Adaptive spatial-layout selection for massive multi-color visible light communications

Zhang Yumeng; Zhu Yi-Jun; Zhang Yan-Yu; Chao Wang

摘要

Massive multi-color visible light communications (mMC-VLC) sufficiently utilizing space and color domain resources is proposed to satisfy high-spectral-efficiency, high-speed, and high-density-coverage requirements of next-generation indoor data connections. However, the gap between the number of LEDs and photodiodes (PDs) and the high correlation among different channels limit the multiplexing of mMC-VLC. Also, the mobility of the receiver is the bottleneck of mMC-VLC. So, adaptive spatial-layout selection (ASLS) is proposed to settle the above problems, which selects N sets n-color LEDs from the transmitter to form an approximate optimal closed-circle layout adapting to the receiver position. First, the optimal parameter problems to minimize the ill condition of the activated system under layout constraints of the closed circle and linear types are formulated for a fixed receiver position. Second, to achieve adaptivity, the fitting curves of the optimal layout parameter and D-v under both constraints are researched; D-v is the vertical distance between the transmitter and receiver planes. Finally, the closest layout-selected principle (CLSP) is proposed to solve the problem of the LEDs perhaps not perfectly forming the optimal parameter layout for mMC-VLC. The bit-error ratio (BER) performances and application scopes of ASLS under both layout constraints are compared to determine that the constraint layout is a closed circle; meanwhile the available maximal N corresponding to the receiver position is obtained. The optimal parameter of ASLS is linearly related to the receiver position and not related to N. The ASLS always achieves better BER performance than optical multi-stream spatial modulation. (C) 2019 Optical Society of America

机译：提出了充分利用空间和彩色域资源的大规模多色可见光通信（MMC-VLC）以满足下一代室内数据连接的高光谱效率，高速和高密度 - 覆盖要求。然而，LED和光电二极管（PDS）的数量与不同通道之间的高相关之间的间隙限制了MMC-VLC的复用。而且，接收器的移动性是MMC-VLC的瓶颈。因此，提出了自适应空间布局选择（ASL）来解决上述问题，该问题选择N设置来自发射机的N颜色LED，以形成适应接收器位置的近似最佳闭合圆布局。首先，为固定接收器位置配制以在闭合圆和线性类型的布局限制下最小化激活系统的不良状态的最佳参数问题。其次，为了实现适应性，研究了在两个约束下的最佳布局参数和D-V的拟合曲线; D-V是发射器和接收器平面之间的垂直距离。最后，提出了最接近的布局选择的原理（CLSP）来解决LED的问题可能不完美地形成MMC-VLC的最佳参数布局。比较两个布局约束下ASL的误码率（BER）性能和应用范围以确定约束布局是闭合圆圈;同时获得对应于接收器位置的可用最大值N. ASL的最佳参数与接收器位置线性相关，并且与N. ASL始终实现比光学多流空间调制更好的BER性能。（c）2019年光学学会

Adaptive spatial-layout selection for massive multi-color visible light communications

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