15. Step 1: Start with two empty lines and one comment line (followed by % and three spaces) : Working with Plots and Figures. Then, write another comment line (followed by % and three spaces): MATLAB codes for Problem 15. Step 2: Write MATLAB statements that will do the following functions: Create an array x of 100 input samples in the range 1 to 100 using the linspace() function, Plot the equation y(x) = 20log10(2x) on a semilogx plot. Draw a solid blue line of width 2, and label each point with a red circle. Now create an array x1 of 100 input samples in the range of 1 to 100 using the logspace() function, and plot the same equation on a semilogx plot. . Draw a solid red line of width 2, and label each point with a black star. 16. Plotting Amplitude Modulated Waves Step 1: Understanding the problem Amplitude modulation (AM) is a modulation technique used in electronic communication, most commonly for transmitting information via a radio carrier wave. In amplitude modulation, the amplitude (signal strength) of the carrier wave is varied in proportion to the 4 waveform being transmitted. That waveform may, for instance, correspond to the sounds to be reproduced by a loudspeaker, or the light intensity of television pixels. The amplitude modulated signal is defined as: AM = (1 + mcos(2fmt) Acos(2fct) Where the low frequency (in the range of 1 KHz ~ 2KHz) intelligence signal is M = A cos(2fmt) the high frequency (in the range of 100 KHz ~ 200KHz) carrier signal is C= Acos(2fct) and m is the modulating index. If m<1 the modulated signal is called under modulated, if m 100%>1, the modulated signal is called over modulated. Step2: First write a comment line (followed by % and three spaces): MATLAB codes for Problem 16. Step 3: Write MATLAB codes to plot three separate figures, where each figure presents the intelligence signal, the carrier signal and the modulated signal in the range t= 0 to 1/fm from top to bottom of the figure for the cases with m<1, m=1, and m<1. Use figure() and subplot() functions. Write MATLAB codes to show xlabel, ylabel, and title in the plots. Consider the amplitude of the carrier/intelligence signal, A=1 V. Choose a value from the range 103 to 2103 for the intelligence frequency fm, a value from the range 100103 to 200103 for the carrier frequency fc.