机构地区: 北京邮电大学电信工程学院信息与通信工程学院
出 处: 《北京邮电大学学报》 2007年第4期116-119,共4页
摘 要: 基于经典的多输入多输出-正交频分复用(MIMO-OFDM)系统离散傅里叶变换(DFT)信道估计方案,提出了一种新的自适应信道参数估计算法,该算法能在一个OFDM导频符号内准确地估计出信道冲激响应、多径时延和噪声方差.首先通过DFT信道估计得到初步估计值;然后提出了联合估计算法估计出各个接收天线上的噪声方差和多径时延,利用多径时延估计值提取信道初步估计中多径点上的信息,有效去除非多径采样点上的噪声.仿真和分析表明,相比传统固定多径数目的估计算法,该算法能自适应地跟踪信道噪声能量和多径时延的变化,提高信道估计的精度. A new channel estimation algorithm for multiple input multiple output-orthogonal frequency division multiplexing (MIMO-OFDM) is proposed. The channel impulse response is estimated by the conventional discrete Fourier transform (DFT) algorithm. Adaptive channel parameters estimation is also presented to estimate the noise variance and multi-path delay profile. The estimation results are used to derive the channel impulse response on the multi-path taps and eliminate the noise on the other taps. Simulation shows that the proposed channel estimation gives better performance than conventional least-squares(LS) channel estimation algorithm.