2. (20 points) Consider the characteristics of the following digital communicationsystem. a. (6 points) Show the Fourier Transform X(@) of a signal that sendsrectangular pulses at 200 kbps. Remember to

label all plots completely. b. (6 points) Show the signal x(t) for part (a). c. (5 points) What bandwidth (in Hz) is needed in order to transfer 95% of thesignal energy for this x(t)? d. (3 points) If instead 20 MHz bandwidth was available, what bit rate could be supported with sending 90% of the signal energy?