可见光通信预编码O-OFDM自适应符号分解技术研究  

Research on Adaptive Symbol Decomposition Technology of Precoding O-OFDM in Visible Light Communication

作　　者：贾科军[1] 南钰桐 杨博然 魏少博 JIA Kejun;NAN Yütong;YANG Boran;WEI Shaobo(School of Computer and Communication,Lanzhou University of Technology,Lanzhou 730050,China;School of Information Science and Technology,Southwest Jiaotong University,Chengdu 610031,China;Information and Communication Company,State Grid Shanxi Electric Power Co.,Ltd.,Xi’an 710000,China)

机构地区：[1]兰州理工大学计算机与通信学院,兰州730050 [2]西南交通大学信息科学与技术学院,成都610031 [3]国网陕西省电力有限公司信息通信公司,西安710000

出　　处：《光通信研究》2024年第4期26-32,共7页Study on Optical Communications

基　　金：国家自然科学基金资助项目(61875080,61461026);甘肃省科技计划资助项目(22JR5RA276);兰州理工大学博士科研启动资助项目(061903)。

摘　　要：【目的】符号分解技术是降低峰值平均功率比(PAPR)方法中的一种,其将光正交频分复用(O-OFDM)符号分解为PAPR较小的多个分解符号,以抑制发光二极管(LED)的非线性效应。但当O-OFDM的PAPR较大时产生的分解符号较多,降低了信息速率和误码率(BER)性能。【方法】文章提出了一种预编码O-OFDM自适应符号分解串行传输(PCO-OFDM-ASDST)方案,采用预编码降低O-OFDM符号的PAPR,从而减小了自适应符号分解的平均符号分解次数。在多径信道下推导了理论信噪比(SNR)表达式,并采用蒙特卡洛仿真分析了PAPR、BER和信息速率性能。【结果】结果表明,在非对称限幅光正交频分复用(ACO-OFDM)系统4阶正交幅度调制(QAM)下,PCO-OFDM-ASDST在BER为10-4的情况下,其符号功率比自适应符号分解串行传输(ASDST)低7 dB;64QAM下,当符号功率为20 dBm时,可以提高10 Mbit/s的信息速率。【结论】PCO-OFDM-ASDST比ASDST系统具有更优的BER和信息传输速率等性能。【Objective】The symbol decomposition technique aims to decompose Optical Orthogonal Frequency Division Multiplexing(O-OFDM)symbols into multiple symbols with a small Peak to Average Power Ratio(PAPR)to mitigate the non-linear effects of Light Emitting Diodes(LEDs).However,O-OFDM generates more decomposed symbols with a higher PAPR,thereby reducing the information rate and degrading the Bit Error Rate(BER)performance.【Methods】The proposed design of Precoding O-OFDM Adaptive Symbol Decomposition with Serial Transmission(PCO-OFDM-ASDST)system uses precoding scheme to reduce the PAPR of O-OFDM symbols.The proposed method can reduce the average number of symbol decompositions for adaptive symbol decomposition.The theoretical Signal-to-Noise Ratio(SNR)expressions are derived for multipath channels,and the performance of PAPR,BER,and information rate is analyzed using Monte Carlo BER simulations.【Results】The results demonstrate that under 4 Quadrature Amplitude Modulation(QAM)modulation in Asymmetrically Clipped Optical Orthogonal Frequency Division Multiplexing(ACO-OFDM)systems,the symbol power required for PCO-OFDM-ASDST is 7 dB less than that of Adaptive Symbol Decomposition with Serial Transmission(ASDST)when the BER is 10-4.Moreover,under 64QAM,the information rate can be increased by 10 Mbit/s when the symbol power is 20 dBm.【Conclusion】The results indicate that the PCO-OFDM-ASDST outperforms ASDST systems in terms of BER and information transmission rate.

关 键 词：可见光通信 光正交频分复用 预编码 峰值平均功率比 符号分解 

分 类 号：TN929.12[电子电信—通信与信息系统]