为了研究适用于室内无线光通信的调制方式，分析了开关键控(OOK)、脉冲位置调制(PPM)、差分脉冲位置调制(DPPM)、数字脉冲间隔调制(DPIM) 和双头脉冲间隔调制(DH-PIM)的调制结构，详细推导了各调制方式的平均发射功率、带宽需求、传输容量和误包率的公式，并进行了仿真分析。结果表明，PPM 的平均发射功率最小，DPIM、DPPM和DH-PIM次之，OOK的平均发射功率最大；OOK的带宽需求最小，DH-PIM、DPPM和DPIM次之，PPM的带宽需求最大；DPPM的传输容量 最大，DPIM和DH-PIM次之，OOK和PPM的传输容量最小；在相同调制阶数的条件下，PPM的误包率最小，DPIM、DPPM和DH-PIM次之，OOK的误包率最大。

In order to research modulation schemes suitable for indoor wireless optical communication, the modulation structures of five modulation schemes (OOK, PPM, DPPM, DPIM and DH-PIM) are analyzed, the equations of average transmitting power, bandwidth requirement, transmission capacity and packet error rate are derived in detail, and the simulation results are given. In terms of average transmitting power, PPM achieves the smallest followed by DPIM, DPPM and DH-PIM, OOK achieves the biggest. With regard to bandwidth requirement, OOK achieves the smallest followed by DH-PIM, DPPM and DPIM, PPM achieves the biggest. As for transmission capacity, DPPM achieves the biggest followed by DPIM and DH-PIM, OOK and PPM achieves the smallest. Under the condition of the same modulation level, PPM achieves the smallest followed by DPIM, DPPM and DH-PIM, OOK achieves the biggest on the part of packet error rate.