Question 1

Why is pulse shaping technique used?

Accepted Answer

A) to increase isi 
B) to increase spectral width of modulated signal 
C) to reduce isi 
D) to reduce power spectral density 
A) to increase isi 
B) to increase spectral width of modulated signal 
C) to reduce isi 
D) to reduce power spectral density C

Question 2

Raised cosine filter does not satisfy Nyquist criteria.

Accepted Answer

A) True 
 B)False  False

Question 3

M-ary modulation schemes have very good power efficiency.

Accepted Answer

A) True 
 B)False  False

Question 4

What is symbol rate packing?

Accepted Answer

A) maximum possible symbol transmission rate 
B) maximum possible symbol receiving rate 
C) maximum bandwidth 
D) maximum isi value allowed 
A) maximum possible symbol transmission rate 
B) maximum possible symbol receiving rate 
C) maximum bandwidth 
D) maximum isi value allowed

Question 5

A nyquist pulse is the one which can be represented by_________shaped pulse multiplied by another time function.

Accepted Answer

A) sine 
B) cosine 
C) sinc 
D) none of the mentioned 
A) sine 
B) cosine 
C) sinc 
D) none of the mentioned

Question 6

The bandwidth efficiency of an M-ary FSK signal_________      with_________      in M.

Accepted Answer

A) constant, increase 
B) increases, increase 
C) decreases, increase 
D) decreases, decrease 
A) constant, increase 
B) increases, increase 
C) decreases, increase 
D) decreases, decrease

Question 7

In comparison to M-ary PSK, M-ary QAM bandwidth efficiency is_________and power efficiency is_________

Accepted Answer

A) identical, superior 
B) less, superior 
C) identical, identical 
D) superior, superior 
A) identical, superior 
B) less, superior 
C) identical, identical 
D) superior, superior

Question 8

Examples of double side band signals are

Accepted Answer

A) ask 
B) psk 
C) ask & psk 
D) none of the mentioned 
A) ask 
B) psk 
C) ask & psk 
D) none of the mentioned

Question 9

M-ary QAM signal have constant energy per symbol.

Accepted Answer

A) True 
 B)False

Question 10

As the roll off factor in raised cosine rolloff filter_________          the occupied bandwidth

Accepted Answer

A) manchester_________ 
B) faraday 
C) graham bell 
D) nyquist 
A) manchester_________ 
B) faraday 
C) graham bell 
D) nyquist

Question 11

M-ary signalling techniques are not sensitive to timing jitters.

Accepted Answer

A) True 
 B)False

Question 12

In an M-ary signalling scheme two or more bits are grouped together to form a_________

Accepted Answer

A) chip 
B) symbol 
C) byte 
D) pattern 
A) chip 
B) symbol 
C) byte 
D) pattern

Question 13

As the value of M_________        the bandwidth efficiency_________

Accepted Answer

A) increases, same. 
B) increases, decreases 
C) increases, increases 
D) decreases, same 
A) increases, same. 
B) increases, decreases 
C) increases, increases 
D) decreases, same

Question 14

Roll off factor is the fraction of

Accepted Answer

A) excess bandwidth and absolute bandwidth 
B) excess bandwidth and minimum nyquist bandwidth 
C) absolute bandwidth and minimum nyquist bandwidth 
D) none of the mentioned 
A) excess bandwidth and absolute bandwidth 
B) excess bandwidth and minimum nyquist bandwidth 
C) absolute bandwidth and minimum nyquist bandwidth 
D) none of the mentioned

Question 15

A pulse shaping filter should satisfy two requirements. They are

Accepted Answer

A) should be realizable 
B) should have proper roll off factor 
C) should be realizable & have proper roll off factor 
D) none of the mentioned 
A) should be realizable 
B) should have proper roll off factor 
C) should be realizable & have proper roll off factor 
D) none of the mentioned

Question 16

Power efficiency of M-ary FSK increases, since_________

Accepted Answer

A) constellation is densely packed 
B) m signals are non-orthogonal 
C) fixed null bandwidth 
D) m-signals are orthogonal 
A) constellation is densely packed 
B) m signals are non-orthogonal 
C) fixed null bandwidth 
D) m-signals are orthogonal

Question 17

The method in which the tail of one pulse smears into adjacent symbol interval is called as

Accepted Answer

A) intersymbol interference 
B) interbit interference 
C) interchannel interference 
D) none of the mentioned 
A) intersymbol interference 
B) interbit interference 
C) interchannel interference 
D) none of the mentioned

Question 18

What is the radius of the circle in M-ary PSK on which message points are equaly spaced?

Accepted Answer

A) ?es 
B) ?eb 
C) eb 
D) es 
A) ?es 
B) ?eb 
C) eb 
D) es

Question 19

Examples of nyquist filters are

Accepted Answer

A) root raised cosine filter 
B) raised cosine filter 
C) root raised & raised cosine filter 
D) none of the mentioned 
A) root raised cosine filter 
B) raised cosine filter 
C) root raised & raised cosine filter 
D) none of the mentioned

Question 20

Gaussian pulse shaping filter follows Nyquist criterion.

Accepted Answer

A) True 
 B)False

Why is pulse shaping technique used?

Raised cosine filter does not satisfy Nyquist criteria.

M-ary modulation schemes have very good power efficiency.

What is symbol rate packing?

A nyquist pulse is the one which can be represented by_________shaped pulse multiplied by another time function.

The bandwidth efficiency of an M-ary FSK signal_ with_ in M.

In comparison to M-ary PSK, M-ary QAM bandwidth efficiency is_and power efficiency is_

Examples of double side band signals are

M-ary QAM signal have constant energy per symbol.

As the roll off factor in raised cosine rolloff filter_________ the occupied bandwidth

M-ary signalling techniques are not sensitive to timing jitters.

In an M-ary signalling scheme two or more bits are grouped together to form a_________

As the value of M_ the bandwidth efficiency_

Roll off factor is the fraction of

A pulse shaping filter should satisfy two requirements. They are

Power efficiency of M-ary FSK increases, since_________

The method in which the tail of one pulse smears into adjacent symbol interval is called as

What is the radius of the circle in M-ary PSK on which message points are equaly spaced?

Examples of nyquist filters are

Gaussian pulse shaping filter follows Nyquist criterion.

Modulation and Demodulation Techniques

Information Theory and Communication Techniques

Waveform Logic, Pcm Encoding, Vocoder Analysis, and Antenna Radiations

Microwave Communication and Modulation

Signal Filtering and Equalization Techniques

Information Theory and Coding Techniques

Channel Coding and Error Correction Techniques

Algorithms and Techniques for Communication System Security and Error Correction

Modulation Schemes and Access Techniques for Spread Spectrum Systems

Digital and Analog Telecommunications Standards

Filters

Exam 5: M-Ary Signalling and Pulse Shaping Techniques

Why is pulse shaping technique used?

Raised cosine filter does not satisfy Nyquist criteria.

M-ary modulation schemes have very good power efficiency.

What is symbol rate packing?

A nyquist pulse is the one which can be represented by_________shaped pulse multiplied by another time function.

The bandwidth efficiency of an M-ary FSK signal_________ with_________ in M.

In comparison to M-ary PSK, M-ary QAM bandwidth efficiency is_________and power efficiency is_________

Examples of double side band signals are

M-ary QAM signal have constant energy per symbol.

As the roll off factor in raised cosine rolloff filter_________ the occupied bandwidth

M-ary signalling techniques are not sensitive to timing jitters.

In an M-ary signalling scheme two or more bits are grouped together to form a_________

As the value of M_________ the bandwidth efficiency_________

Roll off factor is the fraction of

A pulse shaping filter should satisfy two requirements. They are

Power efficiency of M-ary FSK increases, since_________

The method in which the tail of one pulse smears into adjacent symbol interval is called as

What is the radius of the circle in M-ary PSK on which message points are equaly spaced?

Examples of nyquist filters are

Gaussian pulse shaping filter follows Nyquist criterion.

Modulation and Demodulation Techniques

Information Theory and Communication Techniques

Waveform Logic, Pcm Encoding, Vocoder Analysis, and Antenna Radiations

Microwave Communication and Modulation

Signal Filtering and Equalization Techniques

Information Theory and Coding Techniques

Channel Coding and Error Correction Techniques

Algorithms and Techniques for Communication System Security and Error Correction

Modulation Schemes and Access Techniques for Spread Spectrum Systems

Digital and Analog Telecommunications Standards

Filters

The bandwidth efficiency of an M-ary FSK signal_ with_ in M.

In comparison to M-ary PSK, M-ary QAM bandwidth efficiency is_and power efficiency is_

As the value of M_ the bandwidth efficiency_