In this paper, the multiple input and multiple output system (MIMO) is investigated to mitigate the inter-cell interference (ICI) in visible light communication (VLC). The interference due to light from neighbor cell deteriorates the channel capacity of the system. Therefore, a MIMO-based VLC system is employed to optimize the capacity especially in ICI areas of the room. In this paper, the capacity of 2x2, 3x3 and 4x4 MIMO systems is investigated and compared with the single input and single output (SISO) channel capacity without interference. The channel capacity improves by increasing the order of MIMO array and it deteriorates due to ICI. However, the effects of ICI are more severe at higher signal-to-noise ratio (SNR) especially at high interference areas. Therefore, the order of MIMO array is investigated at different SNRs in interference regions to achieve the interference-free capacity system. Simulation and theoretical results show that ICI is considerably mitigated by using MIMO system. The high SNR 42, 47 and 51.7 dB is achieved in ICI for 2x2, 3x3 and 4x4 MIMO system, respectively.
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机译：本文研究了多输入多输出系统（MIMO）以减轻可见光通信（VLC）中的单元间干扰（ICI）。来自相邻小区的光引起的干扰会降低系统的通道容量。因此，采用基于MIMO的VLC系统来优化容量，特别是在房间的ICI区域。本文研究了 2x2、3x3 和 4x4 MIMO 系统的容量，并与无干扰的单输入和单输出 （SISO） 信道容量进行了比较。信道容量通过增加MIMO阵列的阶数而提高，并且由于ICI而恶化。然而，在更高的信噪比 （SNR） 下，ICI 的影响更为严重，尤其是在高干扰区域。因此，研究了干扰区域不同信噪比下MIMO阵列的阶数，以实现无干扰容量系统。仿真和理论结果表明，使用MIMO系统可以显著降低ICI水平。ICI 在 2x2、3x3 和 4x4 MIMO 系统中分别实现了 42、47 和 51.7 dB 的高信噪比。
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