H() 2 0,02*X 2 - 0,02*X f(kHz) -23 -21 -20 -19 19 20 21 23 A) Using the filter given above, for X = 100, if the message signal x(t) = cos(277500t) is to be transmitted with Lower Single Sideband modulation, what should the modulator structure be like? Draw the modulator structure. B) Find the range of values the carrier frequency can take and express in time the signal at the modulator output for an appropriate carrier frequency. Draw the sign you wrote the time expression using MATLAB. (!!! Please include the MATLAB codes as well.)