[1]邹应全,等.MIMO-OFDM系统中反馈插值方法和复杂度[J].东南大学学报(自然科学版),2010,40(5):885-889.[doi:10.3969/j.issn.1001-0505.2010.05.001]
 Zou Yingquan,Li Chunguo,et al.Interpolation of beamforming in the reduced feedback of MIMO-OFDM systems[J].Journal of Southeast University (Natural Science Edition),2010,40(5):885-889.[doi:10.3969/j.issn.1001-0505.2010.05.001]
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MIMO-OFDM系统中反馈插值方法和复杂度()
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《东南大学学报(自然科学版)》[ISSN:1001-0505/CN:32-1178/N]

卷:
40
期数:
2010年第5期
页码:
885-889
栏目:
信息与通信工程
出版日期:
2010-09-20

文章信息/Info

Title:
Interpolation of beamforming in the reduced feedback of MIMO-OFDM systems
作者:
邹应全1 2 李春国1 杨绿溪1
1 东南大学信息科学与工程学院,南京 210096; 2 南京信息工程大学电子与信息工程学院,南京 210044
Author(s):
Zou Yingquan1 2 Li Chunguo1 Yang Luxi1
1 School of Information Science and Engineering, Southeast University, Nanjing 210096, China
2 College of Electronic and Information Engineering, Nanjing University of Information Science and Technology, Nanjing 210044, China
关键词:
多输入多输出 正交频分复用 有限反馈 向量插补
Keywords:
MIMO(multiple-input multiple-output) OFDM(orthogonal frequency division multiplexing) feedback beam interpolation
分类号:
TN911
DOI:
10.3969/j.issn.1001-0505.2010.05.001
摘要:
在多输入多输出-正交频分复用(MIMO-OFDM)系统中,为了降低每个子载波在波束形成时的高反馈开销,通过充分利用发射端在某些特定子载波上的信道信息和信道系数在频域的相关性,提出了新的3种波束插补方法,分别为三阶样条插补、变换域插补和低通插值方法. 这些方法只需接收机反馈部分子载波上的波束矢量就能确定其他子载波上的波束矢量,避免了因矢量旋转带来的复杂搜索,降低了角度反馈开销.减小系统反馈量,同时保证较好的性能.仿真结果表明,在频谱利用率、误码性能和反馈量方面,所提方案均优于现有的插补方案.与现有方法相比,在同样反馈量的条件下,所提方法能够获得明显的性能增益.
Abstract:
In order to decrease the feedback overhead caused by the beamforming on every subcarrier in multiple-input multiple-output orthogonal frequency division multiplexing(MIMO-OFDM)systems, the beamforming issue is investigated for the MIMO-OFDM system, where the channel state information on certain subcarriers at the transmitter as well as the feature of the channel correlation in frequency band are fully exploited. By employing some interpolation methods among many beamformers at different carriers, namely, cubic-spline interpolation, zero-padding and DFT(discrete Fourier transform)/IDFT(inverse DFT)interpolation and low-pass interpolation, the system performance can be improved greatly with very small feedback overhead. The numerical results show that the new algorithms acquire proper gain in performance, indicating that the proposed schemes improved the system performances greatly.

参考文献/References:

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[4] Khaled N,Mondal B,Leus G,et al.Interpolation-based multi-mode precoding for MIMO-OFDM systems with limited feedback [J].IEEE Trans on Wireless Communications,2007,6(3):1003-1013.
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备注/Memo

备注/Memo:
作者简介: 邹应全(1976—),男,博士生,讲师; 杨绿溪(联系人),男,博士,教授, 博士生导师,lxyang@seu.edu.cn.
基金项目: 国家重点基础研究发展计划(973计划)资助项目(2007CB310603)、国家自然科学基金资助项目(61071113)、国家科技重大专项资助项目(2009ZX03003-004).
引文格式: 邹应全,李春国,杨绿溪.MIMO-OFDM系统中反馈插值方法和复杂度[J].东南大学学报:自然科学版,2010,40(5):885-889. [doi:10.3969/j.issn.1001-0505.2010.05.001]
更新日期/Last Update: 2010-09-20