(1) Define power and energy signals.
(2) What are the Dirichlet conditions for Fourier transform.
(3) Explain the energy spectral density. 2| |
(4) Determine the Fourier Transform for double exponential pulse whose function is given by x( ) = − . Also draw its magnitude and phase spectra.
(5) Point out the difference between differences between Convolution VS Correlation.
(6) Draw and explain the block diagram of analog communication system.
(7) Explain AM time domain analysis and AM power distribution.
(8) Draw and explain block diagram of Low level AM DSBFC transmitters.
(9) The maximum frequency deviation in an FM is 10 KHz and signal frequency is 10 KHz. Find out the bandwidth using Carson's rule and the modulation index.
(10) In an AM transmitter, the carrier power is 10 kW and the modulation index is 0.5. Calculate the total RF power delivered.
(11) State Carson’s rule.
(12) An FM transmitter has a rest frequency fc =96MHz and a deviation sensitivity K1 = 4 KHz/V. Determine the frequency deviation for a modulating signal Vm (t) =
8 sin(2π 2000t). Determine the modulation index.
(13) Define Phase modulation.
(14) Compare with waveforms following AM transmission systems:- DSBFC, DSBSC, SSBSC.
(15) Define Angle modulation with mathematical expression, its types Direct Frequency modulation (FM) and Direct Phase modulation (PM).
(16) Explain with diagram Angle modulated wave in the frequency domain and time domain.
(17) Explain with diagram Frequency up conversion by a) Heterodyne method b) Multiplication method.
(18) Draw waveforms for the following: - a) Pulse modulation a) Sample pulse b) PWM c) PPM d) PAM.
(19) State Nyquist sampling theorem/ sampling rate.
(20) What do you mean by ASK?
(21) Compare the bandwidth efficiency of BPSK and QPSK modulated signals.
(22) What is Inter symbol interference?
(23) Discuss the draw backs of delta modulation and explain the significance of adaptive delta modulator.
(24) Draw ASK and PSK waveforms for a data stream 1010101.
(25) Define information capacity.
(26) Mention any four advantage of digital modulation over analog modulation.
(27) Give the expression for Shannon limit for information capacity.
(28) Define Baud rate.
(29) What is known as Binary phase shift keying? Discuss in detail the BPSK transmitter and Receiver and also obtain the minimum double sided Nyquist bandwidth.
(30) An event has six possible outcomes with probabilities 1/2,1/4,1/8,1/16,1/32,1/32.Find the entropy of the system.
(31) Define entropy.
(32) Define rate of information transmission across the channel.
(33) Differentiate the Shannon Fano Coding and Hoffman Coding with a example.
(34) Explain Linear block codes with example.
(35) Define the Mutual Information.
(36) Differentiate between narrow band and wide band FM signal.
(37) Define noise. Explain detailed classification of noise. What are the sources of noise?
(38) Explain the Noise figure of any communication systems.
(39) What are the properties of Properties of Line Coding? Explain types of line coding.
(40) Draw and explain block diagram of Armstrong indirect FM Transmitter
