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GATE EC 2020: Communication System Quiz 8

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Question 1

The bit rate of a digital communication system is 34M bits. The modulation scheme is QPSK. The baud rate of the system is

Question 2

A QPSK modulator has an input data rate of 90 Mbps and a carrier frequency 65 MHz. The minimum double sided Nyquist bandwidth is ________MHz.

Question 3

Consider minimum shift keying (MSK) also known as fast FSk with freq. spacing 2Fd between the state freq. Fb is the data rate.
Which one of the following correctly related Fb and Fd?

Question 4

A DS/BPSK spread spectrum signal has a process gain of 500. If the desired error probability is 10–5 and (Eb/J0) required to obtain an error probability of 10–5 for binary PSK is 9.5 dB, then the Jamming margin against a containers tone jammer is

Question 5

If band width required to transmit BPSK signal is 1000 KHz. than the band width required for Q ary PSK transmission is

Question 6

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]
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Aug 14ESE & GATE EC