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Code No: 07A5EC09 :2: Set No.4
10) Exchange between channel bandwidth and (S/N) ratio can be adjusted based on [ ]
a)Shannon’s limit b)Shannon’s source coding
c) Shannon’s channel coding d) Shannon Hartley theorem
II Fill in the blanks:
11) The minimum distance of a linear block code is equal to____________________of any
non-zero code word in the code.
12) A linear block code with a minimum distance d min
can detect upto ___________________
13) For a Linear Block code Code rate =_________________
14) The information rate of a source is also referred to as entropy measured in
______________
15) H(X,Y)=______________ or __________________
16) Capacity of a noise free channel is _________________
17) The Shannon’s limit is ______________
18) The channel capacity with infinite bandwidth is not because ____________
19) Assuming 26 characters are equally likely , the average of the information content of
English language in bits/character is________________
20) The distance between two vector c1 and c2 is defined as the no.of components in which
they are differ is called as____________________
-oOo-
20. Tutorial Questions
1. (a) Explain the basic principles of sampling, and distinguish between ideal sampling and practical
sampling.
(b) A band pass signal has a centre frequency fo and extends from fo - 5 KHz to f0 + 5 KHz. It is
sampled at a rate of fs = 25 KHz. As f o varies from 5 KHz to 50 KHz, find the ranges of fo for which
the sampling rate is adequate.
2. a) Describe the synchronization procedure for PAM,PWM and PPM signals. Also discuss about
the spectra of PWM and PDM signals.
b) State and prove sampling theorem.
3. (a) Explain the method of generation and detection of PPM signals with neat sketches.
(b) Compare the characteristics of PWM and PPM signals.
(c) Which analog pulse modulation can be termed as analogous to linear CW modulation and
why?
4. List out the applications, merits and demerits of PAM, PPM and PWM signals.
5. What are the advantages and disadvantages of digital communication system?
6. Draw and explain the elements of digital communication system?