电子学报 ›› 2020, Vol. 48 ›› Issue (8): 1486-1492.DOI: 10.3969/j.issn.0372-2112.2020.08.005

• 学术论文 • 上一篇    下一篇

四维信号星座图改进及相应OFDM系统模型设计

张祥莉, 王勇, 王典洪, 陈振兴   

  1. 中国地质大学(武汉)机械与电子信息学院, 湖北武汉 430074
  • 收稿日期:2018-12-03 修回日期:2020-02-18 出版日期:2020-08-25 发布日期:2020-08-25
  • 通讯作者: 陈振兴
  • 作者简介:张祥莉 女,1977年8月生,河北邢台人.2005、2013分别在北京航空航天大学、华中科技大学获硕士、博士学位.现为中国地质大学(武汉)电信系副教授.主要从事无线通信发射、接收关键技术方面研究. E-mail:zhangxiangli@cug.edu.cn
  • 基金资助:
    国家自然科学基金(No.61401409,No.61771436);中央高校基金项目(No.CUGL170211)

Improvement of Four-Dimensional Signal Constellations and Corresponding OFDM System Model Design

ZHANG Xiang-li, WANG Yong, WANG Dian-hong, CHEN Zhen-xing   

  1. School of Mechanical Engineering and Electronic Information, China University of Geosciences, Wuhan, Hubei 430074, China
  • Received:2018-12-03 Revised:2020-02-18 Online:2020-08-25 Published:2020-08-25

摘要: 针对当前三维OFDM系统存在的频谱效率较低问题,提出了一种具有规则分布的四维信号星座图改进设计方法,并建立了相应的OFDM系统模型.在所提出的四维OFDM系统中,输入的比特信息通过设计的四维信号星座图映射到OFDM信号的子载波,再利用二维离散傅里叶反变换把OFDM信号从频域调制到时域.所设计的8点和16点四维星座图信号点分布弥补了以往高维星座图信号点无规则的缺陷,具有进一步降低误码率的潜能.通过对提出系统在AWGN和频率选择性衰落信道环境下的性能仿真验证,所提出的基于四维8点和16点OFDM系统比传统三维OFDM具有更优的误码率性能,且系统的频谱效率提高了三分之一.

关键词: 四维信号星座图, 正交频分复用, 二维离散傅里叶反变换, 频谱效率, 误码率

Abstract: In order to improve the spectral efficiency and symbol error rate(SER)of three-dimensional orthogonal frequency division multiplexing(OFDM)system,a simple method for designing four dimensional signal constellations and corresponding OFDM system model based on designed constellations are proposed in this paper.In proposed system,the incoming information bits are mapped through four dimensional signal mapper to each subcarrier of OFDM signals which is represented by two complex number.OFDM signal in the frequency domain is modulated into the time domain using the two-dimensional inverse discrete Fourier transform(IDFT).In addition,both designed 8 points and 16 points four dimensional constellations structure have a certain regular.Simulation results show that the proposed system has better SER performance compared with the corresponding three-dimensional OFDM systems,and the spectral efficiency can also be increased by one third.

Key words: four-dimensional signal constellation, orthogonal frequency division multiplexing(OFDM), two-dimensional inverse discrete Fourier transform(IDFT), spectral efficiency, symbol error rate(SER)

中图分类号: