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为了实现白光LED室内照明以及通信的双重功能,根据可见光通信的特点,在分析开关键控调制(OOK)、脉冲位置调制(PPM)、数字脉冲间隔调制(DPIM)以及双头脉冲间隔调制(DH-PIM)结构的基础上,提出一种新型反向双头脉冲间隔调制(RDH-PIM)方式。分析比较了各种调制方式的编码结构、带宽需求以及平均发射功率,推导了系统误时隙率表达式。仿真结果表明,OOK具有最小的带宽需求,RDH-PIM可以获得最大的平均发射功率,且带宽利用率明显优于PPM和DPIM。作为一种折中的调制方式,RDH-PIM在无线光通信中有一定的应用价值。
In order to realize the dual functions of white LED indoor lighting and communication, according to the characteristics of visible light communication, the key technologies of OOK, PPM, DPIM and DH -PIM) structure, a new type of reverse double-headed pulse interval modulation (RDH-PIM) is proposed. The encoding structure, bandwidth requirement and average transmit power of various modulation schemes are analyzed and compared, and the expression of the system error slot rate is deduced. The simulation results show that OOK has the minimum bandwidth requirement, RDH-PIM can obtain the maximum average transmit power, and the bandwidth utilization rate is obviously better than PPM and DPIM. As a compromise modulation method, RDH-PIM has certain application value in wireless optical communication.