基于多項式內(nèi)插的MIMO時間-頻率雙選擇性信道的信道估計

于曉燕; 王加慶; 楊綠溪

基于多項式內(nèi)插的MIMO時間-頻率雙選擇性信道的信道估計

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出版歷程
- 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: 數(shù)據(jù)的高速率傳輸以及終端的高速移動，導(dǎo)致無線通信信道具有時間選擇性與頻率選擇性兩個特征。該文主要研究了數(shù)據(jù)分組傳輸方式下，基于導(dǎo)頻符號輔助調(diào)制(PSAM)的多輸入多輸出(MIMO)時間-頻率雙選擇性信道的信道估計問題。首先，將時間-頻率雙選擇性MIMO信道，建模為一個隨時間變化的多項式內(nèi)插信道模型；然后，根據(jù)信道Doppler衰落速率、多項式模型中的誤差項，確定出模型的階數(shù)以及整個數(shù)據(jù)塊的長度；最后，基于該多項式內(nèi)插信道模型，提出了采用PSAM的MIMO雙選擇性信道估計方法。實驗結(jié)果表明該算法在時間-頻率雙選擇性衰落信道下具有較好的性能。
- MIMO系統(tǒng);導(dǎo)頻符號輔助調(diào)制;雙選擇性信道;信道估計;多項式內(nèi)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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參考文獻(xiàn)(1)

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