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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