What causes zero crossings in a QPSK constellation to be a a problem for linearity or PAPR ( Peak to Average Power Ratio)?

  • $\begingroup$ See this answer for a brief description of why $\pi/4$-QPSK generally is preferred over plain QPSK in satellite channels. $\endgroup$ – Dilip Sarwate Jan 15 at 21:17
  • $\begingroup$ how is the constellation for $\pi/4$-QPSK different from plain QPSK? $\endgroup$ – robert bristow-johnson Jan 16 at 16:51
  • $\begingroup$ 135 degrees phase shift for pi/4 QPSK vs 180 degrees for plain QPSK and 90 degrees for OQPSK $\endgroup$ – ali khalil Jan 19 at 12:50

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