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A nonbinary LDPC-coded four-dimensional rotated QAM constellation scheme in Rayleigh fading channel

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Abstract

In this paper, a nonbinary (NB) LDPC-coded four-dimensional (4-D) rotated quadrature amplitude modulation (QAM) constellation scheme in Rayleigh fading channel is proposed. The optimal rotated angle of 16QAM constellation is obtained by exhaustive search. Compared with the conventional 16QAM constellation without rotation in Rayleigh fading channel, the proposed 4-D rotated 16QAM constellation scheme can obtain diversity gain. When spectral efficiency (SE) is 3.20 bits/s/Hz, compared with the regular 16QAM constellation system, the proposed 4-D rotated 16QAM constellation scheme can obtain 1.00 dB theoretical gain, while the simulated error performance gain of the proposed GF(256) LDPC-coded 4-D rotated 16QAM constellation scheme is 1.08 dB. When SE is 3.333 bits/s/Hz, compared with the regular 16QAM constellation system, the proposed 4-D rotated 16QAM constellation scheme can get 1.28 dB theoretical gain, while the simulated error performance gain of the proposed GF(256) LDPC-coded 4-D rotated 16QAM constellation scheme is 1.28 dB. Both the theoretical average mutual information analysis and simulated error performance show that the proposed scheme is efficient and reliable, which is suitable for the future ultra-high-reliable communications.

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The data used or analysed during the current study are available from the corresponding author on reasonable request.

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Funding

This work was supported by Fundamental Research Program of Shanxi Province (202203021212159, 20210302123208).

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  1. School of Information and Communication Engineering, North University of China, Taiyuan, 030051, China

    Weimin Kang

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  1. Weimin Kang
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Weimin Kang wrote the main manuscript and prepared all the work and reviewed the manuscript.

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Correspondence to Weimin Kang.

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Kang, W. A nonbinary LDPC-coded four-dimensional rotated QAM constellation scheme in Rayleigh fading channel. SIViP 18, 2059–2063 (2024). https://doi.org/10.1007/s11760-023-02841-3

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  • DOI: https://doi.org/10.1007/s11760-023-02841-3

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