分离双脉冲位置调制及其性能研究

Study on separated double pulse position modulation and its performance

提出了一种可应用于无线传感器网络的紫外光通信的调制方式——分离双脉冲位置调制(SDPPM,separated double pulse position modulation)。在详细阐述其调制结构的基础上,分析了不同比特分组长度下SDPPM的带宽需求,推导了SDPPM的误码率表达式,讨论了SDPPM的功率需求,并与无线光通信中常用的等时隙数的调制方式开关键控(OOK,on-offkeying)、脉冲位置调制(PPM,pulse position modulation)和多脉冲位置调制(MPPM,multi-PPM)进行了对比。结果表明,SDPPM的功率需求和带宽需求取得了较好的平衡,SDPPM的符号结构还决定了它在紫外光散射通信中具有更好的抗多径色散性能。

Separated double pulse position modulation （SDPPM） in wireless ultraviolet communication was presented. The structure of the SDPPM was described in detail. Requirements of the power and the bandwidth for SDPPM were analyzed and the BER was derived. Then these performances were compared with modulation of equal slots, such as OOK, PPM and MPPM. The results show that the SDPPM achieves better compromise between power requirement and bandwidth requirement, and the SDPPM has better performance in anti-multipath dispersion in ultraviolet communication because of its symbol structure.