摘要
提出了一种基于编码的OFDM系统的导频符号迭代辅助信道估计。利用信道解码器中的APP符号来形成虚拟的导频。与原有的信道估计算法相比,此种算法不仅在一般的信道条件下具有良好的性能,而且更加适合快变信道条件下的OFDM系统。仿真结果表明:提出的OFDM信道估计算法不仅可以给出精度较高的信道信息,而且近似达到EM信道估计的性能。
A pilot-symbol-aided iterative channel estimation is proposed for coded OFDM-based systems using the symbol APP provided by the channel decoder to form groups of virtual pilot. The proposed algorithm, compared with the conventional algorithms, provides more accurate channel information not only in slowly time-varying environments, but more important also in fast time-varying environments. The simulation results show that the proposed algorithm can achieve the performance nearly as good as the EM channel estimation in both slowly and fast timevarying fading channels.
出处
《无线电通信技术》
2008年第4期9-10,29,共3页
Radio Communications Technology
关键词
OFDM
信道估计
导频符号
迭代算法
OFDM
channel estimation
pilot symbol
iterative algorithm
