7.16 A signal can be modeled as a lowpass stationary process X (t), whose probability density function (PDF) at any time to is shown in Figure P-7.16. -2 fx(x) 1 bus X eldsney mobast owl ELT 2 X Figure P-7.16 The bandwidth of this process is 5 kHz, and we desire to transmit it using a PCM system. 1. If sampling is done at the Nyquist rate and a uniform quantizer with 32 levels is employed, what is the resulting SQNR? What is the resulting bit rate? 2. If the available bandwidth of the channel is 40 kHz, what is the highest achiev- able SQNR? 3. If, instead of sampling at the Nyquist rate, we require a guard band of at least 2 kHz and the bandwidth of the channel is 40 kHz, what is the highest achievable SQNR?