Codes and Turbo Codes

ISBN-13: 9782817800387 / Angielski / Miękka / 2010 / 400 str.

Berrou

Opis

What is commonly called the information age began with a double big bang. It was 1948 and the United States of America was continuing to invest heavily in high-tech research, the ?rst advantages of which had been reaped during the Second World War. In the Bell Telephone Laboratories, set up in New Jersey, to the south of New York, several teams were set up around brilliant researchers, manyofwhomhadbeentrainedatMIT(MassachusettsInstituteofTechnology). Thatyeartwoexceptionaldiscoveriesweremade, onetechnologicalandtheother theoretical, which were to mark the 20th century. For, a few months apart, and in the same institution John Bardeen, Walter Brattain and William Shockley invented the transistor while Claude Elwood Shannon established information and digital communications theory. This phenomenal coincidence saw the birth ofnear-twins: thesemi-conductorcomponentwhich, accordingtoits conduction state (on or o?), is able to materially represent binary information ("0" or "1") andtheShannon orbit (shortforbinaryunit), a unit that measuresinformation capacity. Today we can recognize the full importance of these two inventions that - abledthe tremendousexpansionofcomputing andtelecommunications, to name but these two. Since 1948, the meteoric progress of electronics, then of mic- electronics, has providedengineers and researchersin the world of telecommu- cations with a support for their innovations, in order to continually increase the performanceof their systems.

Spis treści

Digital communications.- Theoretical limits.- Block codes.- Convolutional codes and their decoding.- Concatenated codes.- Convolutional turbo codes.- Turbo product codes.- LDPC codes.- Turbo codes and large spectral efficiency transmissions.- The turbo principle applied to equalization and detection.

Blurb

This book is devoted to one of the essential functions of modern telecommunications systems: channel coding or error correction coding. At the crossroads of information theory, mathematics and electronics, channel coding has undergone many developments since Claude Shannon's founding work. From the simple Hamming code (1950) and LDPC codes (1962) to the more recent turbo codes (1993), channel coding has evolved considerably and has incorporated ever more sophisticated concepts, especially the probabilistic processing of information.

The book's main topic is iteratively decoded  algebraic codes, convolutional codes and concatenated codes, and it also presents digital modulation with which channel coding is closely associated to make up the heart of the physical layer of telecommunications systems. The most important theoretical aspects are given, and the building of codes is detailed and justified. Decoding algorithms are developed and, whenever possible, accompanied by simulation results characteristic of their correcting power.

The authors are researchers and lecturers recognised for their expertise in the field of encoding and decoding algorithms and associated circuits. Codes and Turbo Codes is intended both as a means for discovering the domain, a valuable source of information about the many techniques imagined since the mid-twentieth century, and as a step towards addressing  problems not yet entirely solved.