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5. Some signal encoding schemes are "self-clocking" such that they derive the bit synchronization from the signal itself. This is achieved using the transitions between positive and negative voltage levels to help define the boundaries of the bit intervals. [10 points] a) Using NRZ-L, plot the signal for a sequence of n consecutive 1s followed by n consecutive Os. Explain why this code has a synchronization problem. Choose n to be greater than five, e.g., n = 6. b) Repeat (a) above using NRZ-I. Does this scheme have a synchronization problem? c) Repeat (a) above using Differential Manchester. Explain how the synchronization problem is addressed. What is the cost in terms of bandwidth due to going from NRZ to Manchester encoding? 1