two peaks at > 5.4995GHz and 5.5005GHz > when the tx_rate is 1M samples per second. > http://www.cse.msu.edu/~huangpe3/usrp/1Mtx_05Msine.png > I thought it is right, sampling frequency is twice the sine frequency. >
Its under-sampled, thats why it looks so bad. > However, when the tx_rate is 2MSps, I got one peak at 5.5005GHz. > http://www.cse.msu.edu/~huangpe3/usrp/2Mtx_05Msine.png Now that that looks better. > Then I am confused. Where does the lower frequency part go? > Or the first one is actually an aliasing because we need some degree of > oversampling in practice. > > Also I'd like to know where do we remove the lower frequency part (freq(A-B)) > in uhd. > tx waveforms is generating cos(t) + i*sin(t) *not* cos(t). I suggest reading about baseband representation and experimenting in simulation with GRC. -josh _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
