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I am new to digital communications and trying to understand the basic underlying concepts of digital comm systems. So far , studying the course , I have some questions which if anyone can answer would be great.

In the transmit section, to represent the data (be whatever modulation we are using or No modulation), we have to represent bits/symbols (bits-no modulation, symbols-with modulation) in terms of pulse shaping function. Am I right?

And mostly we use root raised cosine signal to represent the symbols in order to restrict the leakage and have square(approx) shaped spectrum

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  • $\begingroup$ Hi Ash! Welcome here! Please don't ask 3 different questions in one question; ask three separate questions here! I know you're probably still question-rate limited as new user, but the idea really is that we post one answer to one question, so that we can discuss things en detail if we're experts. $\endgroup$ – Marcus Müller Jan 13 at 10:10
  • $\begingroup$ your question A) for example could be summed up with "No, that's not really how it is, but…"; now, if I have two other unrelated questions to answer, I can't go into depth here. Is it OK if we simply remove B) and C) and let you ask these in two new questions? $\endgroup$ – Marcus Müller Jan 13 at 10:12
  • $\begingroup$ It would also help if you could read all related answers on this site and point out what you still don't understand, as specific as possible. These questions have been asked several times before. $\endgroup$ – MBaz Jan 13 at 13:57
  • $\begingroup$ @MarcusMüller Thanks for your replay and pointing out . I will update the question and start my question with part A . $\endgroup$ – Ash SDR Jan 13 at 14:35
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    $\begingroup$ you cannot not do pulse shaping. That's physically impossible. No channel has infinite bandwidth. $\endgroup$ – Marcus Müller Jan 13 at 16:43

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