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

^*此作品的通讯作者

Beijing Institute of Technology

科研成果: 期刊稿件 › 文章 › 同行评审

2 引用（Scopus）

摘要

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.

源语言	英语
页（从-至）	2936-2938
页数	3
期刊	IEICE Transactions on Communications
卷	E95-B
期	9
DOI	https://doi.org/10.1587/transcom.E95.B.2936
出版状态	已出版 - 9月 2012

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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.",

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author = "Nan Wu and Chaoxing Yan and Jingming Kuang and Hua Wang",

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AU - Wu, Nan

AU - Yan, Chaoxing

AU - Kuang, Jingming

AU - Wang, Hua

PY - 2012/9

Y1 - 2012/9

N2 - 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.

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.

KW - APSK signals

KW - LDPC codes

KW - LLR calculation

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JF - IEICE Transactions on Communications

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Look-up table based low complexity LLR calculation for high-order amplitude phase shift keying signals

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