11. A coherent binary phase-shift keyed (BPSK) transmitter operates at a bit rate of 20 Mbps. For a probability of error (Pe) of 10-4 and given carrier-to-noise $$\left( {\frac{{\text{C}}}{{\text{N}}}} \right)$$ density ratio of 8.8 dB, determine energy of bit-to-noise $$\left( {\frac{{{{\text{E}}_{\text{b}}}}}{{{{\text{N}}_0}}}} \right)$$ density ratio for a receiver bandwidth equal to the minimum double-sided Nyquist bandwidth.
12. In . . . . . . . . the position of a pulse relative to its unmodulated time of occurrence is varied in accordance with the message signal.
13. An analog signal has significant spectral components from 1 kHz to 5 kHz. What is the Nyquist sampling rate of this signal?
14. In PCM if the transmission path is very long
15. Which of the following modulation schemes gives the maximum probability of error?
16. In QPSK the average probability of bit error in AWGN channel is obtained as
17. A signal x(t) = 100cos(24π × 103)t is ideally sampled with a sampling period of 50 µsec and then passed through an ideal lowpass filter with cutoff frequency of 15 kHz. Which of the following frequencies is/are present at the filter output?
18. In a M-ary PSK digital communication system, it is required to transmit the data with 80 Mbps bit rate within maximum allowable channel bandwidth of 16 MHz. The value of M is
19. To overcome slope overload problem which type of integrator is used in delta modulation?
20. A comparison of frequency division and time division multiplexing system shows that
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