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# Tutorial5 - Q4 Find BER for a BPSK with carrier signal 10-2...

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EE 3008. Band-Pass DM Tutorial Questions Q1) Population census in a certain district shows that the grow- up men’s and women’s heights are Gaussian distributed, respectively. The average height of men is 1.7m, and that of women is 1.6m. The variance in both cases is 0.0144m 2 . (Note: These data are purely made up. Do not use these data to make fun of each other.) (a) Find the proportion of grow-up men higher than 2.3m; (b) Find the proportion of grow-up women lower than 1m; (c) Find the proportion of grow-up humans between 1.6m and 1.7m. Q2) Describe a detection system using an envelope detector. Q3) Let the input be a data stream of 10 kbps and carrier be 1MHz. Sketch the power spectrum for (a) BPSK modulation; and (b) On-off ASK modulation;
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Unformatted text preview: Q4) Find BER for a BPSK with carrier signal 10-2 cos(2 π 10 9 t)V and data rate 10 kbps. The channel is AWGN with N =2 × 10-9 . What is the BER if the transmission power is reduced by half? Q5) An 4-ary ASK whose carrier is Acos(2 π 10 9 t)V, with A= –3, –1, 1 and 3. Data rate is 20 kbps. The channel is AWGN with N =2 × 10-5 . Assume 1 Ω loading resistance. (a) What is the output levels for the 4 symbols if the reference signal is cos(2 π 10 9 t)V ? (b) What is average energy per symbol and per bit? (c) What is the symbol error rate? (d) Express the symbol error rate in terms of average bit energy and noise spectral density N ....
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