Linear precoding assisted blind channel estimation for OFDM systems
Linear precoding assisted blind channel estimation for OFDM systems
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DOI：
10.1109/tvt.2005.844681
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发表时间：
2005-05
影响因子：
6.8
通讯作者：
R. Lin;A. Petropulu
中科院分区：
文献类型：
--
作者：
R. Lin;A. Petropulu
我们提出了一种新的用于单发射/接收天线正交频分复用（OFDM）系统的预编码方法，该方法可以实现盲信道估计。在每对数据块进入OFDM系统之前，对其进行非冗余非酉线性预编码器处理。诱导到传输块的结构允许基于简单的互相关操作在接收机上进行盲信道估计。同时，增加了系统的多径分集。针对正交相移键控信号，提出了一种使信道误差最小、误码率渐近最小的最优预编码方案。给出了所提方法的分析性能评价，以及所提信道估计的Cramer-Rao界。
We propose a novel precoding approach for single transmit/receiver antenna orthogonal frequency-division multiplexing (OFDM) systems that enables blind channel estimation. A nonredundant nonunitary linear precoder is applied on each pair of blocks before they enter the OFDM system. The structure induced to the transmitted blocks allows for blind channel estimation at the receiver based on simple cross-correlation operations. At the same time, the multipath diversity of the system is increased. An optimal precoding scheme is pursued that, for quadrature phase-shift keying signals results in minimum channel error and asymptotically minimum bit error rate. Analytic performance evaluation of the proposed approach, and Cramer-Rao bound for the proposed channel estimate, are presented.