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Quiz 1
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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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