Q1. A) Using Matlab, write a code to perform DSB-SC Amplitude modulation and demodulation in presence of AWG-Noise with variance 0.01, 0.1, 1 and 10. (Use coherent detector).Take message signal as a single tone sinusoid with frequency 20kHz and a carrier frequency of 585kHz for your coding. Take 10000 message samples. B) Repeat part A for frequency modulation with carrier frequency of 90.1MHz. You are required to show message signal graph, noise graph, modulated signal graph, noisy modulated signal graph, demodulated signal graph in time domain for both parts.