Q. Which modulation scheme is also called as on-off keying method?

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Q. In amplitude phase keying each phase vector is separated by

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Q. The transformation of the waveform into a single point in signal space is called as

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Q. The correlating detector is also known as

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Q. The minimum nyquist sampling rate is given as, fs =

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Q. Phase-locked loop circuitry is used for

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Q. In differential PSK the date is

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Q. Envelope detector consists of

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Q. The minimum required spacing is the difference between the

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Q. The minimum tone separation corresponds to

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Q. Matched filter is used for

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Q. In differential encoding the _________ different between two wave forms is measured.

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Q. The error probability of DPSK is ________ worse than PSK.

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Q. The limit which represents the threshold Eb/N0 value below which reliable communication cannot be maintained is called as

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Q. M-ary signalling produces _______ error performance with orthogonal signalling and _______ error performance with multiple phase signalling.

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Q. Which is more vulnerable to noise?

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Q. In which system, bit stream is portioned into even and odd stream?

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Q. The error performance of MPSK ______ as M or k increases.

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Q. In MPSK adding new signals _______ make it vulnerable to noise and in MFSK _______ make it vulnerable.

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Q. In orthogonal signalling with symbols containing more number of bits we need ____ power.

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