| 室内可见光通信中的自适应STBC MIMO-OFDM系统设计 |
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| 引用本文： | 郭心悦,李双双,郭阳,肖江南.室内可见光通信中的自适应STBC MIMO-OFDM系统设计[J].红外与激光工程,2018,47(2):222001-0222001(8). |
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| 作者姓名： | 郭心悦 李双双 郭阳 肖江南 |
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| 作者单位： | 1.上海理工大学 光电信息与计算机工程学院 上海市现代光学系统重点实验室,上海 200093 |
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| 基金项目： | 国家自然科学基金青年科学基金（61501296） |
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| 摘 要： | 提出基于空时块码（STBC）调制的自适应多输入多输出正交频分复用（MIMO-OFDM）可见光通信（VLC）系统，该系统能够克服MIMO信道相关性并实现可靠通信。同时，引入功率比特分配（PBA）与OFDM相结合，以适应信道传输条件从而有效提高频谱效率。通过搭建一个22的MIMOOFDM VLC演示系统，实现了80 cm距离的传输，实验中测得的误码率始终保持在7%的前向纠错阈值3.810-3之下。实验结果表明，STBC MIMO-OFDM系统对MIMO信道相关性鲁棒，且PBA的应用能够大幅度提高数据速率。
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| 关 键 词： | 可见光通信 空时块码 多输入多输出正交频分复用 功率和比特分配 |
| 收稿时间： | 2017-08-05 |
Adaptive STBC MIMO-OFDM system design for indoor visible light communications |
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| Affiliation: | 1.Shanghai Key Lab of Modern Optical System,School of Optical-Electrical and Computing Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China |
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| Abstract: | An adaptive multiple-input multiple-output orthogonal frequency division multiplexing (MIMOOFDM) visible light communication(VLC) system based on space-time block coding (STBC) modulation was proposed in the paper, which can overcome the MIMO channel correlation and achieve reliable communications. Meanwhile, power-and-bit allocation(PBA) was combined with OFDM in order to adapt to the channel and improve the spectral efficiency. Then a 22 MIMO-OFDM VLC transmission over a distance of 80 cm was demonstrated, where the measured bit error rates were all below 7% of the pre-forward-error-correction threshold of 3.810-3. Experimental results show that the STBC MIMO-OFDM system is robust to MIMO channel correlation, where the data rates can be greatly improved by applying the PBA. |
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