基于EVD分解的OFDM系统时变信道估计
Channel estimation method for time-varying channels based on eigenvalue decomposition in OFDM systems
丁敬校 1王可人 2金虎2
作者信息
- 1. 电子工程学院,安徽合肥230037;海军指挥学院,江苏南京211800
- 2. 电子工程学院,安徽合肥230037
- 折叠
摘要
OFDM系统中,需要获得信道状态信息实现相干解调.信道的时变性会带来子载波间干扰(ICI),降低信道估计算法的精度.针对信道的快时变性,提出一种基于特征值分解的时变信道估计方法,同时设计一种新的导频结构.该方法利用信道矩阵时域及频域相关性,将信道频域矩阵表示为其特征向量的线性加权,并用贝叶斯模型估计加权系数.仿真结果表明,所提方法能有效降低ICI对系统性能的影响,可较好地满足快时变信道环境的要求.
Abstract
In orthogonal frequency-division multiplexing systems,channel state information is essential for coherent demodulation.The accuracy of channel estimation would be degraded by intercarrier interference (ICI) caused by time-varying character.For time-varying channels,a new channel estimation method based on eigenvalue decomposition was proposed,and a new pilot pattern was also designed.By exploiting the time and frequency correlations of channel taps,the frequency-domain channel matrix can be decomposed by a sum of its eigenvector,then the coefficients were estimated by using a Bayesian.model.Simulation results demonstrate the effectiveness of the proposed channel estimation method in rapidly time-varying scenarios against ICI.
关键词
OFDM/信道估计/时变信道/特征值分解Key words
OFDM/channel estimation/time-varying channel/eigenvalue decomposition (EVD)引用本文复制引用
出版年
2013
NETL
NSTL
维普
万方数据