基于STBC的MIMO OFDM系统中的I/Q不平衡及CFO的联合均衡策略

赵海军; 李敏; 崔梦天; 李明东

doi:10.3969/j.issn.1000-436x.2013.11.007

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基于STBC的MIMO OFDM系统中的I/Q不平衡及CFO的联合均衡策略

学术论文

- 基于STBC的MIMO OFDM系统中的I/Q不平衡及CFO的联合均衡策略
- Joint equilibrium strategy for I/Q imbalance and CFO in MIMO OFDM system based on STBC
- 通信学报 2013年34卷第11期页码：51-58
- 作者机构：
  
  1. 西华师范大学计算机学院，四川南充 637009
  2. 成都供电公司信息通信分公司，四川成都 610000
  3. 西南民族大学计算机科学与技术学院，四川成都 610041
- 作者简介：
  
  [ "赵海军（1966-），男，四川广安人，硕士，西华师范大学副教授、硕士生导师，主要研究方向为无线通信、网络数据通信及信息处理。" ]
  [ "李敏（1983-），女，四川南充人，硕士，成都供电公司工程师，主要研究方向为电力网络通信及信息系统。" ]
  [ "崔梦天（1972-），女，内蒙古乌兰浩特人，博士，西南民族大学副教授、硕士生导师，主要研究方向为计算机算法及网络通信技术。" ]
  [ "李明东（1958-），男，四川广安人，西华师范大学教授、硕士生导师，主要研究方向为计算机软件及应用技术。" ]
- 基金信息：
  
  国家自然科学基金资助项目(61102007);四川省教育厅自然科学基金资助项目(10ZC012);中央高校基本科研业务费专项基金资助项目(12NZYBS05)
- DOI：10.3969/j.issn.1000-436x.2013.11.007
  中图分类号： TN715
- 网络出版日期：2013-11，
  
  纸质出版日期：2013-11-25
- 稿件说明：
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赵海军, 李敏, 崔梦天, 等. 基于STBC的MIMO OFDM系统中的I/Q不平衡及CFO的联合均衡策略[J]. 通信学报, 2013,34(11):51-58.

Hai-jun ZHAO, Min LI, Meng-tian CUI, et al. Joint equilibrium strategy for I/Q imbalance and CFO in MIMO OFDM system based on STBC[J]. Communication journal, 2013, 34(11): 51-58.
赵海军, 李敏, 崔梦天, 等. 基于STBC的MIMO OFDM系统中的I/Q不平衡及CFO的联合均衡策略[J]. 通信学报, 2013,34(11):51-58. DOI： 10.3969/j.issn.1000-436x.2013.11.007.

Hai-jun ZHAO, Min LI, Meng-tian CUI, et al. Joint equilibrium strategy for I/Q imbalance and CFO in MIMO OFDM system based on STBC[J]. Communication journal, 2013, 34(11): 51-58. DOI： 10.3969/j.issn.1000-436x.2013.11.007.

摘要

基于STBC方案，针对MIMOOFDM通信系统中同时存在发射机和接收机I/Q不平衡、前端滤波器失配、CFO和频率选择性信道失真的组合影响进行了深入研究，并提出了一种适用的联合均衡策略；具体实现是首先通过对MIMO OFDM系统中只存在发射机I/Q不平衡和多径信道干扰的分析，得到一种频域均衡器；然后再考虑同时存在接收机I/Q不平衡和CFO的情况，得到了2个时域均衡器；最后把2个时域均衡器变换到频域，并结合消除发射机I/Q不平衡和多径信道干扰的频域均衡技术，提出了一种全面的联合均衡技术即频域子载波均衡器。仿真结果表明，针对MIMO OFDM系统提出的频域子载波均衡技术不仅能扩展到其他高阶STBC系统，而且使均衡后的系统BER性能得到了明显的提高。

Abstract

Based on the STBC scheme

the combined effect of the transmitter and receiver I/Q imbalance

the front-end filter unmatch

CFO and frequency selective channel distortion for the presence at the same time in MIMO OFDM com-munication system was intensively studied

and an applicable joint equilibrium strategy was also proposed.The concrete implementation is that a frequency domain equalizer was firstly obtained through the analysis of the only presence of the transmitter I/Q imbalance and multipath channel interference in MI OFDM system. And then considering on the si-multaneous presence of receiver I/Q imbalance and CFO

two time domain equalizers were also obtained. Finally

these time domain equalizers were transformed into the frequency domain

combined with frequency domain equilibrium technology to eliminate the transmitter I/Q imbalance multipath channel interference. A comprehensively joint equi-librium technology

namely frequency domain per-tone equalizer

was proposed. The simulation results show that the frequency domain per-tone equilibrium technique for the proposed MIMO OFDM system can be extended to other higher order STBC system

and the BER performance of the system after equilibrium using the osed equilibrium technique is improved obviously.

关键词

Keywords

references

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