Modulation & Equalization Techniques for Mobile Radio -1 - MCQs with answers

Modulation & Equalization Techniques for Mobile Radio - 1 - MCQs with answers

Spread Spectrum Modulation Techniques

Q1. Spread spectrum modulation involves

1. PN sequence for modulation
2. Large bandwidth
3. Multiple users

a. 1) and 2) are correct
b. 1) and 3) are correct
c. 2) and 3) are correct
d. All the three are correct

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Q2. PN sequence at the decoder acts as a locally generated carrier at the receiver and decodes the signal using

a. Correlator
b. Adder
c. Frequency divider
d. PLL

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Q3. In spread spectrum technique, the multiple users are assigned

a. Same spectrum and same PN code
b. Same spectrum and different PN code
c. Different spectrum and different PN code
d. Different spectrum and same PN code

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Q4. Advantage of using Spread Spectrum modulation is/are

1. Interference rejection capability
2. Frequency planning is not required
3. Resistance to multipath fading
4. ISI is lesser

a. 1) and 2) are correct
b. 1), 2) and 3) are correct
c. 2) and 3) are correct
d. All the four are correct

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Q5. Direct sequence spread spectrum demodulation uses

a. DPSK
b. FSK
c. ASK
d. QPSK

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Q6. Fast hopping is

a. More than one frequency hop during each symbol
b. Hopping rate greater than or equal to information symbol rate
c. One or more symbols transmitted between frequency hops
d. Both a) and b)
e. Both b) and c)

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Q7. Slow frequency hopping refers to

a. One or more symbols transmitted in time interval between frequency hops
b. More than one frequency hop during each symbol
c. Hopping rate greater than or equal to information symbol rate
d. Both a) and c) are correct

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