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Quiz 2
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Q.1
US AMPS,channels are allocated to various operators withkHz guard band and channel between them iskHz. What is the spectrum allocation given to each operator?
12.5 khz
30 khz
12.5 mhz
30 mhz
Q.2
Based on FDMA/FDD.
gsm
w-cdma
cordless telephone
amps
Q.3
Undesired RF radiation.
intermodulation frequency
intermediate frequency
instantaneous frequency
instrumental frequency
Q.4
Of the following is not true for FDMA systems as compared to TDMA systems?
low complexity
lower cell site system cost
tight rf filtering
narrow bandwidth
Q.5
Bandwidth of FDMA channel is
wide
narrow
large
zero
Q.6
The FDMA channel is not in use, it can be used by other users.
true
false
Q.7
Division multiple access (FDMA) assigns channels to users.
individual, individual
many, individual
individual, many
many, many
Q.8
Duration is shorter?
hop duration
symbol duration
chip duration
none of the mentioned
Q.9
Frequency hopping is
several hops per modulation
several modulations per hop
several symbols per modulation
none of the mentioned
Q.10
Are the
repeated symbols
non repeated symbols
smallest length symbols
none of the mentioned
Q.11
Gives the inability of a signal to withstand the impairments.
true
false
Q.12
Type of demodulator is used in the frequency hopping technique?
coherent
non coherent
coherent & non coherent
none of the mentioned
Q.13
Which technique is phase coherence hard to maintain?
direct sequence
frequency hopping
direct sequence & frequency hopping
none of the mentioned
Q.14
System allows larger processing gain?
direct sequence
frequency hopping
direct sequence & frequency hopping
none of the mentioned
Q.15
Minimum spacing between consecutive hop positions gives the
minimum number of chips necessary
maximum number of chips necessary
chip rate
none of the mentioned
Q.16
Processing gain is given as modulation scheme.
wss/r
r/wss
wss/2r
r/2wss
Q.17
Modulation scheme is preferred for direct sequence spread spectrum process?
bpsk
qpsk
bpsk & qpsk
none of the mentioned
Q.18
Gain is given as
wss/r
rch/r
wss/r & rch/r
none of the mentioned
Q.19
Is defined as
shortest uninterrupted waveform
largest uninterrupted waveform
shortest diversion
none of the mentioned
Q.20
Direct sequence process which step is performed first?
de-spreading
demodulation
despreading & demodulation
none of the mentioned
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