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41. Which of the following is not a category of space diversity technique?
a. Selection diversity
b. Time diversity
c. Feedback diversity
d. Equal gain diversity
Discuss
Answer: (b).Time diversity

42. In selection diversity, the gain of each diversity branch provides different SNR.
a. True
b. False
c. May be True or False
d. Can't say
Discuss
Answer: (b).False

43. Polarization diversity uses the ________ as the diversity element.
a. Modulation index
b. Carrier frequency
c. Reflection coefficient
d. Coherence time
Discuss
Answer: (c).Reflection coefficient

44. Which of the factor does not determine the correlation coefficient?
a. Polarization angle
b. Cross polarization discrimination
c. Offset angle from the main beam direction
d. Coherence time
Discuss
Answer: (d).Coherence time

45. Frequency diversity is implemented by transmitting information on more than one ___________
a. Carrier frequency
b. Amplitude
c. Phase
d. Modulation scheme
Discuss
Answer: (a).Carrier frequency

46. Frequency diversity uses ________ as a diversity element.
a. Correlation coefficient
b. Coherence time
c. Coherence bandwidth
d. SNR
Discuss
Answer: (c).Coherence bandwidth

47. Frequency diversity is good for low traffic conditions.
a. True
b. False
c. May be True or False
d. Can't say
Discuss
Answer: (b).False

48. Time diversity repeatedly transmits information at time spacings that exceed ___________
a. Coherence bandwidth
b. Dwell time
c. Run time
d. Coherence time
Discuss
Answer: (d).Coherence time

49. In maximal ratio combining, the output SNR is equal to __________
a. Mean of all individual SNRs
b. Maximum of all SNRs
c. Sum of individual SNR
d. Minimum of all SNRs
Discuss
Answer: (c).Sum of individual SNR

50. In CDMA spread spectrum systems, chip rate is less than the bandwidth of the channel.
a. True
b. False
c. May be True or False
d. Can't say
Discuss
Answer: (b).False

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