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How much in dB should the SNR per symbol be increased for a 16QAM signal compared to QPSK to have the same Symbol Error Rate?

How much in dB should the SNR per symbol be increased for a 16QAM signal compared to QPSK to have the same Symbol Error Rate? Assume both signals have the same symbol rate and use a pulse shaping of raised cosine with alpha=0.5 Do not include the unit in your

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