Q$18$: A certain message having $\frac{f^2(t)}{|f(t{)}_{\text{m}\text{i}\text{n}}{|}^2}=0\mathrm{.}09$ is transmitted through a channel having PSD watt$/$ Hz $.$

If the signal power at receiver input is $0\mathrm{.}1$ watt and the signal bandwidth is $3$ kHz $,$ find:

$($a$)SN{R}_{dB}$ at $Rx$ input if $A\frac{M}{D}SB-SC$ Mod. Is used.

$($b$)2-SN{R}_{dB}$ at $Rx$ output if standard AM Mod. With $m=0\mathrm{.}5$ is used.

Ans: $28\mathrm{.}23dB,11\mathrm{.}66dB.$