可见光通信叠加ACO-OFDM调制技术

发布时间：2018-01-07 13:16

本文关键词：可见光通信叠加ACO-OFDM调制技术　出处：《计算机工程》2017年10期 　论文类型：期刊论文

【摘要】：有限层信息流叠加时频谱能量有效正交频分复用(SEE-OFDM)技术与直流偏置光正交频分复用(DCOOFDM)技术的频谱效率存在差距。针对该问题,提出一种基于SEE-OFDM的叠加非对称限幅光正交频分复用(ACO-OFDM)调制技术。通过改变不同层信息流的调制阶数,使得叠加ACO-OFDM的频谱效率与DCO-OFDM相等。对系统误比特率(BER)进行理论分析,确定系统BER最小时的调制阶数组合算法,并提取每层信息流在解调时的子载波。实验结果表明,当频谱效率为1.5时,在线性AWGN信道下叠加ACO-OFDM技术的BER性能要优于DCO-OFDM技术与ACO-OFDM技术。
[Abstract]:Spectral Energy efficient orthogonal Frequency Division Multiplexing (SEE-OFDM) and DC bias Optical orthogonal Frequency Division Multiplexing (DCOOFDM). There is a gap in the spectral efficiency of the technology. A modulation technique based on SEE-OFDM for overlapping asymmetric limiting optical orthogonal frequency division multiplexing (ACO-OFDM) is proposed. The modulation order of different layers of information flow is changed by changing the modulation order of ACO-OFDM. The spectrum efficiency of superposition ACO-OFDM is equal to that of DCO-OFDM. The system bit error rate (ber) is analyzed theoretically, and the modulation order combination algorithm when the system BER is minimum is determined. The sub-carriers of each layer of information flow in demodulation are extracted. The experimental results show that when the spectral efficiency is 1.5. The BER performance of superposition ACO-OFDM in linear AWGN channel is better than that of DCO-OFDM and ACO-OFDM.
【作者单位】：解放军信息工程大学信息系统工程学院;
【基金】：国家高技术研究发展计划项目(2013AA013603)
【分类号】：TN929.1
【正文快照】： 0概述近年来,可见光通信(Visible Light Communication,VLC)作为一种新兴技术得到越来越多的关注和研究。可见光通信分别采用现有的发光二极管(Light EmittingDiode,LED)和光电检测器(Photodiodes,PD)作为发射端和接收端,可以同时实现照明和通信双重功能[1]。LED作为VLC系统的

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