Improved spatially-coupled multiuser transmission via constellation rotation

Spatial coupling has been applied in multiple access system in order to obtain higher spectral efficiency, where different users share the same resource blocks by superimposing data streams with different time offsets. In this paper, we introduce constellation rotation into the spatially-coupled mul...

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Bibliographic Details
Published in2017 IEEE 28th Annual International Symposium on Personal, Indoor, and Mobile Radio Communications (PIMRC) pp. 1 - 6
Main Authors Jiang, Min, Si, Zhongwei
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.10.2017
Subjects
Couplings
Decoding
Iterative decoding
Modulation
Mutual information
NOMA
Optimization
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Summary:Spatial coupling has been applied in multiple access system in order to obtain higher spectral efficiency, where different users share the same resource blocks by superimposing data streams with different time offsets. In this paper, we introduce constellation rotation into the spatially-coupled multiuser system to further distinguish users and mitigate the interferences. The optimization of the rotation angles is carried out by maximizing the average mutual information between the transmitted symbols and the received signal. Simulation results show that the constellation rotation generally contributes to the performance improvement of the system and reduces the decoding latency. Benefiting from the optimization, the system with the optimal rotation angle set clearly outperforms the others.
ISBN:1538635291
9781538635292
ISSN:2166-9589
DOI:10.1109/PIMRC.2017.8292763