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GATE 2023 Communication System Quiz 34

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Question 1

A QPSK signal is used to send data over a satellite transponder. The transponder has a bandwidth of 12 MHz. Which of the following data rate can be supported by the transponder?

Question 2

Consider the two 8-point signal point constellation shown in figure below.

It is desired to assign three data bits to each point of the signal constellation such that the nearest (adjacent) points differ in only one bit position. This encoding scheme is possible for

Question 3

Binary data is to be transmitted at the rate Rb = 800 kbps on a radio channel having 250 kHz bandwidth. The modulation method that minimizes the signal energy is

Question 4

Assume a binary bit stream is to be modulated on an RF carrier. The baseband bit stream has a data rate of 1 Mbits/sec. Let BPSK signaling scheme is used.

If simple rectangular pulses are used, then the first zero crossing bandwidth of the RF spectrum is --------MHz.

Question 5

Assume a binary bit stream is to be modulated on an RF carrier. The baseband bit stream has a data rate of 1 Mbits/sec. Let BPSK signaling scheme is used.

If raised cosine roll off pulses with factor α = 1/3 is used, then the absolute bandwidth of RF spectrum is --------MHz.

Question 6

Assume that 4800 bits/sec random data are sent over a bandpass channel by BPSK signaling. What is the required transmission bandwidth in kHz such that the spectral envelope is down at least 35 dB outside this band ? [use sinc2(17.57) = 10-7/2]

Question 7

In digital transmission, binary rate is represented by raised cosine function with roll-off factor is 0.2 and transmitted using QPSK modulation, then the bandwidth efficiency____%
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Jan 18ESE & GATE EC