基于复合索引的MM-OFDM-SFCIM系统设计与检测算法  

Design and Detection Algorithm Research of MM-OFDM-SFCIM System Based on Composite Index

作　　者：张莹莹 袁伟娜[1] 朱煜[1] ZHANG Yingying;YUAN Weina;ZHU Yu(School of Information Science and Engineering,East China University of Science and Technology,Shanghai 200237,China)

机构地区：[1]华东理工大学信息科学与工程学院,上海200237

出　　处：《华东理工大学学报（自然科学版）》2024年第3期442-449,共8页Journal of East China University of Science and Technology

基　　金：国家自然科学基金(61501187)。

摘　　要：空间调制(Spatial Modulation, SM)技术和OFDM多模子载波索引调制(OFDMMulti-Mode Index Modulation, MM-OFDM-IM)技术分别在能量效率(Energy Efficiency,EE)和频谱效率(Spectral Efficiency,SE)上有着很大的优势。多维度索引调制技术相结合能够应用多种物理资源,应对无线通信系统对数据传输和系统容量的高需求,由此将SM与MMOFDM-IM系统灵活结合,构建基于空频结合的多模复合索引调制(OFDM-Multiple-Mode Space Frequency Composite Index Modulation,MM-OFDM-SFCIM)系统,保留传统子载波索引调制技术中的静默子载波,拓展新的复合系数维度,提高系统的SE和EE。针对系统的复杂特性,提出了基于符号能量及对数似然的联合检测算法(REML based on symbolic Energy and LLR,EL-REML)。仿真结果表明,MM-OFDM-SFCIM系统比传统的空频结合系统在SE上提高了约30%,并且MM-DFDM-SPCIM系统中提出的EL-REML算法比LLR算法在误码率上提高了3~4 dB,相比传统的ML算法,其计算复杂度更低。Spatial Modulation(SM)and Orthogonal Frequency Division Multiplexing(OFDM)Multi-Mode Index Modulation(MM-OFDM-IM)techniques have significant advantages in Energy Efficiency(EE)and Spectral Efficiency(SE),respectively.The combination of multi-dimensional index modulation technology can apply multiple physical resources to meet the high demand for data transmission and system capacity in wireless communication systems.Therefore,SM and MM-OFDM-IM systems can be flexibly combined to construct an OFDM Multiple Mode Space Frequency Composite Index Modulation(MM-OFDM-SFCIM)based on space frequency combination.This system can retain the silent subcarriers in traditional subcarrier index modulation technique,expanding new composite coefficient dimensions and improving its SE and EE.Aiming at the complex characteristics of this system,this paper proposes a joint detection algorithm EL-REML(REML based on symbolic Energy and LLR)based on symbolic energy and log-likelihood.The simulation results show that the MM-OFDM-SFCIM system achieves about 30%improvement in SE compared to traditional space-frequency combination systems,and the EL-REML algorithm proposed in this system achieves a 3—4 dB improvement in BER(Bit Error Rate)compared to the LLR algorithm.Compared with traditional ML algorithm,this algorithm has lower computational complexity.

关 键 词：SM MM-OFDM-IM 频谱效率 计算复杂度 误码率 

分 类 号：TN929.5[电子电信—通信与信息系统]