Hey, In fact, the mapped complex symbol will go into two parts, that is, the real part and the image part will modulate the cos(w_c * t) and sin(w_c * t), separately. E.g., complex symbol is denoted, y = a+jb = r*cos(theta) + j*r*sin(theta);
so, a*cos(w_c * t) - b*sin(w_c *t) = r*cos(theta)*cos(w_c * t) - j*r*sin(theta)*sin(w_c * t) = r*cos(w_c * t + theta) This is the final transmitted real signals, where w_c is the carrier frequency, shown in Gnu radio as well. >yup..got it..thanks.. >i understood in QPSK how the bits get mapped to constellation space. >One doubt still persists.QPSK modulation theory tells us that we need to >change the phase of the carrier depending upon the incoming data >bits..i.e what we see mapped to the constellation space is the modulated >data. >I cannot see a carrier frequency specified anywhere in bqpsk.y..Where do >i specify the carrier frequency for my transmission...this part is still >a bit hazy... >I can see the incoming bits getting mapped to constellation space not >the modulated data..M i missing something here? >Thanks >Manav >-- >Posted via http://www.ruby-forum.com/. Regards, Robert _______________________________________________ Discuss-gnuradio mailing list [email protected] http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
