一种基于阈值的时域信道估计方法

A Time-domain Channel Estimation Algorithm Based on Threshold

研究了单载波频域均衡(SC-FDE)系统中基于PN码相关的时域信道估计方法,针对该方法低信噪比下信道估计值易受噪声影响的不足,提出了一种基于阈值的时域信道估计方法。该方法利用PN前导估计噪声功率并设置相应的噪声阈值,从而实现对信道估计值的去噪处理。仿真结果表明,该方法能进一步降低信道估计均方误差,在误码率为10-2时,可获得2.5 dB的信噪比增益。

A Time-domain channel estimation algorithm based on PN sequence correlation in Single Carrier Frequency Domain Equalization(SC-FDE)system was studied.Aimed to overcome the deficiencies of the method which can be easily influenced by channel noise when signal to noise ration(SNR) was low,this paper proposed a Time-domain channel estimation algorithm based on noise threshold.This method used the PN sequence to estimate the channel noise power and then set the noise threshold so as to filter out the noise in channel estimation.Simulations results showed that this method can further reduce the Mean Square Error of channel estimation and the SNR can be improved with 2.5 dB when the bit error ration is 10-2.