How many different phases would an 8PSK modulated signal wit

How many different phases would an 8-PSK modulated signal with the following constellation diagram have? 4 8 3 1 256 16 A polar NRZ baseband signal is modulated using a 4-PSK (QPSK) modulation scheme. This modulated signal is observed to have a transmission bandwidth of W = 400 MHz. If this same signal was instead modulated using 16-PSK what would the transmission bandwidth be? W= 1.6 GHz W = 400 MHz W = 3.2 GHz W = 1.2 GHz W = 200 MHz W = 800 MHz

Solution

9.number of phases =number of constellation points

so number of phases=8

10.bandwidth of 4PSK=f/2 M=4=2²   n=2

given bandwidth of 4PSK =400MHz

so 400MHz=f/2

f=800MHz

modulating signal frequency=800MHz

bandwidth of 16PSK=f/4 M=16=2⁴; N=4

=800MHz/4=200MHz.