Tuesday 24 December 2013

Comprehensive Viva Questions On Digital Communication

Comprehensive Viva Questions On Digital Communication

1.       The first communication was Telegraphy a digital system
2.      The input transducer converts  Myriad signal in to Analog Electric Signals
3.      Communication channel is the physical medium between transmitter and receiver0
4.      Absolute band width is the interval between frequencies
5.      The simplest mathematical method for a communication channel is the Additive Noise Channel
6.      Rician Distribution is used in the envelope detection of digitally modulated signals
7.      The implementation of a sampler is most commonly done with the help of Sample and Hold circuit
8.     The processing pair Compression and Expansion is collectively referred as Compading
9.      Noise with uniform spectral density is called White Noise
10.  There is an algorithm known as Levinson-Durbin Algorithm by which the co-efficient can be solved recursively
11.   The Huffman code can be applied to M-Ray source
12.  Cyclic Redundancy Check Codes are good at detecting burst of errors
13.  Viterbi Algorithm is an optimal decoder in the class of maximum likelihood detectors
14.  Ideally a QPSK signal has a constant amplitude
15.  The estimation of carrier phase and frequency  is called Carrier Recovery





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