1. The bandwidth of a signal is 4 kHz and we want to transmit it over a channel in PCM form using Nyquist rate sampling. a) If the available bandwidth is 60 kHz, what is the average signal to quantization noise ratio in dB? b) What is the average SNR in dB at the receiver if the available channel bandwidth is c) again 60 kHz but the channel is noisy o that the bit error rate at the receiver is 104 ? If we want that quantization noise is approximately ±0.1 percent of the peak-to- peak analog level, what is the average SNR in dB and the null channel bandwidth needed?