J4 ›› 2013, Vol. 40 ›› Issue (2): 25-30.doi: 10.3969/j.issn.1001-2400.2013.02.005

• 研究论文 • 上一篇    下一篇

SC-FDMA上行系统中一种频域迭代块DFE均衡方法

王秋才1,2;袁超伟1;张金波1;李映雪3
  

  1. (1. 北京邮电大学 信息与通信工程学院,北京  100876;
    2. 长安大学 电子与控制工程学院,陕西 西安  710064;
    3. 北京邮电大学 电子工程学院,北京  100876)
  • 收稿日期:2012-09-13 出版日期:2013-04-20 发布日期:2013-05-22
  • 通讯作者: 王秋才
  • 作者简介:王秋才(1973-),男,副教授,北京邮电大学博士研究生,E-mail: qcwang@chd.edu.cn.
  • 基金资助:

    国家自然科学基金资助项目(60872149)

Frequency domain iterative block DFE for SC-FDMA uplink system

WANG Qiucai1,2;YUAN Chaowei1;ZHANG Jinbo1;LI Yingxue3   

  1. (1. School of Information and Communication Engineering, Beijing Univ. of Posts and Telecommunications, Beijing  100876,China;
    2. School of Electronic and Control Engineering, Chang'an Univ.,Xi'an  710064,China;
    3. School of Electronic Engineering, Beijing Univ. of Posts and Telecommunications, Beijing  100876,China)
  • Received:2012-09-13 Online:2013-04-20 Published:2013-05-22
  • Contact: WANG Qiucai

摘要:

针对多径衰落信道条件下多用户单载波频分多址(SC-FDMA)上行系统中的符号间干扰和多用户间干扰问题,结合分集合并,设计了一种新的多用户SC-FDMA接收结构,并在此基础上提出了一种频域迭代块判决反馈均衡方法.该方法利用输入-判决符号相关系数,优化前馈滤波器和反馈滤波器的抽头系数,使得每次迭代过程中信号的信干噪比最大,逐步消除干扰,提高了数据检测的可靠性.仿真结果表明,该均衡方法有较好的误比特率性能.

关键词: 单载波频分多址, 符号间干扰, 频域, 判决反馈均衡

Abstract:

Focusing on intersymbol interference(ISI) and multiuser interference(MUI) existing in single-carrier frequency-division multiple access(SC-FDMA) in multipath fading channels, a new multiuser receiver based on diversity combining is designed, and a novel frequency domain iterative block decision feedback equalization(DFE) approach for multiuser SC-FDMA is proposed. By exploiting the input-decision correlation, it optimizes the tap coefficients of the feedforward and feedback filters, in such a way that the maximized signal-to-interference-plus-noise ratio(SINR) is achieved for each iterative process, thus removing residual interference, and gradually improving the reliability of the detected data. Simulation results show that the proposed approach effectively reduces the bit error rate(BER) and provides significant robustness against multipath fading.

Key words: single-carrier frequency-division multiple access(SC-FDMA), intersymbol interference(ISI), frequency domain(FD), decision feedback equalization(DFE)