Performance enhanced dual-mode index modulation OFDM with OCT precoding in VLC systems

被引：8

作者：

Wen, Hong ^{[1
]}

Chen, Hao ^{[1
]}

Chen, Qinghui ^{[1
]}

Luo, Kunping ^{[1
]}

Chen, Ming ^{[2
]}

Liu, Fengnian ^{[1
]}

机构：

[1] Hunan Univ Technol, Coll Comp Sci, Zhuzhou 412007, Peoples R China

[2] Hunan Normal Univ, Sch Phys & Elect, Changsha 410081, Peoples R China

来源：

OPTICS COMMUNICATIONS | 2023年 / 530卷

关键词：

Visible light communication (VLC); Orthogonal frequency division multiplexing; (OFDM); Dual-mode index modulation; Orthogonal circulant matrix transform (OCT); precoding; SPREAD OFDM;

D O I：

10.1016/j.optcom.2022.129191

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

In this paper, dual-mode index modulation orthogonal frequency division multiplexing (DMIM-OFDM) enabled by orthogonal circulant matrix transform (OCT) precoding is proposed and experimentally demonstrated in visible light communication (VLC) systems. Since all available subcarriers are active to convey information bits, DMIM-OFDM can achieve higher spectral efficiency (SE) and energy efficiency (EE) than index modulation OFDM (IM-OFDM). In addition, to mitigate the uneven frequency-selective fading between different subblocks, channel-independent OCT precoding is applied to all subblocks to equalize the overall signal-to-noise ratio (SNR). The experimental results show that the DMIM-OFDM with OCT precoding outperforms the traditional IM-OFDM, DMIM-OFDM without precoding, and with DFT precoding at different SEs. For DMIM-OFDM VLC system with SE of 4.5 bit/s/Hz, by using OCT precoding, the receiver sensitivity improvement of 3 dB can be achieved at the bit error rate (BER) of 3.8e-3 after 3.5-m free-space transmission.

引用

页数：6

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