基于多项式拟合的二维OFDM信道估计算法
Two-Dimensional Channel Estimation for OFDM Systems Based on Polynomial Fitting
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摘要: 该文提出了一种内插导频的二维信道估计算法，用于无线移动信道下的正交频分复用(OFDM)系统。该算法能够适用于矩形内插的导频信号内插方式，相比于梳状内插的导频信号内插方式，矩形内插具有更高的数据传输效率。与已有线性最小均方差(LMMSE)信道估计方法相比，该算法简单并且不需要预先知道信道相关矩阵以及信噪比等信道信息。仿真结果表明，在各种的衰落环境下，该算法都有良好的性能。
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关键词:
- OFDM; 信道估计; 时变信道
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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