用于VLC的LED半功率角优化

[摘要] 提出通过优化发光二极管（LED）半功率角的布局来提高室内可见光通信系统性能的方法。4种典型的LED布局方式的仿真结果表明，该方法对于提高可见光通信系统的信噪比、降低信噪比的波动有明显效果。对于均匀的LED布局方式，信噪比的波动从未优化时的5.2 dB大幅下降到0.3 dB。该方法不需要调节LED的功率，更适合于工程运用。

[关键词] 可见光通信；发光二极管；优化布局

[Abstract] This paper describes a method for optimizing the semi-angle at half power (SAHP) of a LED in order to improve indoor visible light communication. Four typical LED alignments are studied. The simulation results show that the proposed method increases SNR and reduces its fluctuation. Especially in the case of evenly distributed LED alignment, SNR fluctuation reduces significantly—from 5.2 dB to 0.3 dB. A distinguishing feature of this method is that the same power is used for each LED, which makes this method feasible for practical applications.

[Keywords] visible light communication; light-emitting diodes; alignment optimization