ANNA UNIVERSITY-TIRUNELVELI
CS36-ANALOG AND DIGITAL COMMUNICATION
PART-A(10 X 2=20)
1.A carrier wave is represented by equation s(t)=12sinwt.draw the wave form of an AM wave for depth of modulation of 0.5.
2.compare FM & AM
3.what is coherent detection?
4.why is binary ASK called on-off keying?
5.what are the errors occurred in DM?
6.Define companding?
7.what are the two methods of error detection and correction?
8.what do you meant by signaling rate?
9.Define processing gain.
10.what is CDMA?
PART-B(5 x 16=80)
11 (a) 1.the output voltage of a transmitter is given by 500(1+0.4sin3140t)cos6.28 x 10^7t.
This voltage is fed to a load of 6000 ohm.determine
1.carrier frequency
2.modulating frequency
3.carrier power (9)
2.explain in detail about the superhydrodyne receiver. (7)
or
(b) 1.a carrier is frequency modulated with a sinusoidal signal signal of 2 khz resulting in a maximum frequency deviation of 5 khz.find
1.modulation index
2.bandwidth of modulating signal. (4)
2.explain the method of generating FM signal using indirect method.(12)
12. (a)1.explain coherent BPSK system.(12)
2.enumerate the advantages & disadvantages of FSK over PSK.(4)
or
(b).1.explain coherent QPSK system.(12)
2.what is DPSK? what is the bandwidth requirement of dpsk?(4)
13. (a)1.explain in detail about the DPCM (10)
2.1 khz signal is sampled by 8 khz sampling signal and the samples are encoded with 12 bit PCM system.find
1.required bandwidth.
2.total no of bits in the digital output signal in 10 cycles.(6)
or
(b)1.write short notes on ISI.(6)
2.what is eye pattern? explain how is performance of a baseband pulse transmission system measured with this?(10)
14. (A).1.write short notes on eror correcting codes.(4)
2.find the generator polynomial of (7,4)cyclic code and find the codeword for the message 1001.(12)
or
(b).1.explain in detail about the serial interface with its control signals and timing information.(16)
15. (a)1.what are pseudo noise sequences?how are they generated?(6)
2.explain direct sequence spread spectrum.
or
(b)explain two types of FH spread spectrum.
KEYWORDS:ANALOG AND DIGITAL COMMUNICATIO,2009 ANNA UNIVERSITY CHENNAI B.E COMPUTER SCIENCE ANALOG AND DIGITAL COMMUNICATION QUESTION PAPER,ANNA UNIVERSITY B.E COMPUTER SCIENCE QUESTION PAPER,ANNA UNIVERSITY,ANNA UNIVERSITY CHENNAI,ANNA UNIVERSITY COIMBATORE,ANNA UNIVERSITY TRICHY,ANNA UNIVERSITY TIRUNELVELI,ANNA UNIVERSITY MADURAI,ANNA UNIVERSITY SYLLABUS,ANNA-UNIVERSITY RESULTS,ANNA UNIVERSITY DISTANCE EDUCATION,ANNA UNIVERSITY MBA-CENTRE FOR DISTANCE EDUCATION,ANNA UNIVERSITY SCHEDULE OF EXAMINATIONS,ANNA UNIVERSITY ADMISSION,ANNA UNIVERSITY COURSES,ANNA UNIVERSITY ACADEMIC,ANNA UNIVERSITY DEPARTMENTS,ANNA UNIVERSITY RESEARCH,ANNA UNIVERSITY MAIL,ANNA UNIVERSITY QUESTION PAPERS,ANNA UNIVERSITY COUNSELLING DATES,ANNA UNIVERSITY RE-EVALUATION RESULTS
CS36-ANALOG AND DIGITAL COMMUNICATION
PART-A(10 X 2=20)
1.A carrier wave is represented by equation s(t)=12sinwt.draw the wave form of an AM wave for depth of modulation of 0.5.
2.compare FM & AM
3.what is coherent detection?
4.why is binary ASK called on-off keying?
5.what are the errors occurred in DM?
6.Define companding?
7.what are the two methods of error detection and correction?
8.what do you meant by signaling rate?
9.Define processing gain.
10.what is CDMA?
PART-B(5 x 16=80)
11 (a) 1.the output voltage of a transmitter is given by 500(1+0.4sin3140t)cos6.28 x 10^7t.
This voltage is fed to a load of 6000 ohm.determine
1.carrier frequency
2.modulating frequency
3.carrier power (9)
2.explain in detail about the superhydrodyne receiver. (7)
or
(b) 1.a carrier is frequency modulated with a sinusoidal signal signal of 2 khz resulting in a maximum frequency deviation of 5 khz.find
1.modulation index
2.bandwidth of modulating signal. (4)
2.explain the method of generating FM signal using indirect method.(12)
12. (a)1.explain coherent BPSK system.(12)
2.enumerate the advantages & disadvantages of FSK over PSK.(4)
or
(b).1.explain coherent QPSK system.(12)
2.what is DPSK? what is the bandwidth requirement of dpsk?(4)
13. (a)1.explain in detail about the DPCM (10)
2.1 khz signal is sampled by 8 khz sampling signal and the samples are encoded with 12 bit PCM system.find
1.required bandwidth.
2.total no of bits in the digital output signal in 10 cycles.(6)
or
(b)1.write short notes on ISI.(6)
2.what is eye pattern? explain how is performance of a baseband pulse transmission system measured with this?(10)
14. (A).1.write short notes on eror correcting codes.(4)
2.find the generator polynomial of (7,4)cyclic code and find the codeword for the message 1001.(12)
or
(b).1.explain in detail about the serial interface with its control signals and timing information.(16)
15. (a)1.what are pseudo noise sequences?how are they generated?(6)
2.explain direct sequence spread spectrum.
or
(b)explain two types of FH spread spectrum.
KEYWORDS:ANALOG AND DIGITAL COMMUNICATIO,2009 ANNA UNIVERSITY CHENNAI B.E COMPUTER SCIENCE ANALOG AND DIGITAL COMMUNICATION QUESTION PAPER,ANNA UNIVERSITY B.E COMPUTER SCIENCE QUESTION PAPER,ANNA UNIVERSITY,ANNA UNIVERSITY CHENNAI,ANNA UNIVERSITY COIMBATORE,ANNA UNIVERSITY TRICHY,ANNA UNIVERSITY TIRUNELVELI,ANNA UNIVERSITY MADURAI,ANNA UNIVERSITY SYLLABUS,ANNA-UNIVERSITY RESULTS,ANNA UNIVERSITY DISTANCE EDUCATION,ANNA UNIVERSITY MBA-CENTRE FOR DISTANCE EDUCATION,ANNA UNIVERSITY SCHEDULE OF EXAMINATIONS,ANNA UNIVERSITY ADMISSION,ANNA UNIVERSITY COURSES,ANNA UNIVERSITY ACADEMIC,ANNA UNIVERSITY DEPARTMENTS,ANNA UNIVERSITY RESEARCH,ANNA UNIVERSITY MAIL,ANNA UNIVERSITY QUESTION PAPERS,ANNA UNIVERSITY COUNSELLING DATES,ANNA UNIVERSITY RE-EVALUATION RESULTS