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

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

doi:10.3969/j.issn.0372-2112.2020.08.005

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

更新时间：2025-07-16

- Improvement of Four-Dimensional Signal Constellations and Corresponding OFDM System Model Design
- Acta Electronica Sinica Vol. 48, Issue 8, Pages: 1486-1492(2020)
- 作者机构：
  
  中国地质大学(武汉)机械与电子信息学院,湖北,武汉,430074
- 作者简介：
- 基金信息：
  
  National Natural Science Foundation of China (No.61401409, No.61771436);Funds for the Central Universities (No.CUGL170211)
- DOI：10.3969/j.issn.0372-2112.2020.08.005
  CLC： TN914.3
- Published Online：25 August 2020，
  
  Published：2020
- 稿件说明：
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ZHANG Xiang-li, WANG Yong, WANG Dian-hong, et al. Improvement of Four-Dimensional Signal Constellations and Corresponding OFDM System Model Design[J]. Acta Electronica Sinica, 2020, 48(8): 1486-1492.
DOI：

ZHANG Xiang-li, WANG Yong, WANG Dian-hong, et al. Improvement of Four-Dimensional Signal Constellations and Corresponding OFDM System Model Design[J]. Acta Electronica Sinica, 2020, 48(8): 1486-1492. DOI： 10.3969/j.issn.0372-2112.2020.08.005.

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.

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.

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