Q101
Open questionEqualization in digital communication
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ECE · all questionsDigital Communication
Digital Communication
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Q102
Open questionWhich is the most important subsystem for recovering and reconstructing signals in a TDM system?
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Q103
Open questionFor any 4-ary FSK, the signal set is given by
The dimension of its signal space is
The dimension of its signal space is
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Q104
Open questionIn flat-top sampling, a hold circuit is sometimes required. This hold circuit can be designed as a sampler followed by
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Q105
Open questionWhat is the sampling rate of a signal when it is sampled at every 0.001 sec?
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Q106
Open question500 Bytes of data needs to be transmitted from an UART every 100 ms. What should be the minimum transmission baud rate of UART, assuming 1 start bit, 8 data bits and 2 stop bits?
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Q107
Open questionIn PCM, the biggest disadvantage as compared to AM is
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Q108
Open questionThe spectral range of a band pass signal extends from 10 MHz to 10.4 MHz. What is the minimum sampling frequency required for reconstruction?
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Q109
Open questionWhich of the following pulse modulation is analog?
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Q110
Open questionIn which one of the following techniques, RF binary signals are transmitted as given?
0 : p'(t)cos[ωC - (∆ω/2)]t
1 : p'(t)cos[ωC + (∆ω/2)]t
0 : p'(t)cos[ωC - (∆ω/2)]t
1 : p'(t)cos[ωC + (∆ω/2)]t
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Q111
Open questionA 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 density ratio of 8.8 dB, determine energy of bit-to-noise density ratio for a receiver bandwidth equal to the minimum double-sided Nyquist bandwidth.
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Q112
Open questionIn . . . . . . . . the position of a pulse relative to its unmodulated time of occurrence is varied in accordance with the message signal.
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Q113
Open questionAn analog signal has significant spectral components from 1 kHz to 5 kHz. What is the Nyquist sampling rate of this signal?
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Q114
Open questionIn PCM if the transmission path is very long
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Q115
Open questionWhich of the following modulation schemes gives the maximum probability of error?
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Q116
Open questionIn QPSK the average probability of bit error in AWGN channel is obtained as
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Q117
Open questionA 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?
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Q118
Open questionIn 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
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Q119
Open questionTo overcome slope overload problem which type of integrator is used in delta modulation?
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Q120
Open questionA comparison of frequency division and time division multiplexing system shows that
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