摘要
提出了一种利用叠加导频的迭代信道估计算法。将导频信号叠加在发送信号上,利用一阶统计量进行初始信道估计。利用比特交织编码调制(BICM)中迭代译码的硬判决反馈信息,进行迭代信道估计。该算法在不牺牲信息速率的前提下,有效提高了系统带宽利用率。在BICM-OFDM系统中的仿真结果表明,与传统叠加导频算法相比,文章提出的算法可有效提高信道估计精度和系统性能。
An iterative channel estimation algorithm using superimposed pilot is proposed Pilots are added to transmitted signals. The initial estimation employs first-order statistic in this paper. By using the information provided by the hard decision of bit-interleaved coded modulation, the iterative channel estimation is implemented. The proposed algorithm efficiently improves the bandwidth usage without sacrificing the data rate. In BICM-OFDM system, the simulation result show that, as compared to the conventional algorithm, the proposed algorithm efficiently improve the channel estimation accuracy and system performance
出处
《通信技术》
2009年第6期1-4,共4页
Communications Technology
