Q. Who was the first to solve the problem of ISI?

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Q. According to Nyquist, the impulse response of the overall communication system should have ______ decay with _______ magnitude for sample values not equal to zero.

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Q. Raised cosine filter does not satisfy Nyquist criteria.

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Q. As the roll off factor in raised cosine rolloff filter __________ the occupied bandwidth ________

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Q. Gaussian pulse shaping filter follows Nyquist criterion.

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Q. Gaussian filter has zero crossings at adjacent symbol peaks.

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Q. Which of the following is true for a Gaussian filter?

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Q. Gaussian pulse shaping filter reduces the spectral occupancy and ISI.

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Q. Gaussian pulses are used when cost and power efficiency are major factors.

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Q. In linear modulation technique __________ of transmitted signal varies linearly with modulating digital signal.

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Q. Linear modulation techniques are not bandwidth efficient.

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Q. Which of the following is not a linear modulation technique?

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Q. In BPSK, the ________ of constant amplitude carrier signal is switched between two values according to the two possible values.

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Q. By applying cos(2πft), BPSK signal is equivalent to ________

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Q. BPSK uses non-coherent demodulator.

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Q. DPSK uses coherent form of PSK.

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Q. In DPSK system, input signal is differentially encoded and then modulated using a ________ modulator.

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Q. The energy efficiency of DPSK is _________ to coherent PSK.

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Q. QPSK has ________ the bandwidth efficiency of BPSK.

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Q. QPSK provides twice the bandwidth efficiency and _______ energy efficiency as compared to BPSK.

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