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Order the following modulation types in terms of spectral efficiency (best to worse) and explain why (be specific, show a number and how you got it): 64-QAM, QPSK, 8-PSK, and BPSK. Assume that the r=0, perfect filtering.

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M = 64 symbols
N = 6 bits/symbol
Spectral efficiency = 64/6 = 10.67 ...

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