Multiple Choice: Digitizer Headroom A QPSK signal needs at least 18 dB of SNR to demodulate reliably. If we need 2 bits of headroom (to accommodate the peak/average ratio of the signal) and we need...

Multiple Choice: Digitizer Headroom A QPSK signal needs at least 18 dB of SNR to demodulate reliably. If we need 2 bits of headroom (to accommodate the peak/average ratio of the signal) and we need the 2 lower bits to always be driven by the noise floor of the receiver, how many bits do we need in the ADC?

a. 2.7 bits

b. 3 bits

c. 7 bits

d. 9 bits