A new LLR approximation for BICM systems with HARQ

Jin Whan Kang; Sang Hyo Kim; Seokho Yoon; Taehee Han; Hyoung Kee Choi

doi:10.1587/transcom.E93.B.1628

A new LLR approximation for BICM systems with HARQ

Jin Whan Kang, Sang Hyo Kim, Seokho Yoon, Taehee Han, Hyoung Kee Choi

Department of Electronic and Electrical Engineering

Sungkyunkwan University

Research output: Contribution to journal › Article › peer-review

Abstract

In this letter, a new approximation of log-likelihood ratio (LLR) for soft input channel decoding is proposed. Conventional simplified LLR using log-sum approximation can degrade the performance of bit interleaved coded modulation (BICM) systems employing hybrid automatic repeat request (HARQ) at low SNR. The proposed LLR performs as well as the exact LLR, and at the same time, requires only a small number of elementary operations.

Original language	English
Pages (from-to)	1628-1632
Number of pages	5
Journal	IEICE Transactions on Communications
Volume	E93-B
Issue number	6
DOIs	https://doi.org/10.1587/transcom.E93.B.1628
State	Published - Jun 2010

Keywords

BICM
Demapper
HARQ
Log-likelihood ratio
QAM

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10.1587/transcom.E93.B.1628

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abstract = "In this letter, a new approximation of log-likelihood ratio (LLR) for soft input channel decoding is proposed. Conventional simplified LLR using log-sum approximation can degrade the performance of bit interleaved coded modulation (BICM) systems employing hybrid automatic repeat request (HARQ) at low SNR. The proposed LLR performs as well as the exact LLR, and at the same time, requires only a small number of elementary operations.",

keywords = "BICM, Demapper, HARQ, Log-likelihood ratio, QAM",

author = "Kang, \{Jin Whan\} and Kim, \{Sang Hyo\} and Seokho Yoon and Taehee Han and Choi, \{Hyoung Kee\}",

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AU - Kang, Jin Whan

AU - Kim, Sang Hyo

AU - Yoon, Seokho

AU - Han, Taehee

AU - Choi, Hyoung Kee

PY - 2010/6

Y1 - 2010/6

N2 - In this letter, a new approximation of log-likelihood ratio (LLR) for soft input channel decoding is proposed. Conventional simplified LLR using log-sum approximation can degrade the performance of bit interleaved coded modulation (BICM) systems employing hybrid automatic repeat request (HARQ) at low SNR. The proposed LLR performs as well as the exact LLR, and at the same time, requires only a small number of elementary operations.

AB - In this letter, a new approximation of log-likelihood ratio (LLR) for soft input channel decoding is proposed. Conventional simplified LLR using log-sum approximation can degrade the performance of bit interleaved coded modulation (BICM) systems employing hybrid automatic repeat request (HARQ) at low SNR. The proposed LLR performs as well as the exact LLR, and at the same time, requires only a small number of elementary operations.

KW - BICM

KW - Demapper

KW - HARQ

KW - Log-likelihood ratio

KW - QAM

UR - https://www.scopus.com/pages/publications/77953005277

U2 - 10.1587/transcom.E93.B.1628

DO - 10.1587/transcom.E93.B.1628

M3 - Article

AN - SCOPUS:77953005277

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VL - E93-B

SP - 1628

EP - 1632

JO - IEICE Transactions on Communications

JF - IEICE Transactions on Communications

IS - 6

ER -

A new LLR approximation for BICM systems with HARQ

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Keywords

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