List of top Electronics and Communication Engineering Questions on communication systems asked in AP PGECET

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?