Look-Up Table Based Low Complexity LLR Calculation for High-Order Amplitude Phase Shift Keying Signals

Nan WU; Chaoxing YAN; Jingming KUANG; Hua WANG

doi:10.1587/transcom.E95.B.2936

Look-Up Table Based Low Complexity LLR Calculation for High-Order Amplitude Phase Shift Keying Signals

Nan WU, Chaoxing YAN, Jingming KUANG, Hua WANG

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A low complexity log-likelihood ratio (LLR) calculation for high-order amplitude phase shift keying (APSK) signals is proposed. Using proper constellation partitioning together with a look-up table, the number of terms for the comparison of Euclidean distances can be significantly reduced. Compared with the log-sum LLR approximation, the proposed method reduces the computational complexity by more than 65% and 75% for 16-APSK and 32-APSK signals, respectively, with very small bit error rate performance degradation.

Publication: IEICE TRANSACTIONS on Communications Vol.E95-B No.9 pp.2936-2938

Publication Date: 2012/09/01

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Online ISSN: 1745-1345

DOI: 10.1587/transcom.E95.B.2936

Type of Manuscript: LETTER

Category: Transmission Systems and Transmission Equipment for Communications

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Nan WU, Chaoxing YAN, Jingming KUANG, Hua WANG, "Look-Up Table Based Low Complexity LLR Calculation for High-Order Amplitude Phase Shift Keying Signals" in IEICE TRANSACTIONS on Communications, vol. E95-B, no. 9, pp. 2936-2938, September 2012, doi: 10.1587/transcom.E95.B.2936.
Abstract: A low complexity log-likelihood ratio (LLR) calculation for high-order amplitude phase shift keying (APSK) signals is proposed. Using proper constellation partitioning together with a look-up table, the number of terms for the comparison of Euclidean distances can be significantly reduced. Compared with the log-sum LLR approximation, the proposed method reduces the computational complexity by more than 65% and 75% for 16-APSK and 32-APSK signals, respectively, with very small bit error rate performance degradation.
URL: https://globals.ieice.org/en_transactions/communications/10.1587/transcom.E95.B.2936/_p

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@ARTICLE{e95-b_9_2936,
author={Nan WU, Chaoxing YAN, Jingming KUANG, Hua WANG, },
journal={IEICE TRANSACTIONS on Communications},
title={Look-Up Table Based Low Complexity LLR Calculation for High-Order Amplitude Phase Shift Keying Signals},
year={2012},
volume={E95-B},
number={9},
pages={2936-2938},
abstract={A low complexity log-likelihood ratio (LLR) calculation for high-order amplitude phase shift keying (APSK) signals is proposed. Using proper constellation partitioning together with a look-up table, the number of terms for the comparison of Euclidean distances can be significantly reduced. Compared with the log-sum LLR approximation, the proposed method reduces the computational complexity by more than 65% and 75% for 16-APSK and 32-APSK signals, respectively, with very small bit error rate performance degradation.},
keywords={},
doi={10.1587/transcom.E95.B.2936},
ISSN={1745-1345},
month={September},}

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TY - JOUR
TI - Look-Up Table Based Low Complexity LLR Calculation for High-Order Amplitude Phase Shift Keying Signals
T2 - IEICE TRANSACTIONS on Communications
SP - 2936
EP - 2938
AU - Nan WU
AU - Chaoxing YAN
AU - Jingming KUANG
AU - Hua WANG
PY - 2012
DO - 10.1587/transcom.E95.B.2936
JO - IEICE TRANSACTIONS on Communications
SN - 1745-1345
VL - E95-B
IS - 9
JA - IEICE TRANSACTIONS on Communications
Y1 - September 2012
AB - A low complexity log-likelihood ratio (LLR) calculation for high-order amplitude phase shift keying (APSK) signals is proposed. Using proper constellation partitioning together with a look-up table, the number of terms for the comparison of Euclidean distances can be significantly reduced. Compared with the log-sum LLR approximation, the proposed method reduces the computational complexity by more than 65% and 75% for 16-APSK and 32-APSK signals, respectively, with very small bit error rate performance degradation.
ER -