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Communication Systems

Q1: A signal is sampled at 8 kHz and is quantized using 8 bit uniform quantizer. Assuming SNRq for a sinusoidal signal, the correct statement for PCM signal with a bit rate of R is

A R = 32 KbPs, SNRq = 25.8 dB

B R = 64 KbPs, SNRq = 49.8 dB

C R = 64 KbPs, SNRq = 58.8 dB

D R = 32 KbPs, SNRq = 49.8 dB

ANS:B - R = 64 KbPs, SNRq = 49.8 dB

where n is no. of bit, fs is sampling frequency. SNR = 1.76 + 6.02n = 1.76 + 6.02 x 8 49.8 dB.



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