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 use white LED as a lighting source and communication part，a novel modulation scheme called reverse dual header pulse interval modulation (RDH- PIM) is proposed for indoor visible light communications based on the analysis of on- off keying (OOK)，pulse position modulation (PPM)，digital pulse position modulation(DPIM)，and dual header pulse interval modulation (DH- PIM). The symbol structure,bandwidth requirement and average transmit power are analyzed and compared, and the slot error rate is derived. The simulation results show that OOK has the minimum bandwidth, while RDH- PIM has the highest average transmit power and its bandwidth efficiency is notably better than PPM and DPIM. Hence, RDH-PIM is superior in the optical wireless communication system.