分布式MIMO-OFDM信号多频偏多信道联合盲估计

doi:10.11772/j.issn.1001-9081.2015.06.1531

计算机应用 ›› 2015, Vol. 35 ›› Issue (6): 1531-1536.DOI: 10.11772/j.issn.1001-9081.2015.06.1531

分布式MIMO-OFDM信号多频偏多信道联合盲估计

黄艳艳, 彭华

信息工程大学, 郑州 450002

收稿日期:2014-12-22 修回日期:2015-04-10 发布日期:2015-06-12
通讯作者: 黄艳艳(1986-),女,浙江乐清人,博士研究生,主要研究方向:分布式MIMO-OFDM系统的参数估计及均衡;18638575039@163.com
作者简介:彭华(1973-),男,江西萍乡人,教授,博士,主要研究方向:通信信号处理、软件无线电。
基金资助:
国家自然科学基金资助项目(61401511)。

Joint blind estimation of multiple frequency offsets and multiple channels for distributed MIMO-OFDM systems

HUANG Yanyan, PENG Hua

Information Engineering University, Zhengzhou Henan 450002, China

Received:2014-12-22 Revised:2015-04-10 Published:2015-06-12

摘要/Abstract

摘要：

针对多径衰落信道下分布式多输入多输出正交频分复用(MIMO-OFDM)系统中频偏信道联合盲估计难的问题,提出了一种有效的多频偏多信道联合盲估计方法。该算法利用盲解卷积分离算法接收信号的同时得到有频偏影响的多个信道,对分离后的多个信号进行逐个频偏估计,补偿整体信道并去除信道模糊度,得到有效的信道估计值。仿真结果表明,与基于导频的频偏信道估计方法相比,所提算法可在5 dB获得1e-6的频偏估计精度,在15 dB左右获得1e-2的信道估计精度,实现了分布式MIMO-OFDM信号的多频偏多信道联合盲估计。

关键词: 分布式多输入多输出正交频分复用, 多频偏多信道, 盲源分离, 盲估计, 模糊度

Abstract:

Joint blind estimation of multiple frequency offsets and multiple channels is difficult in distributed Multiple Input Multiple Output Orthogonal Frequency Division Multiplexing (MIMO-OFDM) system under the multipath fading channel. In order to solve the problem, an effective algorithm was proposed. The proposed algorithm made use of blind deconvolution separation method to receive signal and got the multiple channels embedded with frequency offsets meanwhile. After estimating frequency offsets of the separated signals, the real channels estimation could be obtained by removing channel ambiguity and compensating the whole channels. The simulation results show that, the proposed algorithm is able to get 1e-6 average Mean Square Error (MSE) of frequency offsets estimation at 5 dB and 1e-2 average MSE of channels estimation at 15 dB compared with existing frequency offset channel estimation method based on pilot, the joint blind estimation of multiple frequency offsets and multiple channels for distributed MIMO-OFDM signal is realized

Key words: distributed Multiple Input Multiple Output Orthogonal Frequency Division Multiplexing (MIMO-OFDM), multiple frequency offsets and multiple channels, blind source separation, blind estimation, ambiguity

中图分类号:

TN911.7

黄艳艳, 彭华. 分布式MIMO-OFDM信号多频偏多信道联合盲估计[J]. 计算机应用, 2015, 35(6): 1531-1536.

HUANG Yanyan, PENG Hua. Joint blind estimation of multiple frequency offsets and multiple channels for distributed MIMO-OFDM systems[J]. Journal of Computer Applications, 2015, 35(6): 1531-1536.

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分布式MIMO-OFDM信号多频偏多信道联合盲估计

Joint blind estimation of multiple frequency offsets and multiple channels for distributed MIMO-OFDM systems

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