IK2509 Digital Communications Theory 7.5 credits

Digital kommunikationsteori

Offering and execution

Course offering missing for current semester as well as for previous and coming semesters

Course information

Content and learning outcomes

Course contents *

- Introduction, representation of bandpass (radio) signals. Equivalent lowpass representation.- Signal space concept, representation of digital communication signals, power spectra of digitally modulated signals.- Detection and performance of digital modulated signals in AWGN channels.- Bandlimited channels, channel modeling, discrete representation of bandlimited channels.- Equalization techniques (linear and nonlinear equalizers), performance of different equalization techniques. Adaptive equalizations.- Fading multipath channels, channel modeling. Digital communication signals through fading multipath channels, link analysis and techniques to improve the performance over such channels.- Multicarrier modulation techniques, the OFDM technique, OFDM versus time domain equalization.- Spread spectrum modulation techniques, direct sequence modulation and frequency hopping modulation.

Intended learning outcomes *

The objective of the course is to give the student an in-depth treatment of modern digital communication systems.  Upon completion of the course, the student should be able to: - Evaluate digital communication links (spectral properties, bit error rate) in a structured way and evaluate tradeoffs. - Master the theory of digital communication and its benefits as compared to analogue communications. - Perform system simulations (modulation/demodulation methods, bit error rate, and channel models) and compare to the theory covered in the course. - Describe different types of equalization methods and how they solve the problem of intersymbol-interference over communication channels with distortion. - Describe and analyse different types of spread spectrum modulation methods and the advantages they bring to modern communication systems. - Describe and analyze Orthogonal Frequency Division Multiplexing (OFDM) and its suitability for future communication systems. Its advantages and drawbacks as compared to single carrier.  

Course Disposition

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Literature and preparations

Specific prerequisites *

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Recommended prerequisites

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Digital Communications, J. G. ProakisUpplaga: Fourth edition Förlag: McGraw-Hill År: 2001ISBN: 0-07-118183-0   Undervisningsspråk: Engelska

Examination and completion

Grading scale *

A, B, C, D, E, FX, F

Examination *

  • INLA - Assignment, 4.5 credits, Grading scale: A, B, C, D, E, FX, F
  • PROA - Take-home exam, 3.0 credits, Grading scale: A, B, C, D, E, FX, F

Based on recommendation from KTH’s coordinator for disabilities, the examiner will decide how to adapt an examination for students with documented disability.

The examiner may apply another examination format when re-examining individual students.

Other requirements for final grade *

  INL1: Homework problems, Grade P/F   TEN1: Final exam, Grade AF To pass the course at least 50% score in the exam is needed. The course contains 10 homeworks that give bonus points and can be added to the final exam.

Opportunity to complete the requirements via supplementary examination

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Opportunity to raise an approved grade via renewed examination

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Further information

Course web

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Offered by

EECS/Computer Science

Main field of study *

Electrical Engineering

Education cycle *

Second cycle

Add-on studies

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Ben Slimane

Ethical approach *

  • All members of a group are responsible for the group's work.
  • In any assessment, every student shall honestly disclose any help received and sources used.
  • In an oral assessment, every student shall be able to present and answer questions about the entire assignment and solution.