Suppose that in a baseband M-ary PAM system with M

Suppose that in a baseband M-ary PAM system with M equally likely amplitude levels, as described in Problem 4.27, the average probability of symbol error Pe is less than 10-6 so as to make the occurrence of decoding errors negligible. Show that the minimum value of received signal-to-noise ratio in such a system is approximately given by (SNR) min = 7.8(M2 – 1)