摘要
分析了基于判决反馈的OFDM信道估计方法,并利用前向纠错编码的纠错能力,对判决反馈算法进行了改进,提出了基于编码反馈的信道估计方法。该算法在判决反馈环内引入译码和编码模块,并在时域对信道估计值进行滤波处理,最后进行FFT,得到信道的频率响应。减小子载波之间的干扰和高斯白噪声对信道估计的影响。实验结果表明:新方法在使用较少的训练符号条件下,能够有效地降低判决的累计误差,提高系统的误码率性能。
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.
出处
《电子科技》
2010年第10期56-58,61,共4页
Electronic Science and Technology
关键词
正交频分复用
信道估计
判决反馈
纠错编码
orthogonal frequency division multiplexing
channel estimation
decision feedback
correction coding
