增强型索引调制非对称限幅光OFDM系统  

Asymmetrically Clipped Optical OFDM System with Enhanced Index Modulation

作　　者：王惠琴[1] 何婕 曹明华[1] 彭清斌[1] 王斌 WANG Huiqin;HE Jie;CAO Minghua;PENG Qingbin;WANG Bin(School of Computer and Communication,Lanzhou University of Technology,Lanzhou 730050,China;Digital and Intelligent Division of Changqing Oilfield,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]长庆油田数字和智能化事业部,西安710000

出　　处：《北京邮电大学学报》2024年第1期78-84,共7页Journal of Beijing University of Posts and Telecommunications

基　　金：国家自然科学基金项目(62261033,61861026,62265010)。

摘　　要：针对传统索引调制非对称限幅光正交频分复用(OFDM)传输速率不够理想的问题,利用2次选择激活子载波加大激活子载波携带的索引信息,同时在激活子载波上传输不同的调制符号,提出了一种增强型索引调制非对称限幅光OFDM系统。同时,利用子载波选择算法来改善系统的误码性能。介绍了所提系统的映射原理,利用联合界技术推导了其理论误码率,并与传统系统进行对比。结果表明,所提系统不仅提高了传输速率,而且其误码性能得到了明显改善。在强湍流、误码率为1×10^(-3)时,(8,3,3)所提系统的传输速率比(8,6)传统系统提升了1.25倍,信噪比改善了约1.4 dB。To solve the problem that the transmission rate of conventional asymmetrically clipped optical OFDM system with index modulation(OFDM)is not ideal,an asymmetrically clipped optical OFDM with enhanced index modulation system is proposed by selecting the active carrier twice to increase the index information carried by the active subcarrier and transmitting different modulation symbols on the active subcarrier.Meanwhile,the subcarrier selection algorithm is proposed to improve the bit error rate of the system.In particular,the modulation mapping principle of the proposed system is introduced in detail.Then,its theoretical bit error rate is derived by using the joint bound technique.Finally,the proposed system is compared with the conventional systems.The simulation results show that the proposed system not only increases the transmission rate but also improves the bit error rate.Specifically,when the turbulence is strong and the bit error rate is 1×10^(-3),the transmission rate of(8,3,3)the proposed system is 1.25 times higher than that of(8,6)conventional system,meanwhile the signal to noise ratio is improved by about 1.4 dB.

关 键 词：无线光通信 正交频分复用 索引调制 

分 类 号：TN929.12[电子电信—通信与信息系统]