基于多项式内插的MIMO时间-频率双选择性信道的信道估计

于晓燕; 王加庆; 杨绿溪

基于多项式内插的MIMO时间-频率双选择性信道的信道估计

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出版历程
- 收稿日期: 2004-09-06
- 修回日期: 2005-10-31
- 刊出日期: 2006-05-19

Doubly Selective Fading Channel Estimation Based on Polynomial Interpolation in MIMO Systems

摘要

摘要: 数据的高速率传输以及终端的高速移动，导致无线通信信道具有时间选择性与频率选择性两个特征。该文主要研究了数据分组传输方式下，基于导频符号辅助调制(PSAM)的多输入多输出(MIMO)时间-频率双选择性信道的信道估计问题。首先，将时间-频率双选择性MIMO信道，建模为一个随时间变化的多项式内插信道模型；然后，根据信道Doppler衰落速率、多项式模型中的误差项，确定出模型的阶数以及整个数据块的长度；最后，基于该多项式内插信道模型，提出了采用PSAM的MIMO双选择性信道估计方法。实验结果表明该算法在时间-频率双选择性衰落信道下具有较好的性能。
- MIMO系统;导频符号辅助调制;双选择性信道;信道估计;多项式内插
Abstract: High data transmission rates and high mobility give rise to time selectivity and frequency selectivity in wireless communication channels. This paper investigates Multi-Input Multi-Output (MIMO) time and frequency doubly selective channel estimation using polynomial interpolation method for data block transmissions. Firstly, a polynomial interpolation model is introduced to represent doubly selective MIMO channel; then, relying on channel Doppler fading rate and the polynomial error term, the polynomial model order and the length of the whole data block are obtained; Finally, based on polynomial interpolation channel model, MIMO doubly selective channels are estimated using pilot symbol assisted modulation. Simulation results show that the proposed estimation method has effective performance.

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