基于多項式擬合的二維OFDM信道估計算法
Two-Dimensional Channel Estimation for OFDM Systems Based on Polynomial Fitting
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摘要: 該文提出了一種內(nèi)插導頻的二維信道估計算法，用于無線移動信道下的正交頻分復用(OFDM)系統(tǒng)。該算法能夠適用于矩形內(nèi)插的導頻信號內(nèi)插方式，相比于梳狀內(nèi)插的導頻信號內(nèi)插方式，矩形內(nèi)插具有更高的數(shù)據(jù)傳輸效率。與已有線性最小均方差(LMMSE)信道估計方法相比，該算法簡單并且不需要預先知道信道相關矩陣以及信噪比等信道信息。仿真結果表明，在各種的衰落環(huán)境下，該算法都有良好的性能。
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關鍵詞:
- OFDM; 信道估計; 時變信道
Abstract: This paper proposes a robust pilot-assisted channel estimation method for Orthogonal Frequency Division Multiplexing(OFDM) signals in Rayleigh fading. The method can be used in rectangular pilot-assisted geometry, which is more efficient than the comb pilot-assisted geometry. Comparing with the Linear Minimum Mean Square Error (LMMSE) channel estimation method, the method is simple and need not know the channel correlation and signal-to-noise (SNR). The performance is presented in terms of bit-error rate(BER) for a system using QPSK and 16QAM in fading channel. -
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