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Digital Communications - 4PMICNU1

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  • Number of hours

    • Lectures : 14.0
    • Tutorials : 8.0
    • Laboratory works : 8.0
    • Projects : 0
    • Internship : 0
    ECTS : 2.5

Goals

The main objective is to give the basic principle of digital transmission, consisting in sending digital information into physical (analog) channel, ans see current basic techniques. I uses Information Theory results (C. Shannon) to give and interpret achievable performance and position the performance of basic modulations techniques (especially in terms of spectral efficiency and energy efficiency trade-offs). Other objective is to briefly present gives also a brief introduction of present radio-frequency transmission systems (e.g. : Mobile communication).

Contact Laurent ROS

Content

1. Base-band digital transmission

  • line code : M-ary modulation with orthogonal Dictionnaries, Linear Modulations (Pulse-amplitude Modulations), general properties (power, power spectrum density, euclidian distance, energy and spectral efficiencies)
  • Performance over AWGN channel case: Matched filter (Correlator), Nyquist criteria (Free Inter-Symbol-Interference criterion)
    2. Carrier frequency digital transmission :
    -Digital modulation : I/Q modulation-demodulation, linear (phase, amplitude, quadrature-amplitude) modulations,
    -Coherent reception (AWGN case): detection theory, performances (bit error rate, spectral efficiency, distance from information theory),

3. Radio transmission systems :
General information about transmission systems (microwave links, satellite links, and radio-mobile communications, introduction to advances transmissions techniques such as CDMA (used in UMTS, ...) and OFDM (used in DVB, TNT, ...).

Part 1 will be treated in depth, while Parts 2 and 3 will be seen only briefly as extensions.

The course will be illustrated by classic Classworks as well as by Labworks sessions. The latter will consist of a guided mini-project consisting of developing a digital communication simulation chain and interpreting the results directly linked to the course. This will will result in the redaction of a report which will be noted (1/3 of the overall mark).



Prerequisites
  • Basic of Deterministic signal Processing (Analog and Digital)
  • Basic of Random Signal Processing (Stationry stochastic process, Correlation and Spectrum, White Gaussian Noise)

Tests

1 Written exam (2 h) (E).
1 report after Labworks (C)



N1=E1x0.65 + Cx0.35
N2=E2x0.65 + Cx0.35

Additional Information

Curriculum->Engineering degree->Semester 8

Bibliography

J. Proakis and M. Salehi. Digital Communications. McGraw-Hill, 2008 (fifth edition).
S. Haykin. “Digital Communications”. Wiley, 1988 (and more recent editions, up to 2013)Glavieux, M. Joindot. Communications numériques, introduction. Collection pédagogique des télécommunications, Masson, 1996.

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Date of update July 29, 2020

Université Grenoble Alpes