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提出了一种基于副载波复用的新型的多输入单输出(MISO)正交频分复用可见光通信(OFDM-VLC)系统构架,并且实验验证了2×1和3×1的MISO OFDM-VLC系统传输。分别测量了2×1和3×1的实验系统的误差矢量幅度(EVM)随输入电压变化的曲线图,找出了两个系统各自的最佳偏置范围。在将输入电压设置在最佳偏置范围之内的情况下,改变传输距离,对2×1系统,给出了系统EVM性能变化的曲线图;对3×1系统,给出了系统EVM和误码率(BER)性能变化的曲线图。在没有任何均衡的情况下,两个系统的传输距离都可以长达140cm。
A novel MISO Orthogonal Frequency Division Multiplexing (OFDM-VLC) system architecture based on subcarrier multiplexing is proposed, and the experimental verification of 2 × 1 and 3 × 1 MISO OFDM- VLC system transmission. The optimal bias range of the two systems was found out from the curves of the error vector magnitude (EVM) of 2 × 1 and 3 × 1 experimental systems with the input voltage. When the input voltage is set within the optimal bias range, the transmission distance is changed, and for the 2 × 1 system, a graph of the performance of the system EVM is given. For the 3 × 1 system, the system EVM and Curve of bit error rate (BER) performance changes. Without any balance, the distance between the two systems can be as long as 140cm.