光通信技术, 2023, 47 (6): 0006, 网络出版: 2024-02-02  

基于LWT-OFDM的NOMA-VLC系统

NOMA-VLC system based on LWT-OFDM
作者单位
西安工业大学 电子信息工程学院, 西安 710021
摘要
针对基于傅里叶变换光正交频分复用(FFT-OFDM)的非正交多址可见光通信(NOMA-VLC)系统存在可靠性低、用户公平性差等问题, 提出将提升小波变换(LWT)作为载波调制方式, 建立基于LWT-OFDM的NOMA-VLC系统, 介绍了系统中的信号处理过程, 构建了5 m×5 m×3 m的室内空间实验环境。实验结果表明: 与基于FFT-OFDM的NOMA-VLC系统相比, 随着正交幅度调制方式的阶次由4增大到64, 所提系统的平均误码率达到阀值3.8×10-3时, 所需的信噪比(SNR)值较低, 至少低4.4 dB; 用户性能差异变化不明显甚至不变。
Abstract
Aiming at the problems of low reliability and poor user fairness in non orthogonal multiple access visible light communication(NOMA-VLC) system based on Fourier transform optical orthogonal frequency division multiplexing(FFT-OFDM), a carrier modulation method called lifting wavelet transform(LWT) is proposed to establish a NOMA-VLC system based on LWT-OFDM. The signal processing process in the system is introduced, and an indoor space experiment environment of 5 m×5 m×3 m is constructed. The experimental results show that compared with the NOMA-VLC system based on FFT-OFDM, when the order of orthogonal amplitude modulation increases from 4 to 64, the required signal to noise ratio(SNR) value is lower, at least 4.4 dB lower, when the average bit error rate of the proposed system reaches the threshold of 3.8×10-3. User performance differences do not change significantly or even remain unchanged.
参考文献

[1] ARFAOUI M A, GHRAYEB A, ASSI C, et al. Comp-assisted NOMA and cooperative NOMA in indoor VLC cellular systems [J]. IEEE Transac-tions on Communications, 2022, 70(9): 6020-6034.

[2] ZHANG L, FANG F, WU Z. Energy efficient power allocation for OFDM-NOMA visible light communication systems with statistical channel state information[C]//International Symposium on Medical Information and Communication Technology, April 14-16, 2021, Xiamen, China. New York: IEEE, 2021: 110-115.

[3] DIXIT V, KUMAR A. Error analysis of L-PPM modulated MIMO based multi-user NOMA-VLC system with perfect and imperfect SIC[J]. Applied optics, 2022, 61(4): 858-867.

[4] 宋小庆, 王慕煜, 邢松, 等. 基于可见光通信的正交频分复用技术研究进展[J]. 激光与光电子学进展, 2018, 55(12): 106-115.

[5] ASSAIDAH A, LIU Y, CHOW C W, et al. Demonstration of non-hermitian symmetry(NHS) IFFT/FFT size efficient OFDM non-orthogonal multiple access(NOMA) for visible light communication [J]. IEEE Photonics Journal, 2020, 12(3): 1-5.

[6] LEVENT V E, UYSAL M, SAGLAM G, et al. FPGA based DCO-OFDM PHY transceiver for VLC systems[C]// 2019 11th International Conference on Electrical and Electronics Engineering (ELECO), November 28-30, 2019, Bursa, Turkey. New York: IEEE, 2019: 418-421.

[7] AYKIRI G, AVCI B, ZEN A, et al. M-CSK and M-QAM modulated DCO-OFDM for visible light communication systems [C]//2022 30th signal processing and communications applications conference(SIU), May15-18, 2022, Safranbolu, Turkey. New York: IEEE, 2022: 1-4.

[8] PANG J, NI S, WANG F, et al. Performance analysis of FSO system using FFT-OFDM and DWT-OFDM [C]//Optoelectronics and Communi-cations Conference (OECC) and 2019 International Conference on Photo-nics in Switching and Computing(PSC), July 7-11, 2019, Fukuoka, Japan. New York: IEEE, 2019: 1-3.

[9] HARIPRASAD N, SUNDARI G. Comparative analysis of the BER performance of DWT OFDM over that of FFT OFDM in presence of phase noise[C]//International Conference on Robotics, Automation, Control and Embedded Systems(RACE), February18-20, 2015, Chennai, India. New York: IEEE, 2015: 1-4.

[10] KHAN A, KHAN S, BAIG S, et al. Wavelet OFDM with overlap FDE for non-Gaussian channels in precoded NOMA based systems[J]. Future Generation Computer Systems, 2019, 97(4): 165-179.

[11] 赵黎, 董航航, 张峰. 基于LWT的可见光DCO-OFDM 系统[J]. 光子学报, 2021, 50(5): 121-129.

[12] AVCI B, AYKIRI G, SAVASCIHABES A, et al. A novel asymmetrically clipped optical orthogonal frequency division multiplexing system based on lifting wavelet transform for visible light communications[J]. International Journal of Communication Systems, 2022, 35(6): e5082-1-e5082-21.

[13] 丁莉, 陈玮青. 提升小波变换算法的分析与研究[J].自动化与仪器仪表, 2016, 14(4): 179-180.

[14] GAO J B, ZHAO E Y. A new OFDM system based lifting wavelet transform for wireless channel[J]. The Journal of China Universities of Posts and Telecommunications, 2005, 12(3): 21-25.

[15] AYVAZ E N, MARAS M, GOMEC M, et al. A novel waveform design based on lifting wavelet transform for the 5G beyond[C]//IEEE 42th Interna-tional Conference on Telecommunications and Signal Processing (TSP 2019), July 1-3, 2019, Budapest, Hungary. New York: IEEE, 2019: 660-663.

[16] 贾科军, 郝莉, 余彩虹. 室内可见光通信多径信道建模及MIMO-ACO-OFDM系统性能分析[J]. 光学学报, 2016, 36(7): 57-68.

[17] 张峰, 梁渊博, 赵黎, 等. 基于非正交多址的室内可见光通信系统性能优化方法[J]. 红外与激光工程, 2021, 50(11): 311-317.

[18] NGENE C, ETHAKUR P, SINGH G. Analysis of power allocation in visible light-NOMA communication using uniform probability distribution function[C]//2021 International Conference on Artificial Intelligence, Big Data, Computing and Data Communication Systems(ICABCD), August 5-6, 2021, Durban, South Africa. New York: IEEE, 2021: 1-5.

樊欣, 张峰, 赵黎. 基于LWT-OFDM的NOMA-VLC系统[J]. 光通信技术, 2023, 47(6): 0006. FAN Xin, ZHANG Feng, ZHAO Li. NOMA-VLC system based on LWT-OFDM[J]. Optical Communication Technology, 2023, 47(6): 0006.

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