Due to limited interference range, the advantage of visible light communication (VLC) over wireless fidelity (WiFi) lies more in the unit-area transmission rate rather than the single-link transmission rate. To characterize the achievable transmission rate per unit area, we consider an indoor downlink VLC network with dense attocell configuration for the transmitters with single-color light-emitting diode (LED) and multi-color LEDs, assuming binomial distributed users. We divide each attocell into central region and boundary region, and propose the transmission protocols based on such attocell division. We optimize the LED half-power angle to maximize the mean achievable transmission rate per unit area. More specifically, we investigate the rates of cell-center and cell-boundary users under fairness consideration for the single LED transmitter system. We characterize the mean achievable transmission rate per unit area under the white light constraints in the multiple LEDs transmitter system. The performance of the proposed transmission protocols is evaluated by numerical results.

中文翻译：

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LED半功率角优化，用于超密集室内可见光通信网络的部署

由于受限的干扰范围，可见光通信（VLC）优于无线保真（WiFi）的优势更多在于单位区域传输速率，而不是单链路传输速率。为了表征可实现的每单位面积的传输速率，我们假设具有二元分布用户的单色发光二极管（LED）和多色LED发射器的attocell配置密集的室内下行VLC网络。我们将每个attocell划分为中心区域和边界区域，并提出基于这种attocell划分的传输协议。我们优化了LED的半功率角，以最大程度地提高单位面积的平均透射率。进一步来说，我们研究了单个LED发射器系统在公平考虑下的小区中心和小区边界用户的速率。我们表征了在多个LED发射器系统中白光约束下每单位面积可实现的平均传输速率。数值结果评估了所提出的传输协议的性能。