Semi-iterative Analogue Turbo Decoding

Semi-iterative Analogue Turbo Decoding
Author: Matthieu Arzel
Publisher:
Total Pages: 152
Release: 2006
Genre:
ISBN:
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Over the past decade, telecommunication systems have dramatically grown providing services which require ever more data rate with ever more mobility. To sustain this growth, enhanced and new techniques were implemented in ever more optimised digital circuits. A novel approach could be soon necessary for some of these techniques, due to the limitations of their hardware implementations. Error correction is one of them. It allows to reduce the energy used to send information, but, when implemented on a chip, it is a bottleneck in terms of data throughput and of, paradoxically, power consumption. The analogue iterative decoding could solve this problem. This technique, promising high performance, requires new architectures and codes adapted to the constraints of analogue processing to challenge digital circuits in the field of industrial applications. A novel architecture and a novel turbo decoding algorithm, offering a good compromise between onchip area and data rate, are proposed in this thesis. They pave the way for integrating flexible high-speed analogue turbo decoders dealing with different frame lengths ranging from a few dozen to a few thousand bits. The new architecture and decoding algorithm are applied to a DVB-RCS-like code. The component 8-state decoder used in this new architecture was designed for a 0.25μm BiCMOS process. Dealing with frames made up of 24 double-binary symbols, it is, up to this date, one of the most complex analogue decoders ever designed. Implemented on chip, the circuit was successfully tested at 100Mbit/s while consuming 414mW on a 2.8V analogue core supply. It was shown to provide a bit error rate as close as 0.3dB to the digital one.

Turbo-like Codes

Turbo-like Codes
Author: Aliazam Abbasfar
Publisher: Springer Science & Business Media
Total Pages: 94
Release: 2007-09-09
Genre: Technology & Engineering
ISBN: 1402063911
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This book introduces turbo error correcting concept in a simple language, including a general theory and the algorithms for decoding turbo-like code. It presents a unified framework for the design and analysis of turbo codes and LDPC codes and their decoding algorithms. A major focus is on high speed turbo decoding, which targets applications with data rates of several hundred million bits per second (Mbps).

Turbo Coding, Turbo Equalisation and Space-Time Coding for Transmission over Fading Channels

Turbo Coding, Turbo Equalisation and Space-Time Coding for Transmission over Fading Channels
Author: Lajos L. Hanzo
Publisher: Wiley-IEEE Press
Total Pages: 766
Release: 2002-09-09
Genre: Technology & Engineering
ISBN: 9780470847268
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Turbo coding has opened an exciting new chapter in the design of iterative detection assisted communication systems. Similar dramatic advances have been achieved with the advent of space time coding, when communicating over dispersive fading wireless channels. By assuming no prior knowledge in the field of channel coding, the authors provide a self-contained reference on these stimulating hot topics, concluding at an advanced level. This essential volume is divided into five key parts: 1. Convolutional and Block Coding Introduces the family of convolutional codes, hard and soft-decision Viterbi algorithms and the most prominent classes of block codes, namely Reed-Solomon (RS) and Bose-Chaudhuri-Hocquenghem (BCH) codes, as well as their algebraic and trellis-decoding. 2. Turbo Convolutional and Turbo Block Coding Introduces turbo convolutional codes and details the Maximum A-Posteriori (MAP), Log-MAP and Max-Log-MAP as well as the Soft Output Viterbi Algorithm (SOVA). Investigates the effects of the various turbo codec parameters. Studies the super-trellis structure of turbo codes and characterises turbo BCH codes. Portrays Redundant Residue Number System (RRNS) based codes and their turbo decoding. 3. Coded Modulation: TCM, TTCM, BICM, BICM-ID Studies Trellis Coded Modulation (TCM), Turbo Trellis Coded Modulation (TTCM), Bit-Interleaved Coded Modulation (BICM), Iterative BICM (BICM-ID) and compares them under various channel conditions. 4. Space-Time Block and Space-Time Trellis Coding Introduces space-time codes and studies their performance using numerous channel codecs providing guidelines for system designers. Studies Multiple-Input Multiple-Output (MIMO) based schemes and the concept of near-instantaneously Adaptive Quadrature Amplitude Modulation (AQAM) combined with near-instantaneously adaptive turbo channel coding. 5. Turbo Equalisation Covers the principle in detail, provides theoretical performance bounds for turbo equalisers and includes a study of various turbo equaliser arrangements. Also addresses the problem of reduced implementation complexity and covers turbo equalised space-time trellis codes. If you are looking for a comprehensive treatment covering both classic channel coding techniques and recent advances in this field, then this is the book for you. Researchers, practising engineers and advanced students will all find it both informative and stimulating.

Turbo Decoder Architecture for Beyond-4G Applications

Turbo Decoder Architecture for Beyond-4G Applications
Author: Cheng-Chi Wong
Publisher: Springer Science & Business Media
Total Pages: 106
Release: 2013-10-01
Genre: Technology & Engineering
ISBN: 1461483107
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This book describes the most recent techniques for turbo decoder implementation, especially for 4G and beyond 4G applications. The authors reveal techniques for the design of high-throughput decoders for future telecommunication systems, enabling designers to reduce hardware cost and shorten processing time. Coverage includes an explanation of VLSI implementation of the turbo decoder, from basic functional units to advanced parallel architecture. The authors discuss both hardware architecture techniques and experimental results, showing the variations in area/throughput/performance with respect to several techniques. This book also illustrates turbo decoders for 3GPP-LTE/LTE-A and IEEE 802.16e/m standards, which provide a low-complexity but high-flexibility circuit structure to support these standards in multiple parallel modes. Moreover, some solutions that can overcome the limitation upon the speedup of parallel architecture by modification to turbo codec are presented here. Compared to the traditional designs, these methods can lead to at most 33% gain in throughput with similar performance and similar cost.

Channel Coding: Theory, Algorithms, and Applications

Channel Coding: Theory, Algorithms, and Applications
Author:
Publisher: Academic Press
Total Pages: 687
Release: 2014-07-29
Genre: Technology & Engineering
ISBN: 012397223X
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This book gives a review of the principles, methods and techniques of important and emerging research topics and technologies in Channel Coding, including theory, algorithms, and applications. Edited by leading people in the field who, through their reputation, have been able to commission experts to write on a particular topic. With this reference source you will: - Quickly grasp a new area of research - Understand the underlying principles of a topic and its applications - Ascertain how a topic relates to other areas and learn of the research issues yet to be resolved - Quick tutorial reviews of important and emerging topics of research in Channel Coding - Presents core principles in Channel Coding theory and shows their applications - Reference content on core principles, technologies, algorithms and applications - Comprehensive references to journal articles and other literature on which to build further, more specific and detailed knowledge

Iterative Detection

Iterative Detection
Author: Keith Chugg
Publisher: Springer Science & Business Media
Total Pages: 394
Release: 2001
Genre: Computers
ISBN: 9780792372776
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Iterative Detection: Adaptivity, Complexity Reduction, and Applications is a primary resource for both researchers and teachers in the field of communication. Unlike other books in the area, it presents a general view of iterative detection that does not rely heavily on coding theory or graph theory. The features of the text include: Both theoretical background and numerous real-world applications. Over 70 detailed examples, 100 problems, 180 illustrations, tables of notation and acronyms, and an extensive bibliography and subject index. A whole chapter devoted to a case study on turbo decoder design. Receiver design guidelines, rules and suggestions. The most advanced view of iterative (turbo) detection based only on block diagrams and standard detection and estimation theory. Development of adaptive iterative detection theory. Application of adaptive iterative detection to phase and channel tracking in turbo coded systems and systems representative of digital mobile radio designs. An entire chapter dedicated to complexity reduction. Numerous recent research results. Discussion of open problems at the end of each chapter. Among the applications considered in this book are joint equalization and decoding, turbo codes, multiuser detection and decoding, broadband wireless channel equalization, and applications to two-dimensional storage and imaging systems. Audience: Iterative Detection: Adaptivity, Complexity Reduction, and Applications provides an accessible and detailed reference for researchers, practicing engineers, and students working in the field of detection and estimation. It will be of particular interest to those who would like to learn how iterative detection can be applied to equalization, interference mitigation, and general signal processing tasks. Researchers and practicing engineers interested in learning the turbo decoding algorithm should also have this book.