Digital Communication System
Sampling
Aliasing, Anti-aliasing 
What is the Sampling Theorem?
Nyquist Sampling Theorem
Sampling Theorem for Low Pass Signals
Pulse Amplitude Modulation
Types of Pulse Amplitude Modulation
Pulse Width Modulation
Pulse Time Modulation (PTM)
Pulse Position Modulation
Pulse Code Modulation (PCM)
What is Noise?
Bandwidth
Quantization
Differential PCM
Types of Quantizers
Noise considerations in PCM Systems
Quantization Noise and Signal-to-Noise:
Time Division Multiplexing (TDM)
Spread Spectrum Modulation
Delta Modulation
 Line Codes
Polar Signaling
Unipolar Return to Zero RZRZ
Bipolar Signaling
Power Spectral Density
Data Encoding Techniques
Pulse Shaping
M-ary Encoding