In my question, the PQ refers to Polarization-division-multiplexed quadrature phase-shift keying, and mPPM means m-ary pulse-position modulation. The two modulation formats can be modulated together to form a PQ-PPM hybrid modulation (the article in the annex is about this), what makes me confuse is the SNRsym of PQ-mPPM  is the same as PPM modulation in PQ-mPPM hybrid modulation ?

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