I'm trying to test an equalizer against group delay distortion of a satellite communication link. According to the CCSDS standards, It is agreed to simulate high-order modulation system with in-band group delay variation of corresponding to 10% of the symbol duration. Suppose filtering is done by a very basic low-pass FIR filter with a Z-transform h(z):

  1. How can the group delay variation be included in h(z)?
  2. Following [1], how can it be implemented in gnu radio?

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