分析了启闭键控调制(OOK)、脉冲位置调制(PPM)、差分脉冲位置调制(DPPM)和数字脉冲间隔调制(DPIM)的编码结构，然后从带宽需求、平均发射功率、传输容量和差错性能等方面对各种调制方式进行了仿真对比。结果表明，DPIM调制比PPM具有更高的传输容量和更少的带宽需求，并且解调对同步要求较低，实现更简易，并结合紫外LED阵列将作为今后实用化紫外光源的发展趋势，DPIM调制在未来紫外光通信系统的应用中将具有更大的优势。

The analysis of the modulation structure is presented for the on-off keying(OOK), pulse position modulation(PPM), differential pulse position modulation(DPPM) and digital pulse interval modulation(DPIM). Various modulation methods were modulated and compared from the bandwidth requirements, the average transmission power, the transmission capacity and the error performance. The results show that compared with PPM, DPIM has a higher transmission capacity, but less bandwidth requirements and demodulation has low requirements on synchronous. The system can be realized more easily. DPIM has more advantages in the application of UV communication system in the future.