针对室内照明场景应用需求, 探究了驱动电流的变化对四种常用LED光源频率特性所产生的影响效果, 得出荧光粉LED的频率特性响应几乎不受驱动电流变化的影响的结论。结合硬件预均衡策略对1 W荧光粉LED的调制带宽拓展进行了理论分析和硬件电路设计, 测试结果表明: 在不对蓝光过滤的条件下, 荧光粉LED调制带宽由1 MHz提高到了32 MHz, 单盏荧光粉LED在非归零-开关键控(non-return-to-zero on-off-keying, NRZ-OOK)调制下可达到26 Mbit/s的传输速率, 误码率7.55×10-6, 传输距离达到3 m, 符合于室内照明通信对传输距离的要求。

For the application requirements of the indoor lighting scenes, the effect on the frequency characteristics of four types common LEDs caused by the drive current fluctuations was researched, and the conclusion was that the frequency characteristic response of the phosphor LED was almost unaffected by the drive current variations. Combined with the hardware pre-equalization strategy, the theoretical analysis and the hardware circuit design to expand bandwidth of the 1 W phosphor LED were done. The experimental results prove that without the blue filter, the modulation bandwidth of the phosphor LED is increased from 1 MHz to 32 MHz, and 26 Mbit/s phosphor LED VLC covered 3 meters communiations distance using non-return-to-zero on-off-keying(NRZ-OOK)modulation is realized with bit error ratio of 7.55×10-6 , which meets the requirements of the transmission distance in indoor VLC system.