## Digital Communication Interview Questions & Answers

• Question 1. Explain How Qpsk Differs From Psk In Term Of Transmission Bandwidth And Bit Information It Carries?

For a given bit rate 1/Tb, a QPSK wave requires half the transmission bandwidth of the corresponding binary PSK wave. Equivalently for a given transmission bandwidth, a QPSK wave carries twice as many bits of information as the corresponding binary PSK wave

• Question 2. Give The Equation For Average Probability Of Symbol Error For Coherent Binary Psk?

Average probability of signal error,

Pe = 1 / 2 erfc? Eb / No

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• Question 3. Define Qpsk?

QPSK is Quadriphase –shift keying. In QPSK the phase of the carrier takes on one of the four equally spaced values Such as ?/4 , 3?/4, 5?/4 and 7?/4.

• Question 4. Define Dibit?

dibits 10, 00, 01 & 11

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• Question 5. Give The Two Basic Operation Of Dpsk Transmitter?

1. differential encoding of the input binary wave
2. Phase –shift keying hence, the name differential phase shift keying
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• Question 6. Define Information Capacity?

Information capacity represents the number of independent symbols that can be carried in the system for a given time.

• Question 7. What Is The Unit Of Information Capacity?

Unit is bits per second

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• Question 8. Why Digital Amplitude Modulation Is Commonly Called On –off Keying?

Carrier is either in ON or Off state so it is called as On Off Keying.

• Question 9. Why Digital Amplitude Modulation Is Called As Continuous Wave Modulation?

When the carrier is being transmitted it has constant amplitude, constant frequency and constant phase.

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• Question 10. Define Bit Rate?

The rate of change at the input to the modulation is called bit ra and is expressed in bits per second.

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• Question 11. Define Baud?

Baud is the rate of change and is equal to the reciprocal of one signaling element.

• Question 12. Define Phase Reversal Keying?

Since Phase of the output carrier shifts between two phases PSK is also called as Phase reversal keying.

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• Question 13. What Is Offset Qpsk?

IT is a modified form of QPSK where the bit waveforms on the I and Q channels are offset or phase shifted in phase from each other one by one half of a bit time.

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• Question 14. What Is Eight Phase Psk?

Eight Phase PSK (8-PSK) is an M-ary encoding technique where M=8.

• Question 15. What Is The Need Of Maximum Distance Code?

It is used to reduce the number of transmission errors.

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• Question 16. What Is Quad Bits?

A 16 bit PSK modulator acts on the incoming data in groups of four bit is called Quad bits.

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• Question 17. Define Dpsk?