调制技术是影响无线光通信质量的重要因素之一，探索合适的调制方式是无线光通信的内在需要，为此，全面深入分析不同新型组合脉冲调制的性能。详细地分析了脉冲位置调制(PPM)和数字脉冲间隔调制(DPIM)等传统调制方式，以及脉冲位置宽度调制(PPWM)、差分脉冲位置宽度调制(DPPWM)、双幅度脉冲位置调制(DAPPM)和双幅度脉冲间隔调制(DAPIM)等新型组合调制方式的符号结构；全面比较了以上调制方式的平均发射功率和带宽需求；在给定模型下分析了它们的差错性能。数值结果表明：DAPPM 的功率利用率最好，DPPWM 的功率效率最低。当二进制比特位M 取一定值时，PPM 的带宽利用率最低，DPPWM 的带宽利用率最高；随着M 的增加，DAPPM 的带宽效率与DPIM 的带宽效率非常接近。而从差错性能看，在相同的信噪比RSN 条件下，当M 取值一定时，DAPPM 的误包率与PPM 接近，均优于其他组合调制方式，随着M 或RSN 增大，系统误包率逐渐减少；同时，通过增大PPWM的r 参数、减少DAPPM 的α 参数，可适当改善差错性能。因此，要根据实际系统的要求选择合适的调制方式。

The modulation technique is one of the important factors affected the quality of optical wireless communication. It need to find the appropriate modulation scheme, and it is necessary to analyze the performances of different pulse modulation schemes completely and deeply. The symbol structures of not only traditional modulation scheme like pulse position modulation (PPM) and digital pulse interval modulation (DPIM) but also new hybrid modulation scheme such as pulse position width modulation (PPWM), differential pulse position width modulation (DPPWM), dual- amplitude pulse position modulation and dual- amplitude pulse interval modulation (DAPIM) are analyzed in detail. The average transmission power and bandwidth efficiency for these above modulation schemes are also analyzed. At last, the error performances of these different modulation schemes are derived in detail. The numerical results show that the power utilization of DAPPM is the best and DPPWM’s is the worst; when the value of binary bits M is given, the bandwidth utilization of DPPWM is the best, but PPM’s is the worst. With the increase of M , the bandwidth utilization of DAPPM is near to DPIM’s. When the values of M and signal to noise ratio RSN are given, the packet error rate of DAPPM is near to PPM’s, but they are better than the others. The packet error rate is gradually reduced with the increase of M and RSN . At the same time, through the enlargement of r or the decrease of α , the error performances of PPWM and DAPPM are partly improved. Consequently, the appropriate modulation scheme is need to be selected according to the system’s demand.