Digital Communication System MCQs

A source produces binary data at the rate of 10 kbps. The binary symbols are represented as shown in the figure 11.6 given below.The source output is transmitted using two modulation schemes, namely Binary PSK (BPSK) and Quadrature PSK (QPSK). Let B1 and B2 be the bandwidth requirements of BPSK and QPSK respectively. Assuming that the bandwidth of the above rectangular pulses is 10 kHz, B1 and B2 are

Noise with uniform power spectral density of No W/Hz is passed through a filter H(o))= 2 exp (--joAd) followed by an ideal low pass filter of bandwidth B Hz. The output noise power in Watts is

A low-pass filter having. a frequency response H (jot)) = A (co) ellKw) does not produce any phase distortion, if

The minimum sampling frequency (in samples/sec) required to reconstruct the following signal from its samples without distortion

A zero- mean white Gaussian noise is passed through an ideal lowpass filter of bandwidth 10 kHz. The output is the uniformly sampled with sampling period ts = 0.03 msec. The samples so obtained would be

A message signal with bandwidth 10 kHz is Lower-Side Band SSB modulated with carrier frequency fci = 106 Hz. The resulting signal is then passed through a Narrow-Band Frequency Modulator with carrier frequency f2 =109Hz.The bandwidth of the output would be

The following two questions refer wide sense stationary stochastic processesI. It is desired to generate a stochastic process (as voltage process) with power spectral density.by driving a Linear-Time-Invariant system by zero mean white noise (as voltage process) with power spectral density being constant equal to I. The system which can perform the desired task could be

The parameters of the system obtained in above question would be

I x I << 1, coth (x) can be a proximated as