# Tutorial 7 - ELEG4503 Modern Communication System...

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ELEG4503 Modern Communication System Self-Practice: Tutorial 7 October 20, 2016 1 Line Codes (20%) (a) What is the logic bit stream for the following bipolar NRZ-L code diagram? (5%) 1 +A -A 3×10 -3 sec (b) If the bit error probability of detection is not larger than 3 . 167 × 10 - 5 , the power spectral density η is 2 × 10 - 4 W/Hz and the bit duration time is the same as the above bipolar NRZ-L code, what’s the minimum received signal power? (15%) You may need Q (3) = 1 . 300 × 10 - 3 Q (4) = 3 . 167 × 10 - 5 Q (5) = 2 . 867 × 10 - 7 Q (6) = 9 . 866 × 10 - 10 Q (7) = 1 . 280 × 10 - 12 2 PCM (20%) Consider a 6-bit PCM system. Let the input signal be limited in A sin(t) V. (a) What’s the quantization step (5%)? 1

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(b) What’s the signal-to-quantization-noise ratio (SNR)? (5%) (c) If the input value is 0.3126V and A = 5, what’s the quantization error? (10%) 3 Binary Modulation (20%) Suppose we have a ASK signal f 1 ( t ) = ( A 1 sin w 0 t, for “1” , 0 , for “0” . (1) with t [0 , T ]. (a) If the bit rate is R b = 4 . 8 × 10 6 bps, A 1 = 1mv, Gaussian noise power spectral density is η = 2 × 10 - 15 W/Hz, what’s the minimum bit error rate
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