how to plot the waveforms of 4-PSK and 16-QAM with matlab??

[Passband Modulation]

ive encountered such problem working out the waveforms of 4-PSK and 16-QAM with matlab. plz help!


The signal constellations of 4-PSK and 16-QAM are shown in Fig.3.1a and Fig3.1b, respectively.

The amplitude values { a(t), b(t) } are obtained by mapping the information bits into signal values. The mappings for 4-PSK and 16-QAM are shown in Fig.3.1 with the information bits next to the constellation point. The mappings are summarized in Table 3.1

Plot the waveforms of 4-PSK and 16-QAM for the bit sequence {0101000001100111} (i.e. a1b1a2b2a3b3..…, the first two dibits of 16QAM is 00 and 11) with c f =1000 Hz and bit rate of 0.5kbit/sec. The waveform is sampled at the rate of 10kHz.

 

[Communications_Engineer]

do you mean, you want to plot the constellation for QPSK and 16-QAM? or do you mean something else?

 

[Passband Modulation]

yes, communications_engineer, but that, the plot of constellation is what the next question is asking as following, which i didnt post before:

"Generate a sequence of information bits with the length of 16,000. Plot the signal constellation for using 4-PSK for the sequence with the mapping defined in Table 3.1a. Repeat the plot for using 16-QAM for the same sequence with the mapping defined in Table 3.1b."

however, the first question is clearly asking me to "Plot the waveforms of 4-PSK and 16-QAM for the bit sequence {0101000001100111} (i.e. a1b1a2b2a3b3..…, the first two dibits of 16QAM is 00 and 11) with c f =1000 Hz and bit rate of 0.5kbit/sec. The waveform is sampled at the rate of 10kHz."
so do u mean constellation = waveform? just confused with these things....

and overall, there will be total 4 plots/graphs generated by matlab as told by my lecturer. so would you pls help work out the corresponding matlab codes?

 

[alee]

hey did you get the matlab code of the problem you asked. actually i am also stucked in some what similar problem. if you could help me ?