I am working with a LFM up chirp signal, and I wanted to embed some data on it using a BPSK constellation. My doubt was, ¿should I use a RRC filter, like in usual communications schemes, or should I use a rectangular pulse shaping filter? ¿Is there any advantage to use a rectangular pulse shaping filter in this case?

  • $\begingroup$ It's not really a lfm chirp any more if you modulate it with a data signal, so not quite sure how this whole thing works out $\endgroup$ – Marcus Müller Aug 23 '19 at 13:49
  • $\begingroup$ It's a data modulated chirp. You create a data signal, and use it to modulated the LFM chirp. So you can use the signal for radar and communication $\endgroup$ – DaDSPGuy Aug 23 '19 at 14:24
  • $\begingroup$ yeah, but by modulating the chirp it can't be a linear frequency chirp anymore; the phase isn't any longer a quadratic function of time! You can't have a full half moon. $\endgroup$ – Marcus Müller Aug 23 '19 at 14:46
  • $\begingroup$ What do you mean by full half moon? Certainly, the frequency would change. Nonetheless there are techniques to embed data into it a chirp signal, and still have good radar performance $\endgroup$ – DaDSPGuy Aug 23 '19 at 14:52
  • $\begingroup$ I meant that you can't have a "wet dry" thing, or an "even odd" number: you can't have a linear chirp that is also BPSK-modulated. It's self-contradictory. You can have something similar, but can not be LCM anymore! $\endgroup$ – Marcus Müller Aug 23 '19 at 15:02

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