Q.1
Zero forced equalizers are used for
  • reducing isi to zero
  • sampling
  • quantization
  • none of the abov
Q.2
The autocorrelation function is maximum at
  • origin
  • infinity
  • origin & infinity
  • none of the mentioned
Q.3
Which needs more signal power?
  • BPSK
  • 16-QAM
  • BPSK & 16-QAM
  • None of these
Q.4
Which of the following technique used in CDMA
  • qam
  • gmsk
  • ds-ss bpsk
  • fh-ss fsk
Q.5
US digital cellular system based on CDMA was standardized as
  • is-54
  • is-136
  • is-95
  • is-76
Q.6
Which is easier to implement and is preferred?
  • coherent system
  • non coherent system
  • coherent & non coherent system
  • none of the mentioned
Q.7
The non coherent FSK needs Eb/N0 than coherent FSK.
  • 1db more
  • 1db less
  • 3db more
  • 3db less
Q.8
The DPSK needs Eb/N0 than BPSK.
  • 1db more
  • 1db less
  • 3db more
  • 3db less
Q.9
Which is the main system consideration?
  • probability of error
  • system complexity
  • random fading channel
  • all of the mentioned
Q.10
In the frequency of the carrier signal is varied based on the information in an a digital signal
  • ask
  • psk
  • fsk
  • qam
Q.11
In the amplitude of the carrier signal is varied based on the information in an a digital signal
  • ask
  • psk
  • fsk
  • qam
Q.12
In modulation , the bit rate is 8 times the baud rate
  • 8-qam
  • 64-qam
  • 256-qam
  • none of above
Q.13
In modulation , the baud rate is 1/4 times the bit rate
  • 4-qam
  • 2-psk
  • 4-psk
  • none of above
Q.14
Which of the following is not a characteristic of PN sequence?
  • balance property
  • autocorrelation property
  • run property
  • non deterministic
Q.15
symbols.
  • 2m
  • m
  • 2m
  • 2m-1
Q.16
PN sequence can be generated using .
  • sequential logic circuits
  • op-amp
  • timer ic
  • mosfet
Q.17
DSSS system spreads the baseband signal by the baseband pulses with a pseudo noise sequence.
  • adding
  • subtracting
  • multiplying
  • dividing
Q.18
The bandwidth of the channel used in the hopset is called
  • hopping bandwidth
  • total hopping bandwidth
  • instantaneous bandwidth
  • 3 db bandwidth
Q.19
A TDMA system usesMHz for the forward link, which is broken into radio channels ofkHz. If 8 speech channels are supported on a single radio channel, how many simultaneous users can be accommodated?
  • 25
  • 200
  • 1600
  • 1000
Q.20
of TDMA system is a measure of the percentage of transmitted data that contains information as opposed to providing overhead for the access scheme.
  • efficiency
  • figure of merit
  • signal to noise ratio
  • mean
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