List of top Electronics and Communication Engineering Questions on communication systems

In a DPSK system the input bit sequence is 1101, initial phase = 0. The transmitted phase sequence is:
A binary signal is transmitted at 10kbps using NRZ signaling. Find the minimum channel bandwidth required in KHz:
The carrier \( c(t) = A\cos(2\pi \times 10^6 t) \) is angle modulated (PM or FM) by the signal \( m(t) = 2\cos(4000\pi t) \). The deviation constants are \( k_p = 3\,\text{rad/V} \) & \( k_f = 3000\,\text{Hz/V} \). The value of modulation indices \( \beta_f \) & \( \beta_p \) are:
Which access technique is primarily used in the Global System for Mobile communications (GSM)?
The matched filter is equivalent to which of the following?
Calculate power in each sideband, if power of carrier wave is 176W and there is 60% modulation in amplitude modulated signal?
A Gaussian noise channel has a bandwidth of $4\text{ kHz}$ and a signal-to-noise power ratio (SNR) of $15$. According to the Shannon-Hartley theorem, what is the maximum capacity of this channel?
In a coherent BPSK modulation scheme, if the input bit rate is doubled while keeping the symbol energy as constant, what is the effect on the transmission bandwidth ($BW$) and the probability of bit error ($P_e$)?
Which of the following is a salient feature of GSM _____.
Which of the following digital modulation schemes has the lowest probability of error at a given SNR?
What is the primary advantage of using a super-heterodyne receiver?
In communication receivers, the filter used to reduce receiver gain at some specific frequency is
Which of the following is not correct if the intermediate frequency is too high?
Match the following: A: ASK, B: APK, C: PSK, D: FSK
The problem of reducing the gain of receiver for weak signals is avoided by
The Foster-Seeley discriminator along with amplitude limiter is called
A four level PAM has a input data rate of \(2400~bits/s\) then the symbol rate is
What are the conditions for distortion less transmission through a system?
The following are properties of auto correlation except
A random process is stationary
A receiver connected to an antenna whose resistance is \(50~\Omega\) has an equivalent noise resistance of \(30~\Omega\). Calculate the receiver's noise figure?
A TDM system is used to multiplex four independent voice signals each sampled at the rate of 8 kHz using PAM. The system incorporates a synchronizing pulse train for its proper operation. Calculate the transmission bandwidth?
To develop the time-domain description of SSB modulation, the required mathematical tool is known as
In the transmission of television signals in practice, a controlled amount of carrier is added to the VSB modulated signal. This is done to use
Prior to sampling, the type of filter used to attenuate high frequency components of the signal that lie outside the band of interest is