Unit 1 Basics of Digital Communication
1.1 Introduction
1.2 Why Digital Communication is needed?
1.3 Block diagram of Digital communication system
1.4 Communication channel – 1.4.1 Types of digital Communication channel 1.4.2 Characteristics of communication channel 1.4.3 Comparison of communication channels
1.5 Chanel modelling -1.5.1 Additive Gaussian Noise Channel 1.5.2 Bandwidth Limited Linear channel 1.5.3 Linear Time Variant Channels
1.6 Channel noise and its effect – 1.6.1 Channel Noise 1.6.2 Types of Noise
1.6.3 Effects of Noise
1.7 Comparison of analog and digital communication system
1.8 Advantages and disadvantages of digital communication – 1.8.1 Advantages of Digital Communication over Analog Communication 1.8.2 Disadvantages of Digital Communication over Analog Communication.

Unit 2 Pulse Code Modulation
2.1 Introduction
2.2. Pulse Code Modulation (PCM)
2.3 Sampling Process
2.4 Quantization Process – 2.4.1 Quantizing an Analog Signal 2.4.2. Types of Quantization 2.4.3 Quantization Error
2.5 Pulse-Code Modulation (PCM)-2.5.1 Block Diagram and Working of PCM Transmitter and Receiver
2.6 Advantages and Disadvantages and Applications of Pulse Code Modulation

Unit 3 Digital Modulation Techniques
3.1 Introduction
3.2 Digital modulation system
3.3 Amplitude Shift Keying (ASK) – 3.3.1 Bandwidth of ASK 3.2.2 ASK Modulator/ Generation Concept 3.3.3 ASK Demodulator 3.3.4 Advantages of ASK modulation 3.3.5 Disadvantages of ASK modulation 3.3.6 Applications of ASK modulations
3.4 Frequency Shift Keying (FSK)- 3.4.1 FSK Bandwidth 3.4.2 FSK Modulator 3.4.3 FSK Demodulator 3.4.4 Advantages of FSK 3.4.5 Disadvantages of FSK 3.4.6 Applications of FSK
3.5 Phase Shift Keying (PSK) – 3.5.1 Bandwidth of the PSK signal 3.5.2 Phase Shift Keying (PSK) Modulator 3.5.3 Phase Shift Keying (BPSK) Demodulator 3.5.4 Advantages of Phase Shift Keying 3.5.5 The Disadvantages of Phase-Shift Keying Include 3.5.6 Applications of Phase Shift Keying
3.6 Compression of ASK, FSK and PSK
3.7 Compression between Amplitude Modulation (AM) and ASK.

Unit 4 Satellite Communication
4.1 Introduction
4.2 Need for satellite communication
4.3 Geostationary Satellite and geo stationary orbit
4.4 Important features of satellite to provide communication
4.5 Principle of Satellite communication
4.6 Block diagram of Uplink Section and its explanation
4.7 Block diagram of Transponder present on the satellite and its explanation
4.8 Block diagram of Down link Section and its explanation
4.9 Simplified block diagram of Earth Station
4.10 Global positioning system (GPS)
4.11 Trilateration method used with GPS system
4.12 Very Small Aperture Terminal (VSAT)
4.13 Path losses

Unit 5 Mobile Telephony System
5.1 Introduction
5.2 Basic concept of mobile communication
5.3 Operation of Cellular system
5.4 Frequency bands used in mobile communication
5.5 Concept of Frequency reuse, Cell splitting and Cell sectoring
5.6 SIM (Subscriber Identification Module) Number
5.7 IMEI (International Mobile Equipment Identity) Number
5.8 Encryption
5.9 Architecture of mobile communication network (GSM)
5.10 Global System for Mobile (GSM) Communication
5.11 Types of Multiple Access Techniques – 5.11.1 Frequency Division Multiple Access (FDMA) 5.11.2 Time Division Multiple Access (TDMA) 5.11.3 Code Division Multiple Access (CDMA) 5.11.4 Comparison of FDMA, TDMA and CDMA
5.12 Simplified block diagram of mobile phone handset
5.13 1G, 2G, 3G and 4G concepts