关键词: 正交频分复用, 信道估计, 判决反馈, 纠错编码

Abstract:

The OFDM channel estimation method base on decision feedback is analysed and correction capability of forward correction coding is applied to improve the performance of decision feedback method,and the channel estimation method base on coding feedback is proposed.Decoding and encoding modules are introduced into the decision-feedback loop,and the value of channel estimation is filter processed in the time domain,and finally frequency response of the channel is obtained by the FFT.In this way,the interference between subcarriers and impact of Gaussian white noise on the channel estimation could been reduced.The experimental results show that the new method can effectively reduce the cumulative error of judgments effectively and improve the BER performance of system in the condition of using less training symbols.

Key words: orthogonal frequency division multiplexing;channel estimation;decision feedback;correction coding