Wireless and Mobile Communications Multiple choice Questions and Answers-Equalization,Diversity and Channel Coding

51.	A RAKE receiver collects the __________ versions of the original signal.
a.	Time shifted
b.	Amplitude shifted
c.	Frequency shifted
d.	Phase shifted

Discuss

Answer: (a).Time shifted

52.	RAKE receiver uses separate _________ to provide the time shifted version of the signal.
a.	IF receiver
b.	Equalizer
c.	Correlation receiver
d.	Channel

Discuss

Answer: (c).Correlation receiver

53.	Each correlation receiver in RAKE receiver is adjusted in ____________
a.	Frequency shift
b.	Amplitude change
c.	Phase shift
d.	Time delay

Discuss

Answer: (d).Time delay

54.	The range of time delays that a particular correlator can search is called ________
a.	Search window
b.	Sliding window
c.	Time span
d.	Dwell time

Discuss

Answer: (a).Search window

55.	RAKE receiver is used for _______ technique.
a.	CDMA
b.	TDMA
c.	FDMA
d.	OFDM

Discuss

Answer: (a).CDMA

56.	A RAKE receiver uses __________ to separately detect the M strongest signals.
a.	Single correlator
b.	Multiple correlator
c.	Single IF receiver
d.	Multiple IF receivers

Discuss

Answer: (b).Multiple correlator

57.	In a RAKE receiver, if the output from one correlator is corrupted by fading, all the other correlator’s output are also corrupted.
a.	True
b.	False
c.	May be True or False
d.	Can't say

Discuss

Answer: (b).False

Discuss

Answer: (c).Diversity

59.	Interleaving is used to obtain ___________ diversity.
a.	Time
b.	Frequency
c.	Polarization
d.	Antenna

Discuss

Answer: (a).Time

60.	In block codes, parity bits are ___________ to block of messages.
a.	Added
b.	Subtracted
c.	Multiplied
d.	Divided

Discuss

Answer: (a).Added