I will update this as I add more functions.

Using it for the unit ELEC4402 Communication Systems

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(* Signal power *)
SigPower[expr_, t_] :=
 Limit[1/(2 T) Integrate[expr^2, {t, -T, T}], T -> Infinity]

(* Normalized sinc function,default Sinc in Mathematica is not \
normalized *)
SincNorm[Infinity] := Sinc[Pi  Infinity]
SincNorm[t_?NumericQ] := Sinc[Pi  t]

(* Fourier transform,frequency in Hz *)
FTfreq[varargs__] :=
 FourierTransform[varargs,
   FourierParameters -> {0, -2*Pi}] /. {Sinc[f_] :>
    SincNorm[Simplify[f/Pi]]}

(* Inverse Fourier transform,frequency in Hz *)
IFTfreq[varargs__] :=
 InverseFourierTransform[varargs,
   FourierParameters -> {0, -2*Pi}] /. {Sinc[f_] :>
    SincNorm[Simplify[f/Pi]]}