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Dear Sir: I am simulating a frequency division multiplexing of K channels. The sources are random integers. The modulation is QPSK. =What kind of lowpass filter shall I use? =How shall I do the frequency shift (expj) in simulink? Should I do it in frequency domain? =Should the normalization be done in time domain? And finally, =How shall I see the spectrum results? Is it done with spectrum scope? I used it but it didn't work. I have attached the figure. Thanks, Susan |