室内可见光通信中DCO-OFDM和ACO-OFDM系统性能分析

发布时间：2018-01-18 15:27

本文关键词：室内可见光通信中DCO-OFDM和ACO-OFDM系统性能分析　出处：《中国激光》2017年08期 　论文类型：期刊论文

【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]:In the single light source indoor visible light communication (VLC) system, in order to evaluate the effect of multipath effect on the system performance accurately. An indoor VLC multipath channel modeling method is proposed. The impulse response of line of sight transmission and reflection transmission is calculated by iterative method. The relationship between the sampling period of the receiver and the LED modulation bandwidth is analyzed, and the inter-symbol interference (ISI) is defined. The LOS channel delay is taken as the starting point. The sum of all impulse responses between adjacent sampling intervals at the receiving end is taken as the path gain of the multipath channel. The orthogonal Frequency Division Multiplexing (OFDM) technique can effectively resist the ISI in the indoor multipath channel. Considering the influence of nonlinear amplitude limiting noise, the theoretical bit error rate (BER) of DC bias optical OFDM (DCO-OFDM) and asymmetric limiting optical OFDM (ACO-OFDM) is derived. A Monte Carlo simulation model is established to study the half power angle of the photodetector (PDD) position and LED. The effect of PD field angle of view (FOV) and DC bias parameters on the performance of the BER system is studied. The simulation results show that when PD is in the center of the room, the minimum BER performance is affected by multipath interference. When PD is moved to the wall position, the performance of BER is poor due to multipath interference. With the increase of half-power angle of FOV and LED, the power of reflected light received by PD increases, and the multi-path interference increases and the performance of BER becomes worse. The larger the DC bias, the worse the BER performance of DCO-OFDM systems.
【作者单位】：兰州理工大学计算机与通信学院;西南交通大学信息编码与传输四川省重点实验室;
【基金】：国家自然科学基金(61461026,61465007) 东南大学移动通信国家重点实验室开放研究基金(2014D13)
【分类号】：TN929.1
【正文快照】： 0806003-1larger.As the FOV and the semi-angle at half power of LED increase,BER performance degrades due to the increasedreceived power and multipath interference.Moreover,BER performance of DCO-OFDM system is more worse when DCbiasing is larger.可见光通

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