Course Handout

• L: T: P: 3: 0: 2, Credit: 04

• Branch: ECE & ENC Batch: 3rd Year (6th Sem)

Upon completion of this course, the students will be able to:

1. Evaluate different modulation techniques in the presence of AWGN working under the various capacity constraints.

2. Incorporate digital formats and M-ary baseband modulations to improve bandwidth efficiency.

3. Perform statistical analysis of the transmitted and received modulated wave forms from estimation and detection point of view.

4. Improve the overall performance of digital communication systems by interference suppression/ excision and by implementing the signal-to-noise-ratio enhancement techniques.

5. Analyze the concepts of correlative coding and channel coding to mitigate the effects of interference and noise in the channel.

1. Introduction to Pulse Modulation Systems: Basic model of digital communication system, Bandpass and lowpass signal and system representations, lowpass equivalent of bandpass signals, Sampling theorem for baseband and bandpass signals, quantization, companding, signal reconstruction filter, Shannon-Hartley channel capacity theorem, Bandwidth – SNR tradeoff and bounds, Difference between analog pulse modulation and digital pulse modulation techniques, Details about PCM, Differential-PCM, DM, Adaptive-DM, time-division-multiplexed system (T- & E-type), and output SNR calculations

2. Digital Formats and Baseband Shaping for Data Transmission: NRZ, RZ, Manchester formats, Power spectra of discrete-PAM signals, ISI, Nyquist’s criterion for distortionless baseband transmission with ideal and practical solutions, generalized correlative coding and its types, and eye pattern

3. Fundamentals of Detection and Estimation: Gram-Schmidt orthogonalization procedure, MAP criterion, maximum likelihood (ML) decision rule, Correlator receiver, Matched filter receiver, ML estimation procedure, probability of bit-error & symbol-error calculations for digital modulation techniques under AWGN channel, and union bound on probability of error

4. Digital Modulation Schemes With & Without Memory: Details about Binary-ASK, BFSK, BPSK, QPSK, M-ary ASK, M-ary FSK, M-ary PSK, M-ary QAM; MSK, generalized continuous-phase-FSK; Differential-PSK, phase-locked-loop, and carrier recovery procedures

5. Coding Aspects: Block-code generation, its types and decoding procedures, convolutional code generation, its types and Viterbi decoding procedure, error detection and correction concepts in decoding

6. Multiple Access Techniques: Brief introduction about TDMA, FDMA, WDMA, CDMA, and OFDM systems

Text Books:

1. Simon Haykin, Digital Communications, Wiley, Student Edition (1988)

2. John G. Proakis, Digital Communications, McGraw-Hill, Third Edition (1994)

3. Bernard Sklar, Digital Communications: Fundamentals and Applications, Prentice Hall (2001)

Reference Books:

1. Taub & Schilling, Principles of Communication Systems, McGraw-Hill Publications, Second Edition (1998)

2. Simon Haykin, Communication Systems, Wiley, Fourth Edition (2006)

3. B.P. Lathi, Modern Analog and Digital Communication Systems, Oxford University Press, Third Edition (1998)

Practical/experiments based on the hardware using communication kits, and simulation with the help of available simulation packages.

• MST ----- 30

• EST ------ 40

• Sessional ------ 30

Note: Sessional Includes Lab, Assignments and Quiz Marks