DIGITAL MODULATION ASK FSK PSK CODE

In such situations it is essential to convert digital data to analog signal.īasic approach is shown in Figure below.

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DIGITAL MODULATION ASK FSK PSK CODE

A line code which has zero dc element for pulse transmission of random Binary data isĪnswer – (3) 28. pulse for remaining half of the symbol and for ‘0’ the order is inverted is identified asĪnswer – (4) 27. pulse for a half of symbol duration, a -ve. A scheme in that ‘1’ is representing by a +ve. Eye pattern is used to studyĪnswer – (1) 26. Alternate Mark Inversion (AMI) signaling is acknowledged asĪnswer – (b) 25. To encoding in binary, the Differential encoding utilized forĪnswer – (3) 24. AMI is another name of which process?Īnswer – (2) 23. Transversal equalizer uses tapped delay line toĪnswer – (1) 22. In Eye Pattern, as eye closes:Īnswer – (1) 21. The Nyquist interval for m(t) = isĪnswer – (c) 20. Eye-pattern is utilized for the study ofĪnswer – (d) 19.

Decrease the error probability of signal detectionĪnswer – (2) 18.

Equalize the distortion introduced by channel.

Increase the signal to noise ratio at the receiver.

Whose bandwidth is maximum?Īnswer – (3) 16. Which gives maximum probability of error?Īnswer – (1) 15. Which of the following digital modulation techniques are employed in telephone modem?Īnswer – (4) 14. Which of the following gives the least probability of error?Īnswer – (3) 13. The width of the power spectral density main love given the bandwidths of MSK signal and is given by …… times the baseband frequency (f b)Īnswer – (2) 12. For a BPSK system, the bit error probability is given by,Īnswer – (3) 11. If the baud rate is 400 for a QPSK signal, the rate isĪnswer – (3) 10. These waveforms will be Orthogonal for bit interval ofĪnswer – (2) 9. In a system using in FSK, the ‘0’ and ‘1’ bit are represented by sine waves of 10 and 25 KHz correspondingly. BPSK signal can be demodulated by using,Īnswer – (1) 8. The modulation techniques employed in for telephone modems is ?Īnswer – (1) 7. If the maximum instantaneous phase transition of a digital modulation techniques kept at 90°, the modulation will be organized asĪnswer – (2) 6. The bit rate of a digital communication system using QPSK modulation techniques in 30 MBPS. In Coherent demodulation technique of FSK signal can be affected usingĪnswer – (1) 4.

The Baud rate will be in QPSK modulation techniquesĪnswer – (2) 3. The bit rate of digital communication system is 34 M bits/sec. For generation of FSK the data pattern will beĪnswer – (2) 2. Topics of discussion : Digital Modulation Techniques 1.

Digital modulation ask fsk psk