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Anna University · Regulation 2021

EC 3491 Communication Systems question papers

EC3491 Communication Systems previous year question papers from Anna University (Regulation 2021), with the full syllabus. Read online or download the PDF.

Fourth semester · Core · L T P C: 3 0 0 3

Question papers

Syllabus

  1. Unit 1: Amplitude Modulation9 hours

    Review of signals and systems · Time and Frequency domain representation of signals · Principles of Amplitude Modulation Systems · DSB, SSB and VSB modulations · Angle Modulation · Representation of FM and PM signals · Spectral characteristics of angle modulated signals · SSB Generation · Filter and Phase Shift Methods · VSB Generation · Filter Method · Hilbert Transform · Pre-envelope & complex envelope AM techniques · Superheterodyne Receiver

  2. Unit 2: Random Process & Sampling9 hours

    Review of probability and random process · Gaussian and white noise characteristics · Noise in amplitude modulation systems · Noise in Frequency modulation systems · Pre-emphasis and De-emphasis · Threshold effect in angle modulation · Low pass sampling · Aliasing · Signal Reconstruction · Quantization · Uniform & non-uniform quantization · quantization noise · Nyquist criterion · Logarithmic Companding · PAM, PPM, PWM, PCM · TDM, FDM

  3. Unit 3: Digital Techniques9 hours

    Pulse modulation Differential pulse code modulation · Delta modulation · Noise considerations in PCM · Digital Multiplexers · Channel coding theorem · Linear Block codes · Hamming codes · Cyclic codes · Convolutional codes · Viterbi Decoder

  4. Unit 4: Digital Modulation Scheme9 hours

    Geometric Representation of signals · Generation, detection, IQ representation, PSD & BER of Coherent BPSK, BFSK, & QPSK · QAM · Carrier Synchronization · Structure of Non-coherent Receivers Synchronization and Carrier Recovery for Digital modulation · Spectrum Analysis · Occupied bandwidth · Adjacent channel power · EVM · Principle of DPSK

  5. Unit 5: Demodulation Techniques9 hours

    Elements of Detection Theory · Optimum detection of signals in noise · Coherent communication with waveforms · Probability of Error evaluations · Baseband Pulse Transmission · Inter symbol Interference · Optimum demodulation of digital signals over band-limited channels