A conceptual framework for understanding turbo codes

Battail, Gérard

doi:10.1109/49.661112

Cited by 49 publications

(36 citation statements)

References 19 publications

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“…It should be kept in mind that, as far as capacity-achieving codes are concerned, the minimum Euclidean distance has little relevance: it is the whole distance spectrum that counts [414]. This is classically demonstrated by the features of turbo codes [359], which exhibit a relatively poor minimum distance and yet approach capacity rather remarkably.…”

Section: Designing Fading Codes: the Impact Of Hamming Distancementioning

confidence: 99%

Fading channels: information-theoretic and communications aspects

Biglieri

Proakis

Shamai³

1998

IEEE Trans. Inform. Theory

1,672

1,342

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Abstract-In this paper we review the most peculiar and interesting information-theoretic and communications features of fading channels. We first describe the statistical models of fading channels which are frequently used in the analysis and design of communication systems. Next, we focus on the information theory of fading channels, by emphasizing capacity as the most important performance measure. Both single-user and multiuser transmission are examined. Further, we describe how the structure of fading channels impacts code design, and finally overview equalization of fading multipath channels.

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Section: Designing Fading Codes: the Impact Of Hamming Distancementioning

confidence: 99%

Fading channels: information-theoretic and communications aspects

Biglieri

Proakis

Shamai³

1998

IEEE Trans. Inform. Theory

1,672

1,342

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“…Interleaving introduces the random component necessary for good coding schemes, as stated by the principles of information theory [33]. Although a lot of research has been carried out regarding design of good interleavers.…”

Section: Collision-free Interleaver Designmentioning

confidence: 99%

Turbo Coding for 4G Systems: Design Issues and Solutions

Giulietti¹,

Strum²,

Bougard³

et al. 2003

Journal of Communication and Information Systems

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-After the initial interest caused by the appearance of turbo codes in 1993. special attention on the implementation has Jed to their adoption in some of the most important 3G standards. However. future broadband systems (with data rates up to 155 Mbis) still require a better speed/latency/power performance than those found in current implementations. This paper discusses several design aspects of a broadband. low-power turbo codec owning features that enable its application in the incoming decade systems. The presented ideas were applied to an 80 Mb/s, 2 nJ/bit turbo codec core with latency smaller than 10ms. This flexible architecture allows re-scaling towards faster low power implementations (beyond I Gb/s).Keywords: Turbo codes. VLSI. low-power. broadband. Resumo -Ap6s 0 interesse inicial causado pelo surgimento dos c6digos turbo em 1993. uma atencao especial para a implernentacao levou a sua utilizacao em alguns dos mais importantes padroes 3G. Entretanto. os futuros sistemas de faixa larga (com taxas de dados de ate 155Mb/s) requerem um desempenho de velocidade/latencia/potencia ainda melhor do que aquele encontrado nas atuais implementacoes. Esse artigo discute diversos aspectos de projeto de um codec turbo de baixa potencia cujas caracteristicas possibilitam a sua aplicacao nos sistemas da proxima decada, As ideias apresentadas foram aplicadas a urn codec turbo operando a 80 Mb/s e 2nJ/bit com latencia menor do que lOms. Essa arquitetura Hexi vel permite reescalonamento. na direcao de se ter implernentacoes de mais baixa poiencia e mais rapidas (acima de I Gb/s).Palavras-chave: C6digos turbo, VLSL baixa potencia, faixa larga.

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“…SPCPC has the same basic features of turbo codes: interleaving, iteration and soft-output decoding [2]. Rankin presented a soft input, soft output-based decoding algorithm for SPCPC [3].…”

Section: Introductionmentioning

confidence: 99%

Differentiated assignment of extrinsic information based on code weights of single parity check product code

Bong

Kim

2014

16th International Conference on Advanced Communication Technology

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Abstract-Constant amplitude multi-code CDMA (CAMC) removes the amplitude fluctuation in multi-code CDMA, by which the large power consumption of a power amplifier with a strict linearity can be avoided. The nature of CAMC is a recursive single parity check product code (SPCPC). CAMC for N = 4 k is equivalent to k-dim SPCPC. As a top-level CAMC codeword is recursively constructed from lower-level codewords, log likelihood ratio (LLR), a priori information (API) and extrinsic information (EI) of upper-level codewords are obtained as a function lowerlevel codewords. The codewords of CAMC were found to have fixed code weights, (N ± √ N )/2. In this paper, we show that differentiated assignment of EI in the iterated decoding can boost the BER performance. If any of the lower-level codewords have weights other than the fixed value, the EI associated with these erroneous lower-level codewords has lower confidence. EI from a wrong codeword is given lower weights in the computation of LLR, API and EI of the upper-level codeword. With differentiated assignment of EI, the BER performance improved by 0.1∼0.3 dB.

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A conceptual framework for understanding turbo codes

Cited by 49 publications

References 19 publications

Fading channels: information-theoretic and communications aspects

Fading channels: information-theoretic and communications aspects

Turbo Coding for 4G Systems: Design Issues and Solutions

Differentiated assignment of extrinsic information based on code weights of single parity check product code

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