$($b$)$ Using the ASCII code, sketch the voltage waveform corresponding to the letters $"$Po$"$ if the bit rate is $10$

Mbit$//$s$,$ average power is $1$ and NRZ pulse shape is used? $($In practice, we assume that bit

$"0"$ and $"1"$ happens $50\%$ of the time in an actual bit sequence and the average power of

the bit stream is equal to the average power of bit $"1"$ and bit $"0"$ waveform$)$

$($c$)$ If this signal is to be transmitted in a copper wire, what should be the minimum

bandwidth of the copper wire?