中国激光, 2017, 44 (8): 0806003, 网络出版: 2017-09-13   

室内可见光通信中DCO-OFDM和ACO-OFDM系统性能分析 下载: 1664次

Performance Analysis of DCO-OFDM and ACO-OFDM Systems in Indoor Visible Light Communications
作者单位
1 兰州理工大学计算机与通信学院, 甘肃 兰州 730050
2 西南交通大学信息编码与传输四川省重点实验室, 四川 成都 610031
摘要
在单光源室内可见光通信(VLC)系统中, 为了准确评价多径效应对系统性能的影响, 提出一种室内VLC多径信道建模方法。用迭代法计算视线传输(LOS)和反射传输冲激响应, 分析接收端抽样周期和发光二极管(LED)调制带宽之间的关系, 并定义码间干扰(ISI)。以LOS信道时延作为建模起点, 将接收端相邻抽样间隔之间的所有冲激响应之和作为多径信道路径增益。正交频分复用(OFDM)技术能有效抵抗ISI, 在室内多径信道下, 考虑非线性限幅噪声影响时, 推导了直流偏置光OFDM(DCO-OFDM)和非对称限幅光OFDM(ACO-OFDM)的理论误码率(BER), 并建立了蒙特卡罗仿真模型。研究光电检测器(PD)位置、LED的半功率角、PD视场角(FOV)和直流偏置参数对系统BER性能的影响。仿真结果表明, 当PD在房间中心时, 受多径干扰影响最小, BER性能最好; PD移到墙壁位置时, 受多径干扰影响大, BER性能差; 随着FOV和LED半功率角的增大, PD接收到的反射光功率增加, 多径干扰增大, BER性能变差; 直流偏置越大, DCO-OFDM系统BER性能越差。
Abstract
To evaluate the effect of multipath channel accurately, a modeling method for indoor multipath channel in visible light communication (VLC) system with single light source is proposed. The impulse response of line-of-sight (LOS) and reflection transmission is calculated by recursive methods. Inter-symbol-interference (ISI) is defined after the analysis on the relationship between sampling period of receiver and modulation bandwidth of light emitting diode (LED). Considering the delay time of LOS channel as the modeling origin, the gain of multipath channel is regarded as the sum of all the impulse response in adjacent sampling intervals of the receiver. Because the orthogonal frequency division multiplex (OFDM) technique can effectively resist the ISI, the bit-error-rate (BER) of asymmetrically-clipped optical OFDM (ACO-OFDM) system and direct current-biased optical OFDM (DCO-OFDM) system are derived and the Monte Carlo simulation models are built when the nonlinear clipping noise is considered in indoor multipath channel. The BER performance is studied for different locations of photoelectric detector (PD), semi-angles at half power of LED, fields of view (FOV) of PD, and direct current biases. The simulation results indicate that BER performance is best and the multipath interference is smallest when the PD is located at the center of the room. When PD moves towards the room corner, the BER performance becomes worse and the multipath interference become larger. As the FOV and the semi-angle at half power of LED increase, BER performance degrades due to the increased received power and multipath interference. Moreover, BER performance of DCO-OFDM system is more worse when DC biasing is larger.

贾科军, 靳斌, 郝莉, 张守琴. 室内可见光通信中DCO-OFDM和ACO-OFDM系统性能分析[J]. 中国激光, 2017, 44(8): 0806003. Jia Kejun, Jin Bin, Hao Li, Zhang Shouqin. Performance Analysis of DCO-OFDM and ACO-OFDM Systems in Indoor Visible Light Communications[J]. Chinese Journal of Lasers, 2017, 44(8): 0806003.

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