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

Tuesday, 30 April 2013 03:15Web

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**(**increasing the transmitted power.

**D)**g. A (6,

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

**(**1101

**A)****10.**

**(**010110.

**B)****(**1011

**C)****10.**

**(**100110.

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

**(**the (n-k) stage shift register schem

**A)****e.**

**(**the Bahl algorithm.

**B)****(**the maximum a posteriori algorithm.

**C)****(**the viterbi algorithm.

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

**(**the ratio of the data rate to the number of coefficients chosen pseudo randomly.

**A)****(**the ratio of code chip rate to data rate.

**B)****(**the ratio of the data rate to the hopping ban

**C)****d.**

**(**the ratio of the hopping band to the data rate.

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

**(**the ratio of thermal noise power to the spread-spectrum bandwidth.

**A)****(**the ratio of received signal power to the spread-spectrum bandwidth.

**B)****(**the ratio of avg. received Jammer power to the spread-spectrum bandwidth.

**C)****(**the ratio of spread-spectrum bandwidth to the avg. received Jammer power.

**D)**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

**(**natural sampling.

**i)****(**quantisation noise.

**i****i)****(**quantizer saturation. (11)

**i****i****i)****b.**A waveform, is to be uniformly sampled.

**(**What is the maximum allowable time interval ranging from sample values that will ensure perfect signal reproduction?

**i)**Earning: Approval pending. |