Recent questions tagged analog-communications

Quadrature multiplexing isthe same as $\text{FDM}$the same as $\text{TDM}$a combination of $\text{FDM}$ and $\text{TDM}$quite different from $\text{FDM}$ and $\text{TDM}$

Compression in $\text{PCM}$ refers to relative compression ofhigher signal amplitudeslower signal amplitudeslower signal frequencieshigher signal frequencies

For a given data rate, the bandwidth $\mathrm{B}_{p}$ of a $\text{BPSK}$ signal and the bandwidth $\text{B}_{0}$ of the $\mathrm{OOK}$ signal are related as$\mathrm{B}_{p...

The probability density function of the envelope of narrow band Gaussian noise isPoissonGaussianRayleighRician

The maximum usable frequency of an ionospheric layer at $60^{\circ}$ incidence and with $8 \; \mathrm{mHz}$ critical frequency is$16 \; \mathrm{MHz}$$\frac{16}{\sqrt{3}} ...

The pulse rate in a $\text{DM}$ system is $56,000$ per sec. The input signal is $5 \cos (2 \pi \; 1000 \; t)+2 \cos (2 \pi \; 2000 \; t) \; \mathrm{V}$, with $t$ in sec. ...

An $\text{SSB}$ signal is demodulated by using a synchronous demodulator. However, the locally arranged carrier has a phase error $0$. Determine the effect of the error o...

The input to a coherent detector is DSB-SC signal plus noise. The noise at the detector output isthe in-phase componentthe quadrature-componentzerothe envelope

The noise at the input to an ideal frequency detector is white. The detector is operating above threshold. The power spectral density of the noise at the output israised-...

A DSB-SC signal is to be generated with a carrier frequency $f_{t}=1 \; \mathrm{MHz}$ using a non-linear device with the input-output characteristic\[v_{0}=a_{0} v_{i}+a_...

The data for Q. 75-76 are given below. Solve the problems and choose the correct answers.Let $m(t)=\cos \left[\left(4 \pi \times 10^{3}\right) t\right]$ be the message si...

The data for Q. 75-76 are given below. Solve the problems and choose the correct answers.Let $m(t)=\cos \left[\left(4 \pi \times 10^{3}\right) t\right]$ be the message si...

Choose the correct one from among the alternative $\text{A, B, C. D}$ after matching an item in Group $1$ with the most appropriate item in Group $2.$$\begin{array}{ll}\q...

A superheterodyne receiver is to operate in the frequency range $550 \; \mathrm{kHz}-1650 \; \mathrm{kHz}$, with the intermediate frequency of $450 \; \mathrm{kHz}$. Let ...

A sinusoidal signal with peak-to-peak amplitude of $1.536 \mathrm{~V}$ is quantized into $128$ levels using a mid-rise uniform quantizer. The quantization-noise power is$...

If $\text{S}$ represents the carrier synchronization at the receiver and $\rho$ represents the bandwidth efficiency, then the correct statement for the coherent binary $\...

Choose the correct one from among the alternatives $\mathrm{A}, \mathrm{B}, \mathrm{C}, \mathrm{D}$ after matching an item from Group $1$ with the most appropriate item i...

In a microwave test bench, why is the microwave signal amplitude modulated at $1 \; \mathrm{kHz}$?To increase the sensitivity of measurementTo transmit the signal to a fa...

(A) $\text{AM}$ system(B) $\text{DSB-SC}$ system(C) $\text{PAM}$ systemCoherent detectionEnvelope detectionCorrelation detection$\text{PLL}$$\text{LPF}$

Find the correct match between group $1$ and group $2.$Group I$\begin{array}{l}\mathrm{P}-\{1+k m(t)\} \mathrm{A} \sin \left(\omega_{c} t\right) \\\mathrm{Q}-k m(t) \math...

Which of the following analog modulation scheme requires the minimum transmitted power and minimum channel bandwidth?VSBDSB-SCSSBAM

A device with input $x(t)$ and output $y(t)$ is characterized by: $y(t)=x^{2}(t)$.An FM signal with frequency deviation of $90 \; \mathrm{kHz}$ and modulating signal band...