A signal band-limited to 1 MHz is sampled at arate 50% higherthan the Nyquistrate and quantized into 256 levels by using a u-law quantizer with u = 255. (a) Determine the signal-to-quantization-noise ratio. (b) The SQNR (the received signal quality) found in part (a) was unsatisfactory. It must be increased at least by 10 dB. Would you be able to obtain the desired SQNR without increasing the transmission bandwidth if it was found that a sampling rate 20% above the Nyquist rate is adequate? If so, explain how. What is the maximum SQNR that can be realized in this way?