一种基于小波变换的LTE系统下行链路信道估计算法

摘要

Since the noise has great impact on the least-squares method of channel estimation in the LTE （ long term evolution） orth channel estimation algorithm, a new ogonal frequency division multiplexing downlink transmission system was proposed. After the least-squares channel estimation, the method gave the channel estimation through wavelet threshold eleminating noise and combining wavelet decomposition and improved time-domain windows. Simulation results show that the method can eliminate the additive white Gaussian noise effectively, and it can track the changes of channel better and improve the channel estimation accuracy.%针对LTE下行正交频分复用（OFDM）系统中噪声对最小二乘信道估计算法影响较大的问题，给出了一种基于小波分解的信道估计方法。该方法通过在最小二乘（LS）估计之后通过小波阈值去噪，再加入改进的时域加窗相结合的方法进行信道估计。仿真结果表明，该方法能够有效消除加性高斯自噪声，可以更好地跟踪信道变化，提高信道估计精度。