Second Moment classic SNR estimation fourth moment, there is not through the sampling, the shaping filter and sampled, two versions of shaping filter. Plus noise mode were also comes with a matlab function and self-written versions. Hope you reference.

M2M4 SNR estimination\M2M4_noUPSamp_noShaping.m
.....................\M2M4_noUPSamp_noShaping_QPSK_128_datMEAN.fig
.....................\M2M4_noUPSamp_noShaping_QPSK_128_datMEAN.mat
.....................\M2M4_noUPSamp_noShaping_QPSK_128_datNBias.fig
.....................\M2M4_noUPSamp_noShaping_QPSK_128_datNBias.mat
.....................\M2M4_noUPSamp_noShaping_QPSK_128_datNMSE.fig
.....................\M2M4_noUPSamp_noShaping_QPSK_128_datNMSE.mat
.....................\M2M4_noUPSamp_noShaping_QPSK_128_datVAR.fig
.....................\M2M4_noUPSamp_noShaping_QPSK_128_datVAR.mat
.....................\M2M4_UPSamp_Shaping.m
.....................\M2M4_UPSamp_Shaping_QPSK_128_datMEAN.fig
.....................\M2M4_UPSamp_Shaping_QPSK_128_datMEAN.mat
.....................\M2M4_UPSamp_Shaping_QPSK_128_datNBias.fig
.....................\M2M4_UPSamp_Shaping_QPSK_128_datNBias.mat
.....................\M2M4_UPSamp_Shaping_QPSK_128_datNMSE.fig
.....................\M2M4_UPSamp_Shaping_QPSK_128_datNMSE.mat
.....................\M2M4_UPSamp_Shaping_QPSK_128_datVAR.fig
.....................\M2M4_UPSamp_Shaping_QPSK_128_datVAR.mat
M2M4 SNR estimination

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