1) Probability of outage refers to
a. Noise developed at the receiver
b. Number of bit errors during transmission
c. Signal to noise ratio
d. All of the above
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2) The digital modulation technique used in frequency selective channels is
a. FSK
b. ASK
c. BPSK
d. QPSK
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3) Working of Adaptive Equalizers include
a. Training
b. Tracking
c. Modulation
d. Both a and b
e. All a, b and c are correct
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4) The time span for which the equalizer converges depends upon
1. Equalizer algorithm
2. Equalizer structure
3. Rate of change of multipath radio channel
4. Amplitude of signal
a. 1 and 2 are correct
b. 1, 2 and 3 are correct
c. 2 and 3 are correct
d. All the four are correct
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5) The Linear Equalizer may be implemented as
a. FIR filter
b. Lattice filter
c. Low pass filter
d. Both a and b
e. Both a and c
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6) Linear equalizer is also known as
a. Transversal filter
b. Lattice filter
c. Low pass filter
d. None of the above
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7) The methods used for non linear equalization are
a. Decision Feedback Equalization
b. Maximum Likelihood Symbol Detection
c. Maximum Likelihood Sequence Estimation
a. 1 and 2 are correct
b. 1, 2 and 3 are correct
c. 2 and 3 are correct
d. None of the above
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8) The performance of algorithms for Adaptive Equalization are given by
1. Rate of convergence
2. Computational complexity
3. Numerical properties
4. Frequency change
a. 1 and 2 are correct
b. 1, 2 and 3 are correct
c. 2 and 3 are correct
d. All are correct
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9) Computational complexity of an algorithm refers to the
a. Number of operations for one iteration of algorithm
b. Inaccuracies in the mathematical analysis
c. Noise produced during one complete iteration of algorithm
d. All of the above
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Answer
Explanation
Related Ques
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ANSWER: Number of operations for one iteration of algorithm
Explanation:
No explanation is available for this question!
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10) The algorithms acquired for adaptive equalization are
1. Zero forcing algorithm
2. Least mean squares algorithm
3. Recursive least squares algorithm
a. 1 and 2 are correct
b. 1, 2 and 3 are correct
c. 2 and 3 are correct
d. None of the above
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11) Fractionally spaced equalizer acts as
a. Matched filter
b. Equalizer
c. Demodulator
d. Both a and b
e. All a, b and c are correct
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12) Diversity employs the decision making at
a. Transmitter
b. Receiver
c. Transmitter and receiver
d. Communication channel
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13) The diversity schemes are based on
1. Time diversity
2. Frequency diversity
3. Space diversity
4. Polarization diversity
a. 1 and 2 are correct
b. 1, 2 and 3 are correct
c. 2 and 3 are correct
d. All the four are correct
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14) In time diversity
a. Multiple versions of signals are transmitted at different time instants
b. The signal is transmitted using multiple channels
c. Signal is transmitted with different polarization
d. All of the above
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Answer
Explanation
Related Ques
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ANSWER: Multiple versions of signals are transmitted at different time instants
Explanation:
No explanation is available for this question!
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15) RAKE receiver is
1. Several sub receivers
2. Several correlators
3. Fingers
4. Equalization based
a. 1 and 2 are correct
b. 1, 2 and 3 are correct
c. 2 and 3 are correct
d. All the four are correct
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16) The RAKE receiver involves the steps
a. Correlator, estimation of transmitted signal, demodulation, bit decision
b. Estimation of transmitted signal, correlator, demodulation, bit decision
c. Estimation of transmitted signal, demodulation, correlator, bit decision
d. Estimation of transmitted signal, demodulation, bit decision, correlator
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Answer
Explanation
Related Ques
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ANSWER: Correlator, estimation of transmitted signal, demodulation, bit decision
Explanation:
No explanation is available for this question!
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17) Search window of a RAKE receiver is
a. Frequency band of the channel
b. Range of the time delays
c. Range of noise
d. All of the above
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18) Speech Coders are categorized on the basis of
a. Signal compression techniques
b. Frequency of signal
c. Bandwidth of the signal
d. All of the above
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19) Waveform coders and Vocoders are the types of
a. Speech coders
b. Modulation technique
c. Frequency translation methods
d. Channel allocation for transmission
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20) PCM, DPCM, DM, ADPCM are the types of
a. Vocoders
b. Waveform coders
c. Channel allocation for transmission
d. All of the above
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21) Speech coding technique that is independent of the source is
a. Vocoders
b. Waveform coders
c. Both a & b
d. None of the above
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22) Advantage of using waveform coders is
1. Independent of the signal source
2. Less complexity
3. Suitable for noisy environments
a. 1 and 2 are correct
b. 1 and 3 are correct
c. 2 and 3 are correct
d. All the three are correct
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23) The type of frequency domain coding that divides the speech signal into sub bands is
a. Waveform coding
b. Vocoders
c. Block transform coding
d. Sub-band coding
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24) The speech coding technique that is dependent on the prior knowledge of the signal is
a. Waveform coders
b. Vocoders
c. Sub band coding
d. Block transform coding
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25) The steps involved in Channel vocoders for speech transmission are
a. Envelope detection, sampling, encoding, multiplexing
b. Sampling, Envelope detection, encoding, multiplexing
c. Envelope detection, encoding, sampling, multiplexing
d. Sampling, Envelope detection, multiplexing, encoding
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Answer
Explanation
Related Ques
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ANSWER: Envelope detection, sampling, encoding, multiplexing
Explanation:
No explanation is available for this question!
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26) Vocal tract cepstral coefficients and excitation coefficients are separated by
a. Samplers
b. Linear filters
c. Encoders
d. Multiplexers
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27) In voice excited vocoders, PCM transmission helps in transmission of
a. High frequency bands of speech
b. Low frequency bands of speech
c. Multiplexed signals
d. Modulated signals
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28) Linear predictive coders are based on the principle that
1. Current signal sample is obtained from linear combination of past samples
2. Current signal sample is independent of past samples
3. These are time domain vocoders
4. They are among low bit rate vocoders
a. 1, 3 and 4 are correct
b. 2, 3 and 4 are correct
c. 1 and 4 are correct
d. All the four are correct
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29) Multi pulse excited LPC includes
1. Multiple pulses per period
2. Minimization of weighted mean square error
3. Better speech quality
4. Pitch detection is not required
a. 1 and 4 are correct
b. 1 and 3 are correct
c. 2 and 4 are correct
d. All four are correct
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30) In residual excited LPC,
a. The residue of subtraction of generated and original signal is quantized at the transmitter
b. Pitch detection is not required
c. Multiple pulses per period
d. Coder and decoders have predetermined set of codes
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Answer
Explanation
Related Ques
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ANSWER: The residue of subtraction of generated and original signal is quantized at the transmitter
Explanation:
No explanation is available for this question!
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31) The speech sequence in GSM Codec consists of
a. Pre emphasis, segmentation, windowing, filtering
b. Windowing, Pre emphasis, segmentation, filtering
c. Pre emphasis, windowing, segmentation, filtering
d. Pre emphasis, segmentation, filtering, windowing
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Answer
Explanation
Related Ques
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ANSWER: Pre emphasis, segmentation, windowing, filtering
Explanation:
No explanation is available for this question!
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32) The windowing technique used for speech coding in GSM Codec is
a. Blackman window
b. Welch window
c. Cosine window
d. Hamming window
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33) The received signal at the GSM speech decoder is passed through
a. STP filter
b. LTP filter
c. Quantizer
d. PLL
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34) In GSM Codec, the bits encoded for forward error correction are
a. Ia bits
b. Ib bits
c. II bits
d. Both a and b
e. Both a and c
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35) The speech coders are selected on the basis of
1. Robustness to transmission errors
2. Cell size
3. Type of modulation technique used
4. Distance between the transmitter and receiver
a. 1 and 4 are correct
b. 1, 2 and 3 are correct
c. 2 and 4 are correct
d. All four are correct
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36) FDMA is the division of
a. Time
b. Phase
c. Spectrum
d. Amplitude
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37) Guard band is
a. The small unused bandwidth between the frequency channels to avoid interference
b. The bandwidth allotted to the signal
c. The channel spectrum
d. The spectrum acquired by the noise between the signal
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Answer
Explanation
Related Ques
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ANSWER: The small unused bandwidth between the frequency channels to avoid interference
Explanation:
No explanation is available for this question!
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38) Cable television is an example of
a. TDMA
b. FDMA
c. CDMA
d. SDMA
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39) In FDMA,
1. Each user is assigned unique frequency slots
2. Demand assignment is possible
3. Fixed assignment is possible
4. It is vulnerable to timing problems
a. 1 and 2 are correct
b. 2 and 4 are correct
c. 1, 2 and 3 are correct
d. All four are correct
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40) FDMA demand assignment uses
1. Single channel per carrier
2. Multi channel per carrier
3. Single transmission in one time slot
4. Multi transmission in one time slot
a. 1 and 2 are correct
b. 2, 3 and 4 are correct
c. 1, 2 and 3 are correct
d. All four are correct
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