非冗余块预编码MIMO-OFDM系统盲信道估计算法

doi:10.3969/j.issn.1001-2400.2018.04.006

西安电子科技大学学报

非冗余块预编码MIMO-OFDM系统盲信道估计算法

杨若男;楼顺天;张伟涛

(西安电子科技大学电子工程学院，陕西西安 710071)

收稿日期:2017-09-20 出版日期:2018-08-20 发布日期:2018-09-25
作者简介:杨若男(1993-)，女，西安电子科技大学博士研究生，E-mail: rn_yang@163.com
基金资助:
国家自然科学基金资助项目(61571339)

Blind channel estimation for MIMO-OFDM systems via non-redundant block precoding

YANG Ruonan;LOU Shuntian;ZHANG Weitao

(School of Electronic Engineering, Xidian Univ., Xian 710071, China)

Received:2017-09-20 Online:2018-08-20 Published:2018-09-25

摘要/Abstract

摘要：

由于传统的盲信道估计算法靠引入块预编码来弥补子空间方法的缺陷，因此会牺牲一部分符号信息。针对上述问题，提出了一种非冗余块状预编码算法，将发送符号按奇偶成对分块重组，对其进行预编码，相应地接收信号的自相关矩阵具有块状结构，选取对角线上的两个块分别进行信道估计；同时讨论了预编码矩阵应该满足的条件以及预编码矩阵对信道估计和系统误码率的影响，以此设计了一种均衡方法，对两个估计值进行均衡，得到最终的信道估计．仿真表明，该方法可以在获得更好的信道估计效果的同时降低系统的误码率．

关键词: 块预编码, 多进多出正交频分复用, 盲信道估计

Abstract:

The conventional blind channel estimation algorithms for MIMO-OFDM systems use block precoding to avoid the imperfection of subspace methods, which causes the distortion of a part of transmit information. To resolve this problem, a new non-redundant block precoding algorithm is proposed. Transmit signals are reshaped by parity, and then precoded by a block precoder, so that the autocorrelation matrix of receive signals has a block structure. The two diagonal blocks are chosen to obtain channel estimation, respectively. Then conditions the precoder should meet and the impact on the channel estimation and system bits error produced by the precoder are discussed. Based on the discussion, a designed balance operation is applied in the two estimations to obtain the final estimation. Simulation results demonstrate that the block precoding method can lead to a better performance of blind channel estimation while achieving a lower bits error.

Key words: block precoding, multiple-input multiple-output orthogonal frequency division multiplexing, blind channel estimation

杨若男;楼顺天;张伟涛. 非冗余块预编码MIMO-OFDM系统盲信道估计算法[J]. 西安电子科技大学学报, 2018, 45(4): 29-33.

YANG Ruonan;LOU Shuntian;ZHANG Weitao. Blind channel estimation for MIMO-OFDM systems via non-redundant block precoding[J]. Journal of Xidian University, 2018, 45(4): 29-33.

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非冗余块预编码MIMO-OFDM系统盲信道估计算法

Blind channel estimation for MIMO-OFDM systems via non-redundant block precoding

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