单周动态补偿的光通信码间抑制抗干扰新方法

发布时间：2018-05-21 18:51

本文选题：光通信 + 码间干扰　；参考：《计算机仿真》2015年07期

【摘要】：在可见光通信中由于多径信道重组产生空间聚焦,引起码间干扰导致信道失衡,需要进行码间抗干扰抑制。传统方法采用正交频分复用方法进行LED失真抑制时,由于载波幅值出现负信号失真,无法实现单周动态补偿,效果不佳。提出一种单周动态补偿的光通信码间抑制抗干扰新方法。采用BPSK调制码元分布构建可见光通信的多径信道模型,计算频谱能量,把输入的比特流进行串并转换和调制,产生谐波单周增益,对通信信号进行OFDM分解,完成信号和翻转负信号的时域采样,进而实现LED非线性单周控制动态补偿,并将信号以光功率的形式发射到光无线通信信道,通过动态补偿样本选择加权系数,完成码间抗干扰抑制。仿真结果表明,上述方法能有效地重组多径信号,拟制码间杂波干扰,空间增益聚焦特性较好,误比特率有很大降低,为光通信优化设计提供了参考。
[Abstract]:In visible light communication, inter-symbol interference (ISI) leads to channel imbalance due to spatial focusing caused by multi-path channel recombination, which requires intersymbol anti-jamming suppression. When the traditional method adopts orthogonal frequency division multiplexing method to suppress LED distortion, because of the negative signal distortion of carrier amplitude, the one-cycle dynamic compensation can not be realized, so the effect is not good. A new method of intersymbol suppression for one cycle dynamic compensation is proposed. The multipath channel model of visible light communication is constructed by using BPSK modulation symbol distribution. The spectrum energy is calculated and the input bit stream is converted and modulated to generate harmonic single-cycle gain. The communication signal is decomposed by OFDM. The time-domain sampling of signal and negative signal is completed, and the dynamic compensation of nonlinear one-cycle control of LED is realized. The signal is transmitted to the optical wireless communication channel in the form of optical power, and the weighting coefficient is selected by dynamically compensating the sample. Complete intersymbol anti-interference suppression. The simulation results show that the proposed method can effectively recombine multipath signals, simulate inter-code clutter interference, have good spatial gain focusing characteristics and greatly reduce the bit error rate, which provides a reference for the optimal design of optical communication.
【作者单位】：北华航天工业学院电子工程系;
【分类号】：TN929.1

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