1.武汉大学电子信息学院, 湖北武汉 430072
2.中国地质大学(武汉)机械与电子信息学院, 湖北武汉 430074
3.华北理工大学人工智能学院, 河北唐山 063299
[ "王孟依 男,1998年6月生,河北唐山人.2020年在中国地质大学(武汉)获学士学位.现为武汉大学电子信息学院硕士研究生.主要研究方向:索引调制、雷达信号处理.E‑mail:2956199566@qq.com" ]
[ "陈振兴(通讯作者) 男,硕士生导师,1982年10月生,辽宁葫芦岛人.2008和 2012年在韩国国立庆尚大学分别获硕士、博士学位.现就职于中国地质大学(武汉)电子信息工程系.主要研究方向:无线通信、高维信号处理.E‑mail:chenzx@cug.edu.cn" ]
收稿:2020-12-11,
修回:2021-02-14,
纸质出版:2021-07-25
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王孟依,陈振兴,陈智慧.基于三级LLR检测的广义零填充三模OFDM索引调制系统研究[J].电子学报,2021,49(07):1291-1297.
WANG Meng‑yi,CHEN Zhen‑xing,CHEN Zhi-hui.Generalization of Zero‑Padded Tri‑Mode OFDM with Index Modulation Based on Three‑Stage LLR Detection[J].ACTA ELECTRONICA SINICA,2021,49(07):1291-1297.
王孟依,陈振兴,陈智慧.基于三级LLR检测的广义零填充三模OFDM索引调制系统研究[J].电子学报,2021,49(07):1291-1297. DOI: 10.12263/DZXB.20201420.
WANG Meng‑yi,CHEN Zhen‑xing,CHEN Zhi-hui.Generalization of Zero‑Padded Tri‑Mode OFDM with Index Modulation Based on Three‑Stage LLR Detection[J].ACTA ELECTRONICA SINICA,2021,49(07):1291-1297. DOI: 10.12263/DZXB.20201420.
本文提出了一种基于对数似然比(LLR)检测算法的广义零填充三模正交频分复用(OFDM)索引调制(GZTM‑OFDM‑IM)系统,目的在于提高传统ZTM‑OFDM‑IM系统的频谱效率(SE).在提出的系统发送端,更多的OFDM子载波激活样式有效提高了系统的SE,并且一种新的双模信号星座图被采用.为了降低接收端检测过程的复杂度,设计了基于LLR算法的三级检测器.仿真结果表明:利用设计的低复杂度检测器,GZTM‑OFDM‑IM在实现了高SE的同时,系统的误比特率(BER)性能在高信噪比(SNR)范围与传统ZTM‑OFDM‑IM相比没有降低,且BER性能与理论差错性能上边界非常接近.
In this paper
we propose a generalization of zero‑padded tri‑mode orthogonal frequency division multiplexing with index modulation (GZTM‑OFDM‑IM) system based on the log‑likelihood ratio (LLR) detection. In the proposed system
a dual‑mode signal constellation is designed and applied
and a three‑stage detector based on LLR algorithm is applied for the receiver. Due to more index activation patterns produced in the transmitter
spectral efficiency (SE) of the proposed system is efficiently improved compared with the traditional ZTM‑OFDM‑IM system. Simulation results show that the GTM‑OFDM‑IM system has higher SE than the corresponding ZTM‑OFDM‑IM
and maintains the bit error rate (BER) performance depending on the proposed detection algorithm with low computational complexity. And theoretical BER upper bound of the proposed system is fit to the simulation results at the high signal‑to‑noise ratio (SNR) region.
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