Phase-Aligned Complex Linear Physical-Layer Network Coding in OFDM-VLC Two-Way Relay Network
Phase-Aligned Complex Linear Physical-Layer Network Coding in OFDM-VLC Two-Way Relay Network
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DOI：
10.1109/lpt.2023.3265971
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发表时间：
2023-06
影响因子：
2.6
通讯作者：
G. Wei;S. Deng;Jian Zhao
中科院分区：
文献类型：
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作者：
G. Wei;S. Deng;Jian Zhao
提出并实验验证了正交频分复用（OFDM）可见光通信（VLC）双向中继网络（TWRN）中相位对准复线性物理层网络编码（PA-CLPNC）方案。该方案基于高斯整数的有限域，实现了高阶QAM的PNC，减小了中继站叠加信号的星座尺寸，并将其广播回用户。我们进一步采用相位对齐策略，以提高类之间的最小欧氏距离，其中叠加信号的星座点在中继分类。VLC-TWRN的实验表明，与传统的放大转发PNC方案相比，该方案的误码率降低了1 ~ 2个数量级，吞吐量为600 Mbit/s ~ 1.47Gbit/s，采用均匀8 QAM/16 QAM OFDM或比特功率加载。
We propose and experimentally demonstrate a phase-aligned complex linear physical-layer network coding (PA-CLPNC) scheme in orthogonal frequency division multiplexing (OFDM) visible light communication (VLC) two-way relay network (TWRN). The proposed scheme, based on the finite field of the Gaussian integer, achieves PNC of high-order QAMs and reduces the constellation size of the superposed signal at the relay before broadcasting it back to users. We further adopt a phase alignment strategy to enhance the minimum Euclidean distance between classes, into which the constellation points of the superposed signal at the relay are categorized. VLC-TWRN experiments with throughput of 600Mbit/s-1.47Gbit/s, using either uniform 8QAM/16QAM OFDM or bit-and-power loading, show that the proposed PA-CLPNC achieves one to two orders of magnitude reduction in the bit error ratio compared to the conventional amplify-and-forward PNC scheme.