In polarization division technique ______ polarization is used.

1.Orthogonal

2.Non orthogonal

3.Orthogonal & Non orthogonal

4.None of the mentioned

In soft decision approach 100 means?

1.Certainly one

2.Certainly zero

3.Very likely zero

4.Very likely one

Adding improvement to the signal subset choice by starting with the densest possible lattice for the space is called as

1.Optimum signal constellation boundaries

2.Higher density lattice structures

3.Trellis coded modulation

4.None of the mentioned

Average effective information is obtained by

1.Subtracting equivocation from entropy

2.Adding equivocation with entropy

3.Ratio of number of error bits by total number of bits

4.None of the mentioned

Channelization characterized by orthogonal spectra is called as

1.Time division multiplexing

2.Frequency division multiplexing

3.Time division & Frequency division multiplexing

4.None of the mentioned

Choosing a closely packed signal subset from any regular lattice or array of candidate points is called as

1.Optimum signal constellation boundaries

2.Higher density lattice structures

3.Trellis coded modulation

4.None of the mentioned

Codeâ€™s redundancy is given as

1.n/k

2.k/n

3.nk

4.None of the mentioned

Components used for generation of turbo codes are

1.Inter leavers

2.Punching pattern

3.Inter leavers & Punching pattern

4.None of the mentioned

Decoders are connected in series.

1.True

2.False

Entropy is the measure of

1.Amount of information at the output

2.Amount of information that can be transmitted

3.Number of error bits from total number of bits

4.None of the mentioned

Equivocation is the

1.Conditional entropy

2.Joint entropy

3.Individual entropy

4.None of the mentioned

For a error free channel, conditional probability should be

1.Zero

2.One

3.Equal to joint probability

4.Equal to individual probability

For more than two quantization level, _______ is used.

1.Hard decision

2.Soft decision

3.Hard & Soft decision

4.None of the mentioned

Greater the redundancy lesser is the bandwidth expansion.

1.True

2.False

How can the throughput of the system be increased?

1.Increasing EIRP

2. Increasing channel bandwidth

3.Decreasing system losses

4.All of the mentioned

In double side band spectrum which side-band is called as inverted side-band?

1.LSB

2.USB

3.LSB & USB

4.None of the mentioned

In MFSK, R/W

1.Increases with increase in M

2.Increases with decrease in M

3.Decreases with increase in M

4.Is not dependent on M

In MPSK, R/W

1.Increases with increase in M

2.Increases with decrease in M

3.Decreases with increase in M

4.Is not dependent on M

In soft decision approach 0 represents

1.Certainly one

2.Certainly zero

3.Very likely zero

4.Could be either zero or one

In soft decision approach what does -127 mean?

1.Certainly one

2.Certainly zero

3.Very likely zero

4.Very likely one

In which technique spot beam antennas are used to point the radio signals in different directions?

1.Code division

2.Space division

3.Frequency division

4.None of the mentioned

QAM is a combination of

1.ASK and FSK

2.ASK and PSK

3.PSK and FSK

4.None of the mentioned

QPSK amplitude modulates

1.Sine function

2.Cosine function

3.Sine & Cosine function

4.None of the mentioned

QPSK is a composite of

1.Two BPSK

2.Three BPSK

3.Two FSK

4.Two M-ary PSK

The bandwidth efficiency increases as M increases.

1.True

2.False

The bandwidth efficiency of MFSK is

1.M/log2M

2.log2M/M

3.M/log10M

4.log10M/M

The bandwidth efficiency of QFSK is _______ that of BFSK.

1.Greater than

2.Less than

3.Equal to

4.None of the mentioned

The capacity relationship is given by

1.C = W log2 ( 1+S/N )

2.C = 2W log2 ( 1+S/N )

3.C = W log2 ( 1-S/N )

4.C = W log10 ( 1+S/N )

The IF transmission bandwidth of MFSK is

1.M/T

2.T/M

3.2M/T

4.M/2

The inter leaver connected between the two decoders is used to

1.Remove error bursts

2.Scatter error bursts

3.Add error bursts

4.None of the mentioned

The minimum nyquist bandwidth needed for baseband transmission of Rs symbols per second is

1.Rs

2.2Rs

3.Rs/2

4.Rs2

The mixing and filtering of DSB removes

1.LSB

2.USB

3.LSB & USB

4.None of the mentioned

The orbital period of communication satellites is _______ as that of earthâ€™s rotational period.

1.Same

2.Greater

3.Lesser

4.None of the mentioned

The primary communication resource is

1.Transmitted power

2.Received power

3.Efficiency

4.None of the mentioned

The super group is made up of

1.Five groups

2.Sixty channels

3.Five groups & Sixty channels

4.None of the mentioned

The system will be more bandwidth efficient as WTb decreases.

1.True

2.False

The transmission rate is given as

1.R/log2M

2.log2M/R

3.R/log10M

4.log10M/R

Trellis coded modulation uses

1.Non binary method

2.Uses redundant bits

3.No expansion of bandwidth

4.All of the mentioned

Turbo code is a

1.Serial concatenation code

2.Parallel concatenation code

3.Block code

4. None of the mentioned

Turbo codes are

1.Forward error correction codes

2.Backward error correction codes

3.Error detection codes

4.None of the mentioned

Which modulation has lower side lobe levels?

1.QPSK

2.OQPSK

3.BPSK

4.MSK

Which modulation is selected for power limited system?

1.MPSK

2. MFSK

3.MPSK & MFSK

4. None of the mentioned

Which modulation is spectrally more efficient?

1.BPSK

2.MSK

3.QPSK

4.OQPSK

Which modulation is the most efficient one?

1.BPSK

2.BFSK

3. QPSK

4.QAM

Which modulation requires more bandwidth?

1.QPSK

2.OQPSK

3.BPSK

4.BFSK

Which modulation scheme uses nonlinear transponders?

1.MSK

2.Offset QPSK

3.MSK & Offset QPSK

4.None of the mentioned

Which modulation spectrum has narrow main lobe?

1.QPSK

2.OQPSK

3.BPSK

4.MSK

Which parameter is called as Shannon limit?

1.PB/N0

2.EB/N0

3.EBN0

4. None of the mentioned

Which refers to the presence of error correction coding scheme?

1.Coded

2.Uncoded

3.Coded & Uncoded

4.None of the mentioned

Which technique can be used for bandwidth reduction?

1.BPSK

2.QPSK

3.MPSK

4.MFSK

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