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Subject Revision:Digital Communication Quiz

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Question 1

Consider sinusoidal modulation in an AM system. Assuming no overmodulation, the modulation index (μ) when the maximum and minimum values of the envelope, respectively, are 3 V and 1 V, is ________.

Question 2

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 3

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

Question 4

Consider the periodic square wave in the figure shown.

The ratio of the power in the 7th harmonic to the power in the 5th harmonic for this waveform is closest in value to _______.

Question 5

Let Q(√γ) be the BER of a BPSK system over an AWGN channel with two-sided noise power spectral density N0/2. The parameter γ  is a function of bit energy and noise power spectral density.
A system with two independent and identical AWGN channels with noise power spectral density N0/2 is shown in the figure. The BPSK demodulator receives the sum of outputs of both the channels.

If the BER of this system is then the value of b is _____________.

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