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电力线通信与可见光通信融合的多输入多输出系统性能研究

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  摘 要: 提出了一種电力线通信(PLC)-可见光通信(VLC)融合的多输入多输出 (MIMO) 系统.采用二进制相移键控(BPSK)调制技术输入信号,依次通过PLC信道和VLC信道传输信息.仿真结果表明:相比于PLC的第二种参考信道,第一种参考信道的性能更好,且在无脉冲噪声的情况下,系统的误码率较低.此外,还研究了脉冲噪声参数对系统性能的影响.
  关键词: 电力线通信(PLC); 可见光通信(VLC); 多输入多输出 (MIMO); 二进制相移键控(BPSK); 误码率
  中图分类号: TN 929.5文献标志码: A文章编号: 1000-5137(2019)01-0050-06
  Abstract: It proposed a multiple input multiple output (MIMO) system which combined power line communication (PLC) and visible light communication (VLC).The system adopted the binary phase shift keying (BPSK) modulation technology to input the signal and transmitted the information through the PLC channel and VLC channel in turn.The simulated results showed that the performance of the first reference channel was better than the second reference channel of the PLC.What′s more,the bit error rate of the system is much lower without impulse noise.In addition,the impulse noise parameter impact on the system performance was obtained.
  0 引 言
  可见光通信(VLC)由于其较高安全性、无电磁干扰、更宽的频谱和更高的传输速率等固有特性[1-2],已成为未来第五代移动通信系统(5G)中室内光通信的革命性技术之一[3-4].
  在VLC系统中,最常用的方案是强度调制(IM)和直接检测(DD)[5].2004年,针对IM/DD式的大气湍流信道,BRANDT-PEARCE等[6]推导并仿真了采用量化脉冲位置调制技术的多输入多输出(MIMO)光通信的误码性能.WU等[7]研究了一种克服发光二极管(LED)调制带宽限制的基于正交频分复用的MIMO-VLC系统,此系统满足IM/DD传输信号的要求,且降低了系统的计算复杂度.PARK等[8]提出并研究了一种减少室内MIMO-VLC系统信道矩阵相关性的非成像镜像分集接收机,得到了满足条件的信道矩阵.
  就目前的技术而言,VLC必须接入室内覆盖广泛的骨干网,才可以保证良好的通信质量.所有LED都连接到室内VLC系统中的电源线,所以采用电力线作为骨干网.作为骨干网,电力线通信(PLC)的带宽可以达到30 MHz,从而可以支持快速可靠的网络通信[9].目前,许多文献研究了集成的PLC-VLC系统.KOMINE等[10]提出了一个集成PLC-VLC系统,并分析了二进制调制方案的误码率.KOMINE等[11]进一步分析了窄带正交频分复用的系统性能.MA等[12]提出了中继和MIMO技术逐渐成为PLC-VLC系统中实现的潜在技术.针对PLC和VLC技术的混合系统,NLOM等[13]提出了一个简化的融合PLC-VLC系统信道模型,实施的噪声情景是从PLC和VLC噪声幅度谱的实际测量中获得的观察结果,最后强调了PLC和VLC通道中模型参数和噪声的影响.本文作者研究了基于二进制相移键控(BPSK)调制技术融合的PLC-VLC MIMO系统性能,讨论了PLC信道及其信道脉冲参数对系统性能的影响.
  4 结 论
  本文作者基于BPSK调制技术研究了融合PLC-VLC MIMO的系统性能.随着信噪比的增加,融合的PLC-VLC MIMO系统的误码率逐渐降低,仿真结果验证了此结论.通过仿真比较可以看出,所提PLC的两个参考信道中,参考信道1的性能比较好,当脉冲噪声存在时,系统有较高的误码率.此外,脉冲噪声的参数A和Γ对系统性能也有影响.在下一步的研究工作中,将考虑如何减少其对系统性能的影响.
  参考文献:
  [1] ELGALA H,MESLEH R,HAAS H.Indoor optical wireless communication:potential and state-of-the-art [J].IEEE Communications Magazine,2011,49(9):56-62.
  [2] KOMINE T,NAKAGAWA M.Fundamental analysis for visible-light communication system using LED lights [J].IEEE Transactions on Consumer Electronics,2004,50(1):100-107
  [3] ANDREWS J G,BUZZI S,CHOI W,et al.What will 5G be? [J].IEEE Journal on Selected Areas in Communications,2014,32(6):1065-1082.
  [4] FENG L,HU R Q,WANG J,et al.Applying VLC in 5G networks:architectures and key technologies [J].IEEE Network,2016,30(6):77-83.   [5] WU L,ZHANG Z,LIU H.Modulation scheme based on precoder matrix for MIMO optical wireless communication systems [J].IEEE Communications Letters,2012,16(9):1516-1519.
  [6] BRANDT-PEARCE M,WILSON S,CAO Q,et al.Code design for optical MIMO systems over fading channels [C]//Conference on Signals Systems and Computers.Pacific Grove:IEEE,2004:871-875.
  [7] WU L,ZHANG Z,LIU H.MIMO-OFDM visible light communications system with low complexity [C]//2013 IEEE International Conference on Communications.Budapest:IEEE,2013:3933-3937.
  [8] PARK K H,ALHEADARY W G,ALOUINI M S.A novel mirror diversity receiver for indoor MIMO visible light communication systems [C]//27th Annual International Symposium on Personal Indoor and Mobile Radio Communications.Valencia:IEEE,2016:1-6.
  [9] GOTZ M,RAPP M,DOSTERT K.Power line channel characteristics and their effect on communication system design [J].IEEE Communications Magazine,2004,42(4):78-86.
  [10] KOMINE T,NAKAGAWA M.Integrated system of white LED visible light communication and power-line communication [J].IEEE Transaction on Consumer Electronics,2003,49(1):71-79.
  [11] KOMINE T,HARUYAMA S,NAKAGAWA M.Performance evaluation of narrowband OFDM on integrated system of power line communication and visible light wireless communication [C]//2006 1st International Symposium on Wireless Pervasive Computing.Phuket:IEEE,2016:1-6.
  [12] MA H,LAMPE L,HRANILOVIC S.Integration of indoor visible light and power line communication systems [C]//17th International Symposium on Power Line Communications and Its Applications.Johannesburg:IEEE,2013:291-296.
  [13] NLOM S M,NDJIONGUE A R,OUAHADA K,et al.A simplistic channel model for cascaded PLC-VLC systems [C]//2017 IEEE International Symposium on Power Line Communications and Its Applications.Madrid:IEEE,2017:1-6.
  [14] GOTZ M,RAPP M,DOSTERT K.Power line channel characteristics and their effect on communication system design [J].IEEE Communications Magazine,2004,42(4):78-86.
  [15] SHONGWEY T,VINCK A J H,FERREIRA H C.On impulse noise and its models [C]//18th IEEE International Symposium on Power Line Communications and Its Applications.Glasgow:IEEE,2014:12-17.
  (責任编辑:郁 慧,包震宇)
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