Deemed University 2009 A.M.I.E.T.E Electronics

(D) increasing the transmitted power.

g. A (6, 3) linear block code uses a generator matrix provided by . Then the codeword for the message vector will be,

(A) 110110. (B) 010110.
(C) 101110. (D) 100110.

h. An optimal decoding method for minimising the probability of sequence fault is

(A) the (n-k) stage shift register scheme.
(B) the Bahl algorithm.
(C) the maximum a posteriori algorithm.
(D) the viterbi algorithm.

i. The processing gain for frequency hopping systems is described as

(A) the ratio of the data rate to the number of coefficients chosen pseudo randomly.
(B) the ratio of code chip rate to data rate.
(C) the ratio of the data rate to the hopping band.
(D) the ratio of the hopping band to the data rate.

j. In the study of Jamming considerations, the noise power spectral density due to the Jammer is evaluated as

(A) the ratio of thermal noise power to the spread-spectrum bandwidth.
(B) the ratio of received signal power to the spread-spectrum bandwidth.
(C) the ratio of avg. received Jammer power to the spread-spectrum bandwidth.
(D) the ratio of spread-spectrum bandwidth to the avg. received Jammer power.


ans any 5 ques. out of 8 ques..
every ques. carries 16 marks.

Q.2 a. What does sampling process give to the communication engineer? Briefly discuss

(i) natural sampling.
(ii) quantisation noise.
(iii) quantizer saturation. (11)
b. A waveform, is to be uniformly sampled.
(i) What is the maximum allowable time interval ranging from sample values that will ensure perfect signal reproduction?

Earning:   Approval pending.