Design and Performance Research of Adaptive Direct Current Biased Offset Optical-OFDM System for Visible Light Communication
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摘要: 传统的直流偏置光正交频分复用(DCO-OFDM)系统通过添加直流偏置(DC)和限幅获得单极性信号，由于傅里叶逆变换(IDFT)输出时域信号的随机性，固定的直流偏置会产生较大的非线性限幅失真。该文提出设计自适应直流偏置光正交频分复用(ADCO-OFDM)系统，以双边限幅前、后符号之间的均方误差(MSE) 最小化为优化目标，求解使非线性限幅失真最小的DC。介绍了ADCO-OFDM系统原理、推导了子载波比特信噪比(SNR)，建立了均方误差最小化优化模型，并给出了最优直流偏置的求解过程。采用蒙特卡罗(Monte Carlo)仿真方法分析了误码率(BER)和光功率消耗，验证了系统设计和性能分析的正确性。Abstract: The traditional Direct Current (DC) biased offset Optical Orthogonal Frequency Division Multiplexing (DCO-OFDM) system obtains a unipolar signal by adding a DC offset and limiting amplitude. Due to the randomness of the Inverse Discrete Fourier Transform (IDFT) output time domain signal, a fixed DC offset will produce larger non-linear limiting distortion. It is proposed to design an Adaptive DC offset Optical OFDM (ADCO-OFDM) system to minimize the Mean Square Error (MSE) between the symbols before and after bilateral clipping as the optimization objective, and to solve the DC that minimizes nonlinear clipping distortion. The principle of the ADCO-OFDM system is introduced, the Signal-to-Noise Ratio (SNR) of sub-carrier bits is deduced, an optimization model for minimizing the mean square error is established, and the process of solving the optimal DC offset is given. The Monte Carlo simulation method is used to analyze the Bit Error Rate (BER) and optical power consumption, which verifies the correctness of the system design and performance analysis.
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[1] NA Dongjun and CHOI K. DFT spreading-based low PAPR FBMC with embedded side information[J]. IEEE Transactions on Communications, 2020, 68(3): 1731–1745. doi: 10.1109/TCOMM.2019.2918526 [2] YANG Yang, YANG Yujie, CHEN Mingzhe, et al. Joint LED selection and precoding optimization for multiple-user multiple-cell VLC systems[J]. IEEE Internet of Things Journal, 2022, 9(8): 6003–6017. doi: 10.1109/JIOT.2021.3109135 [3] GE Pengfei, LING Xintong, WANG Jiaheng, et al. Optical filter bank modeling and design for multi-color visible light communications[J]. IEEE Photonics Journal, 2021, 13(1): 7901219. doi: 10.1109/JPHOT.2021.3053177 [4] MOHAMMED N A, ELNABAWY M M, and KHALAF A A M. PAPR reduction using a combination between precoding and non-linear companding techniques for ACO-OFDM-based VLC systems[J]. Opto-Electronics Review, 2021, 29(2): 59–70. doi: 10.24425/opelre.2021.135829 [5] PENG Hao, WANG Zixiong, HAN Shiying, et al. Physical layer security for MISO NOMA VLC system under eavesdropper collusion[J]. IEEE Transactions on Vehicular Technology, 2021, 70(6): 6249–6254. doi: 10.1109/TVT.2021.3078803 [6] ELGALA H, MESLEH R, and HAAS H. An LED model for intensity-modulated optical communication systems[J]. IEEE Photonics Technology Letters, 2010, 22(11): 835–837. doi: 10.1109/LPT.2010.2046157 [7] ZHANG Mingxuan and ZHANG Zaichen. An optimum DC-biasing for DCO-OFDM system[J]. IEEE Communications Letters, 2014, 18(8): 1351–1354. doi: 10.1109/LCOMM.2014.2331068 [8] JIANG Ming, ZHANG Jun, LIANG Xiao, et al. Direct current bias optimization of the LDPC coded DCO-OFDM systems[J]. IEEE Photonics Technology Letters, 2015, 27(19): 2095–2098. doi: 10.1109/LPT.2015.2453344 [9] 陆庆峰, 季新生, 黄开枝, 等. 降低可见光通信不均匀限幅正交频分复用系统非线性限幅失真的功率分配方法[J]. 光学学报, 2014, 34(7): 46–53. doi: 10.3788/AOS201434.0706004LU Qingfeng, JI Xinsheng, HUANG Kaizhi, et al. Power allocation method for reducing nonlinearity clipping distortion in asymmetrically clipped optical orthogonal frequency division multiplexing based visible light communication[J]. Acta Optica Sinica, 2014, 34(7): 46–53. doi: 10.3788/AOS201434.0706004 [10] ELGALA H, MESLEH R, and HAAS H. A study of LED nonlinearity effects on optical wireless transmission using OFDM[C]. 2009 IFIP International Conference on Wireless and Optical Communications Networks, Cairo, Egypt, 2009: 1–5. [11] YU Meishuang, ZHANG Zaichen, WU Liang, et al. Optimal symmetric double-sided signal clipping in DCO-OFDM visible light communication[C]. 2014 Sixth International Conference on Wireless Communications and Signal Processing (WCSP), Hefei, China, 2014: 1–4. [12] SHEU J S, LI Bingjia, and LAIN J K. LED non-linearity mitigation techniques for optical OFDM-based visible light communications[J]. IET Optoelectronics, 2017, 11(6): 259–264. doi: 10.1049/iet-opt.2017.0059 [13] JIA Kejun and HAO Li. The design and performance analysis of optical wireless ACO-MC-CDMA system in the presence of clipping noise[J]. Science China Information Sciences, 2018, 61(2): 029304. doi: 10.1007/s11432-017-9130-7 [14] 贾科军, 陆皓, 杨博然, 等. LED非线性对可见光通信系统性能的影响[J]. 激光与光电子学进展, 2020, 57(15): 150603. doi: 10.3788/LOP57.150603JIA Kejun, LU Hao, YANG Boran, et al. Influence of LED nonlinearity on performance of visible light communication systems[J]. Laser &Optoelectronics Progress, 2020, 57(15): 150603. doi: 10.3788/LOP57.150603 [15] JIA Kejun, JIN Bin, HAO Li, et al. Performance analysis of DCO-OFDM and ACO-OFDM systems in indoor visible light communications[J]. Chinese Journal of Lasers, 2017, 44(8): 0806003. doi: 10.3788/CJL201744.0806003 [16] ROWE H E. Memoryless nonlinearities with gaussian inputs: Elementary results[J]. The Bell System Technical Journal, 1982, 61(7): 1519–1525. doi: 10.1002/j.1538-7305.1982.tb04356.x -
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