Unformatted text preview: Q4) Find BER for a BPSK with carrier signal 102 cos(2 π 10 9 t)V and data rate 10 kbps. The channel is AWGN with N =2 × 109 . What is the BER if the transmission power is reduced by half? Q5) An 4ary 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 × 105 . 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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 Fall '08
 PingLi
 1m, spectrum, 1.6M, 1.7m

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