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A universal low-complexity symbol-to-bit soft demapper

A universal low-complexity symbol-to-bit soft demapper
A universal low-complexity symbol-to-bit soft demapper
High-order constellations are commonly used for achieving high bandwidth efficiency in most communication systems. However, the complexity of the multiplication operations associated with the standard max-sum approximation of the maximum a posteriori probability in the log-domain (Max-Log-MAP) symbol-to-bit demapper is very high. In this contribution, we conceive a low-complexity universal soft demapper, which reduces the demapper’s complexity considerably for the binary-reflected Gray-labeled pulse amplitude modulation (PAM), phase shift keying (PSK), quadrature amplitude modulation (QAM), and amplitude phase-shift keying (APSK) relying on product constellation labeling (product-APSK). Our theoretical analysis demonstrates that the proposed demapper has exactly the same performance as the Max-Log-MAP demapper for the Gray-labeled PAM, PSK, and QAM. Our theoretical analysis and simulation results also demonstrate that for the Gray-labeled product-APSK, the performance degradation of the proposed simplified soft demapper is negligible for both 64-ary and 256-ary constellations compared with the Max-Log-MAP demapper.
0018-9545
119-130
Wang, Qi
ddfc62a2-708c-43b1-8eed-d68d4e87d96a
Xie, Qiuliang
e53ef0f5-d9bf-4002-b089-a04ad36bc6f0
Wang, Zhaocheng
70339538-3970-4094-bcfc-1b5111dfd8b4
Chen, Sheng
9310a111-f79a-48b8-98c7-383ca93cbb80
Hanzo, Lajos
66e7266f-3066-4fc0-8391-e000acce71a1
Wang, Qi
ddfc62a2-708c-43b1-8eed-d68d4e87d96a
Xie, Qiuliang
e53ef0f5-d9bf-4002-b089-a04ad36bc6f0
Wang, Zhaocheng
70339538-3970-4094-bcfc-1b5111dfd8b4
Chen, Sheng
9310a111-f79a-48b8-98c7-383ca93cbb80
Hanzo, Lajos
66e7266f-3066-4fc0-8391-e000acce71a1

Wang, Qi, Xie, Qiuliang, Wang, Zhaocheng, Chen, Sheng and Hanzo, Lajos (2014) A universal low-complexity symbol-to-bit soft demapper. IEEE Transactions on Vehicular Technology, 63 (1), 119-130.

Record type: Article

Abstract

High-order constellations are commonly used for achieving high bandwidth efficiency in most communication systems. However, the complexity of the multiplication operations associated with the standard max-sum approximation of the maximum a posteriori probability in the log-domain (Max-Log-MAP) symbol-to-bit demapper is very high. In this contribution, we conceive a low-complexity universal soft demapper, which reduces the demapper’s complexity considerably for the binary-reflected Gray-labeled pulse amplitude modulation (PAM), phase shift keying (PSK), quadrature amplitude modulation (QAM), and amplitude phase-shift keying (APSK) relying on product constellation labeling (product-APSK). Our theoretical analysis demonstrates that the proposed demapper has exactly the same performance as the Max-Log-MAP demapper for the Gray-labeled PAM, PSK, and QAM. Our theoretical analysis and simulation results also demonstrate that for the Gray-labeled product-APSK, the performance degradation of the proposed simplified soft demapper is negligible for both 64-ary and 256-ary constellations compared with the Max-Log-MAP demapper.

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More information

Published date: January 2014
Organisations: Southampton Wireless Group

Identifiers

Local EPrints ID: 354719
URI: http://eprints.soton.ac.uk/id/eprint/354719
ISSN: 0018-9545
PURE UUID: 1ebf478d-7733-4257-8246-8fde88425b5f
ORCID for Lajos Hanzo: ORCID iD orcid.org/0000-0002-2636-5214

Catalogue record

Date deposited: 17 Jul 2013 21:17
Last modified: 12 Nov 2019 02:04

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