ESE 2021 Technical Quiz 64 || Modulation Schemes and Decoding-I

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Question 1

7 signals are sampled and time multiplexed using PAM transmission. The 5 of the input signals are bandlimited to 18 kHz and rest of the 2 signals are band limited to 36 kHz. If all channels are sampled equally. The overall channel symbol rate is_________kbps.

• A320 kbps
• B324 kbps
• C230 kbps
• D222 Kbps

Question 2

For a 8-PSK operating with bit rate of 24 kbps, determine the baud rate

• A2000 symbols/sec
• B4000 symbols/sec
• C6000 symbols/sec
• D8000 symbols/sec

Question 3

A binary symmetric channel is used to transmit two signals with constellation diagram as shown below.


to keep the same average energy in both the signals the relation between the amplitudes of the two signals will be [considering the amplitude of figure I be A₁ and Amplitude of the signal used in figure II be A₂]

• A
• B
• C
• D

Question 4

A sinusoid message signal m(+) is transmitted by binary PCM without compression. If the signal to quantization noise ratio is required to be at least 48dB, the main. No. of bits per sample will be

• A8
• B10
• C12
• D14

Question 5

The min. step-size required for a Delta-modulator operating at 32 K sample/sec to track the signal (here u(t) is the n unit fx^–)
X(t) = 125t (u(t)-u(t-1)) + (250-125t) (u(t-1) – u(t-2))
So that slope overload is avoided, would be

• A2^–10
• B2^–8
• C2^–6
• D2^–4

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