紫外分离双脉冲位置调制误码性能分析
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摘要
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 non-line of sight(NLOS)ultraviolet single-scattering channel transmission model,the error performance of separated dual-pulse pulse position modulation(SDPPM)for wireless ultraviolet communications is analyzed.The symbol structure of SDPPM scheme is introduced,then the bandwidth and power requirements are compared among the on-off keying(OOK),pulse position modulation(PPM),and dual-pulse pulse position modulation(D-PPM).The photon counting method is used for study on the symbol error rate(SER)of SDPPM.The error performance of UV communication system with different modulation schemes of PPM,D-PPM and SDPPM is simulated to analyze the effect of path loss.The results show that the value of bandwidth and average power requirements of SDPPM are compromised at 6bit when the(source packet length)mis 5.When the SER is 10-4,the communication distance of SDPPM is about 20 m longer than D-PPM.The inter symbol interference(ISI)caused by multipath dispersion in ultraviolet scattering communication is reduced because of its symbol structure.
Based on the non-line of sight(NLOS)ultraviolet single-scattering channel transmission model,the error performance of separated dual-pulse pulse position modulation(SDPPM)for wireless ultraviolet communications is analyzed.The symbol structure of SDPPM scheme is introduced,then the bandwidth and power requirements are compared among the on-off keying(OOK),pulse position modulation(PPM),and dual-pulse pulse position modulation(D-PPM).The photon counting method is used for study on the symbol error rate(SER)of SDPPM.The error performance of UV communication system with different modulation schemes of PPM,D-PPM and SDPPM is simulated to analyze the effect of path loss.The results show that the value of bandwidth and average power requirements of SDPPM are compromised at 6bit when the(source packet length)mis 5.When the SER is 10-4,the communication distance of SDPPM is about 20 m longer than D-PPM.The inter symbol interference(ISI)caused by multipath dispersion in ultraviolet scattering communication is reduced because of its symbol structure.
引文
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[2]Ding H,Chen G,Majumdar A K,et al.Correction to modeling of non-line-of-sight ultraviolet scattering channels for communication[J].IEEE J.on Selected Areas in Commun.,2009,27(9):1535-1544.
[3]Dong K,Lou Y,Ding Y,et al.Research on UV scattering communication[J].Proc.of SPIE,2013:890612-890612-7.
[4]Zhang H,Yin H,Jia H,et al.Study of effects of obstacle on non-line-of-sight ultraviolet communication links[J].Opt.Express,2011,19(22):21216-21226.
[5]Zhang Kai,Zhang Haitao,Gong Mali,et al.Performance of dual-amplitude pulse interval modulation for wireless infrared communications[J].J.Infrared Millim.Waves,2003,22(6):411-414.
[6]Xu Zhiyong,Shen Lianfeng,Wang Jingyuan,et al.Study on separated double pulse position modulation and its performance[J].J.on Commun.,2009,30(11):113-119.
[7]Mahdiraji G A,Zahedi E.Comparison of selected digital modulation schemes(OOK,PPM and DPIM)for wireless optical communications[C]//IEEE Xplore Student Conf.on Research and Development,2006:5-10.
[8]Jiang Y,Tao K,Song Y,et al.Packet error rate analysis of OOK,DPIM,and PPM modulation schemes for ground-tosatellite laser uplink communications[J].Appl.Opt.,2014,53(7):1268-1273.
[9]徐智勇,沈连丰,汪井源,等.分离双脉冲位置调制及其性能研究[J].通信学报,2009,30(11):113-119.Xu Zhiyong,Shen Lianfeng,Wang Jingyuan,et al.Study on separated double pulse position modulation and its performance[J].J.on Commun.,2009,30(11):113-119.
[10]Chen G,Abougalala F,Xu Z,et al.Experimental evaluation of LED-based solar blind NLOS communication links[J].Opt.Express,2008,16(19):15059-15068.
[11]Xu Z.Approximate performance analysis of wireless ultraviolet links[C]//IEEE Inter.Conf.on Acoustics,Speech and Signal Processing,2007:Ⅲ-577-Ⅲ-580.
[12]He Q,Sadler B M,Xu Z.Modulation and coding tradeoffs for non-line-of-sight ultraviolet communications[J].Proc.of SPIE,2009,7464:74640H-74640H-12.