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基于紫外非视距(NLOS)单次散射信道传输模型,分析了用于无线紫外光通信的分离双脉冲位置调制(SDPPM)方案的误码性能。介绍了SDPPM调制方案的符号结构,将该调制方案与开关键控调制(OOK)、脉冲位置调制(PPM)和双脉冲位置调制(D-PPM)在带宽需求、功率需求方面进行比较。利用光子计数方法,研究了无背景辐射噪声条件下SDPPM的误符率(SER)。对PPM、D-PPM和SDPPM紫外通信系统的误码性能进行仿真,分析路径损耗对其影响。结果表明,SDPPM在信源比特分组长度m为5和6bit时获得了带宽需求与功率需求的较好平衡。当SER达到10-4时,有效通信距离比D-PPM长20m左右。同时,SDPPM调制方案降低了紫外光散射通信中因多径色散造成的码间串扰(ISI)。
Based on the transmission model of single wavelength non-line-of-sight (NLOS) scattering channel, the bit error performance of a split dual pulse position modulation (SDPPM) scheme for wireless ultraviolet communication is analyzed. The symbolic structure of the SDPPM modulation scheme is introduced. The modulation scheme is compared with OOK, PPM and D-PPM in terms of bandwidth requirements and power requirements. The photon counting method was used to study the symbol error rate (SER) of SDPPM without background radiation noise. The error performance of PPM, D-PPM and SDPPM UV communication system is simulated and the influence of path loss is analyzed. The results show that SDPPM achieves better balance between bandwidth requirement and power requirement when source bit length m is 5 and 6 bits. When SER reaches 10-4, the effective communication distance is about 20m longer than D-PPM. At the same time, the SDPPM modulation scheme reduces intersymbol interference (ISI) due to multipath dispersion in UV-Scattered communications.