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Advanced Coding, Modulation and Signal Processing

  • Laurent Clavier
  • Dejan Vukobratovic
  • Matthias Wetz
  • Werner Teich
  • Andreas Czylwik
  • Kimmo Kansanen
Part of the Signals and Communication Technology book series (SCT)

Abstract

This chapter deals with advanced coding, physical layer and signal processing issues. The evolution of technologies makes the specific activities on these subjects in the COST 2100 action disparate. One reason is that the amount of work available in the community is huge, and it can appear that the real challenges for future networks are not in algorithms or new coding schemes. However this point of view can be mitigated because new networks induce new constraints that modify the way to optimize traditional techniques. A second reason is that many works are connected to specific applications.

In Sect. 9.1, we consider advanced coding techniques and, more specifically, the design of physical layer FEC schemes based on LDPC codes. The coding over bits idea is then replaced by coding over packets, and packet-based application layer FEC techniques are presented. Section 9.2 is dedicated to another essential topic in coding, iterative techniques. Iterative demodulation and decoding, turbo equalization are discussed, and some more general tools are presented for application and design of iterative schemes: factor graphs, Sum-Product Algorithm (SPrA) and Extrinsic Information Transfer (EXIT) charts.

A lot of consideration has also been put on multicarrier and adaptive schemes. They are discussed in Sect. 9.3.

Section 9.4 discusses channel estimation and synchronization. Some solutions to face network evolutions are discussed. Especially, ways to reduce the needed signalization in Frequency-Division Duplex (FDD) context, considerations on complexity/performance trade-offs, channel estimation in high mobility and frame synchronization using the constraints imposed by coding are proposed. This chapter ends on the important topic of network interference. A modeling approach based on α-stable distribution is proposed when IR-UWB is concerned and the consequences on receiver design and multihop transmissions are discussed. Finally solutions for interference limited OFDM systems are proposed.

Keywords

Orthogonal Frequency Division Multiplex Channel Estimation Minimum Mean Square Error Orthogonal Frequency Division Multiplex System Forward Error Correction 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag London Limited 2012

Authors and Affiliations

  • Laurent Clavier
    • 1
  • Dejan Vukobratovic
    • 2
  • Matthias Wetz
    • 3
  • Werner Teich
    • 3
  • Andreas Czylwik
    • 4
  • Kimmo Kansanen
    • 5
  1. 1.University of LilleLilleFrance
  2. 2.Faculty of Technical SciencesUniversity of Novi SadNovi SadSerbia
  3. 3.University of UlmUlmGermany
  4. 4.Universität Duisburg-EssenDuisburgGermany
  5. 5.Norwegian University of Science and TechnologyTrondheimNorway

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