Subject Code & Name: CO25401 – Communication Systems
Regulation: R-2025
Semester: IV (Fourth Semester)
Branch: B.E. Computer and Communication Engineering (CCE)
Credits / L-T-P: 4 Credits | L-T-P: 3-0-2
Course Objectives
- To introduce the concepts of various analog modulations and their spectral characteristics.
- To understand the properties of random process and principles of various pulse modulation.
- To impart Knowledge in Passband Digital Transmission.
Full Unit-wise Syllabus
Unit I – Amplitude Modulation
Basic Blocks of Communication systems, need for modulation, Amplitude modulation – Mathematical representation of AM signal, Bandwidth, current, power and transmission efficiency of AM, DSB-SC, SSB-SC, and VSB modulation, Generation and Demodulation of AM signal, SNR, Noise in AM Receiver using Envelope detection, Threshold Effect.
Activities: Group of students can design and present a poster illustrating the fundamental of Communication system and modulation.
Practical: AM Modulation and Demodulation; DSB-SC Modulation and Demodulation; SSB-SC Modulation and Demodulation.
Unit II – Angle Modulation
Types of Angle Modulation, Relation between FM and PM, Narrow Band FM, Wideband FM, Transmission Bandwidth of FM Signals, Generation of FM using Direct and Indirect methods, FM Demodulation using Slope Circuit, Frequency Discriminator, Non Linear effects in FM system, Superheterodyne receiver, FM Threshold Effect, Pre-emphasis and De-emphasis in FM, Model of PLL for FM Demodulation.
Activities: Simulation of Modulation and Demodulation Techniques using MATLAB.
Practical: FM – Modulator and Demodulator; Pre-Emphasis and De-Emphasis; Simulation of Superheterodyne Receiver.
Unit III – Random Process
Random variables, Central limit Theorem, Random Process, Stationary Processes, Mean, Correlation and Covariance functions, Ergodic Processes, Transmission of a Random Process Through a LTI filter, Power Spectral Density, Gaussian Process, Noise, Narrowband Noise.
Activities: Case Study: Role of Random Processes and Noise in Communication Systems (Choose any one real world communication such as FM radio and Mobile communication etc).
Practical: Simulating and analyzing different types of random processes using MATLAB; Compute and plot mean, autocorrelation, and cross-correlation of signals using MATLAB; Studying the propagation of noise through a communication channel.
Unit IV – Pulse Modulation
Sampling Process, Pulse Amplitude Modulation (PAM), Pulse Width Modulation (PWM) and Pulse Position Modulation (PPM), Quantization Process, Pulse Code Modulation (PCM), Noise Considerations in PCM systems, Time-Division Multiplexing (TDM), Delta Modulation, Differential Pulse Code Modulation, Adaptive Differential Pulse Code Modulation, Adaptive Delta Modulation, MPEG Audio Coding Standards.
Activities: Conduct a literature survey and reproduce results from recent research papers on “Advances in Pulse Modulation and Audio Coding Techniques”.
Practical: Pulse Amplitude Modulation and Demodulation; Pulse Width Modulation and Demodulation; Pulse Code Modulation and Demodulation.
Unit V – Passband Digital Transmission
Introduction, Passband Transmission Model, Generation and Detection, Error Probability, Power Spectra: Coherent PSK, QPSK, QAM, Coherent FSK, Differential FSK, Differential PSK, Comparison of Digital Modulation Schemes using a single carrier, Voiceband Modems.
Activities: Group of students can deliver a seminar on “Modern Digital Modulation Techniques and Their Applications”.
Practical: Amplitude Shift Keying (ASK) Modulation and Demodulation; Frequency Shift Keying (FSK) Modulation and Demodulation; Simulation of DPSK, QPSK and QAM Generation and Detection Schemes.
Course Outcomes (COs)
- CO1: Describe the fundamental concepts, elements, and classification of analog and digital communication systems.
- CO2: Analyze the performance of analog and digital modulation techniques, noise effects, and communication channels used in communication systems.
- CO3: Evaluate various communication techniques and receiver architectures based on bandwidth efficiency, noise performance, and transmission requirements.
- CO4: Design communication systems by selecting suitable modulation schemes, transmission methods, and receiver configurations for practical applications.
Assessment Pattern (Quick Note)
- Weightage: Continuous Assessment 50% | End Semester Theory Examination 50%
- Internal methodology: Activities 10% (Assignments 30, Quiz 10, Project based learning 25, Flipped Classroom 10, Review of GATE questions 25), Internal Theory Examinations 30% (TWO tests), Internal Laboratory Examination 10%
Source: Official Anna University – B.E. Computer and Communication Engineering R-2025 Syllabus
Last Updated: October 2026
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