Consider a coherent orthogonal MFSK system with M $=8$ having the equally likelywaveforms s$,($t$)=$ A cos $2$ft$,$ i $=1,...,$ M$,0$ St T$,$ where T $=0\mathrm{.}2$ ms$.$ The received carrier amplitude, A$,$ is $1$ mV$,$ and the two$-$sided AWGN spectral density, N$,/2,$ is$10-$ W$/$Hz$.$ Calculate the probability of bit error, PB$-$