Question: Increasing the number of amplitude level and phase shift, we can gain higher level xQAM, such as 64QAM and 256QAM. It seems the transmission rate

Increasing the number of amplitude level and phase shift, we can gain higher level xQAM, such as 64QAM and 256QAM. It seems the transmission rate can be as high as we want by using this kind of modulation. Is it true? Explain briefly.

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