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BARC ECE 2019 : Communication Nuclear Quiz 2
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Question 1
A CDMA system is designed based on DS spread spectrum with a processing gain of 1000 and BPSK modulation scheme. If user has equal power and the desired level of performance of an error probability of 10–6, the no. of user will be
Question 2
The power spectral density of a real stationary random process .X(t) is given by
The value of the expectation
The value of the expectation
Question 3
A binary baseband digital communication system employs the signal
for transmission of bits. The graphical representation of the matched filter output y(t) for this signal will be
for transmission of bits. The graphical representation of the matched filter output y(t) for this signal will be
Question 4
In the circuit shown, the positive angular frequency ω (in radians per second). at which magnitude of the phase difference between the voltages V1 and V2 equals 
radians, is ___.
radians, is ___. Question 5
In a digital communication system, the overall pulse shape p(t) at the receiver before the sampler has the Fourier transform P(f). If the symbols are transmitted at the rate of 2000 symbols per second, for which of the following cases is inter symbol interference zero?
Question 6
Consider a white noise of 2-sided spectral density 
applied to a simple RC low pass filter whose 3dB cut-off frequency is 4kHz.The mean squared value of cut-off noise output will be
applied to a simple RC low pass filter whose 3dB cut-off frequency is 4kHz.The mean squared value of cut-off noise output will be Question 7
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?
Which one of the following correctly related Fb and Fd?
Question 8
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
Question 9
A sampled signal that varies from –1 volt and +1 volt is quantized using ‘n’ bits. The signal is band limited to 5KHz. The minimum value of ‘n’ for the maximum quantization error to be less than 5mV is
Question 10
For the probability density function shown below find 
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