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Hi, i'm a student university and i made a QPSK modulator with Altera Stratix II and i don't understand how set NCO for an phase modulation and how define the constallation mapper....
thx for support
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The steps for qpsk are:
get your data bits(0,1) as pairs
map pairs to two separate I,Q streams (as +1/-1)
shape the pulses but I assume this step is too much for Uni student so ignore it
multiply each of I,Q streams by cos/sin in a complex multiplier(mixer)
The output of multiplier will be the modulated qpsk (centerd on your chosen nco frequency)
The +1/-1 will simply invert or leave the phase of your cos/sin (0 or 180 degrees)
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