A. Assume that the power of a noiseless signal is 10 mW. The signal passes through five stages of an amplifier. Each stage doubles the power, but it also adds 10 μw of noise to the signal. What is the...

A. Assume that the power of a noiseless signal is 10 mW. The signal passes through five stages of an amplifier. Each stage doubles the power, but it also adds 10 μw of noise to the signal. What is the SNRdB of the signal after it leaves the last stage?

B. What is the SNRdB when we quantize a human voice using 8-bits per sample?

C. We have a 5 kHz baseband channel. We need to send data at the rate of 40 Kbps using this channel.

a. What should the number of bit levels be to achieve this rate?

b. How should the quality of the channel (SNR) be improved to achieve this rate?