一種基于二維處理的OFDM信道估計(jì)算法
A Two Dimensional Processing Based Channel Estimation Method for Wireless OFDM Systems
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摘要: 該文提出了一種新的信道估計(jì)算法，用于無線移動信道下的正交頻分復(fù)用(OFDM)系統(tǒng)。該算法對接收的導(dǎo)頻信號(Pilot)分別在多徑展寬域和多普勒展寬域進(jìn)行處理，顯著地降低了子載波間干擾和高斯白噪聲的影響。此外，多普勒展寬域處理的濾波器是動態(tài)設(shè)計(jì)的，具有良好的自適應(yīng)性。仿真結(jié)果表明，在不同的多普勒頻偏下，該算法都有良好的性能。
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關(guān)鍵詞:
- OFDM; 信道估計(jì); 導(dǎo)頻信號; 多徑展寬; 多普勒展寬
Abstract: This paper proposes a novel channel estimation method for wireless Orthogonal Frequency Division Multiplexing (OFDM) systems. The method can significantly reduce the Inter-Carrier Interference (ICI) and additive white Gaussian noise by processing the received pilots both in multipath spread domain and Doppier spread domain. Furthermore, the method is adaptive in the sense that the cutoff frequency of the filter in the Doppier spread domain is designed dynamically to match the Signal-to-Noise Ratio (SNR). Computer simulation results demonstrate that the proposed method performs well at various Doppier frequency shifts. -
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