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DC blocking in DSP

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    • March 15, 2016 at 4:42 am #32843
      Dr. Dhiman Kakati
      Participant

      Hello Everyone,
      I am trying to understand the internal structure and algorithm associated, In the preprocessing step of the DSP block there are 3 steps among the I am not getting as following.

      The DC blocking is applied to offset any imperfectly biased voltages in the modulator. So how it has managed to offset i.e. the mechanism related with it. it says that imperfectly biased is that mean that while giving the bias voltages at the modulator properties we have done mistake. If we could know the mechanism of how the DSP is managing to solve the problem.

      and in the normalization step of 16-QAM DSP there is “the received signal is normalized to the 16-QAM grid [-3 -1 1 3]” I am not getting what is 16-QAM grid [-3 -1 1 3].
      Thanking you in advance.

      Regards,
      Dhiman Kakati

    • April 8, 2016 at 11:10 am #36116
      Dr. Dhiman Kakati
      Participant

      I am not getting any kind of response in most of the query, While I am trying my best to solve the issues in the forum. I can expect some response.

      Regards,
      Dhiman

    • May 3, 2016 at 7:18 pm #38801
      Rajguru M. Mohan
      Participant

      Hi,
      The removal of a dc bias (a constant-amplitude component)
      from a signal is a common requirement in signal
      processing systems. Thus, a good dc blocking algorithm is a desirable
      tool to have in one’s bag of signal processing tricks.
      I don’t know which technique if DC blocking is used in DSP of optisystem. But generally, we have nonlinear phase fixed-point dc
      blocker (using a noise-shaping trick that
      eliminates a signal’s dc bias using fixed point arithmetic) and a general linearphase
      dc blocker network that may prove useful in various DSP appllications.
      FIXED-POINT DC BLOCKER
      Simple fixed-point implementations of a
      dc blocker algorithm have a vexing quantization
      problem that can create more dc
      bias than they block.

      Thanks,
      I will try to find out solution of your problems

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