Unit 1978: Communication Systems

1. Introduction to Communication Systems

• Overview of communication systems
• Types of communication: analog vs digital
• Components of a communication system
  • Transmitter
  • Channel
  • Receiver
• Basic principles of analog communication
• Basic principles of digital communication

2. Analog Communication

• Definition and significance
• Analog modulation techniques
  • Amplitude Modulation (AM)
    • Principles
    • Types (DSB, SSB, VSB)
  • Frequency Modulation (FM)
    • Principles
    • Modulation index
  • Phase Modulation (PM)
    • Principles
    • Relationship with FM
• Advantages of analog communication
• Limitations of analog communication

3. Digital Communication

• Overview of digital communication systems
• Digital modulation techniques
  • Amplitude Shift Keying (ASK)
    • Principle and waveform
  • Frequency Shift Keying (FSK)
    • Principle and waveform
  • Phase Shift Keying (PSK)
    • BPSK, QPSK variants
• Digital data transmission concepts
• Encoding and decoding methods

4. Analog-to-Digital Conversion

• Purpose and importance
• Sampling
  • Sampling theorem
  • Nyquist theorem
• Quantization
  • Types of quantization
  • Quantization error
• Encoding of sampled signals

5. Digital-to-Analog Conversion

• Need for digital-to-analog conversion
• Pulse Amplitude Modulation (PAM)
  • Concept and waveform
• Pulse Code Modulation (PCM)
  • Steps: Sampling, Quantization, Encoding
• Applications

6. Noise in Communication Systems

• Introduction to noise
• Types of noise
  • Thermal noise
  • Intermodulation noise
  • Quantization noise
• Effects of noise on communication quality
• Noise mitigation techniques
  • Filtering
  • Shielding
  • Error detection and correction

7. Modulation and Demodulation

• Purpose of modulation
• Modulation techniques overview
• Detailed modulation schemes
• Demodulation techniques
  • Coherent and non-coherent detection
• Practical considerations in modulation/demodulation

8. Communication Channel Characteristics

• Channel bandwidth
• Signal-to-noise ratio (SNR)
• Distortion types
• Channel capacity
  • Shannon-Hartley theorem
• Factors influencing communication quality

9. Information Theory

• Introduction to information theory
• Entropy and information content
• Channel capacity revisited
• Error-correcting codes
  • Basic concepts
  • Importance in reliable communication