摘要
给出了一种适于多输入多输出-正交频分复用(MIMO-OFDM)系统的信道估计方案.该方案首先根据最小二乘准则,利用散布导频估计出MIMO信道的单位冲激响应,然后对此估计值进行时域自适应Wiener滤波以提高估计精度,最后经过离散傅里叶变换得到MIMO信道频率响应用于信道均衡.这一估计方案充分考虑了信道在时域以及频域的相关性,从而估计精度高、性能稳定.同时由于采用的导频符号均布于各发射天线的所有发射时段,因而它能及时跟踪信道的变化.仿真结果表明该方案具有良好的误码率性能,接近于理想信道估计的情况,并且对信道衰落变化较快的环境具有鲁棒性.
A channel estimation scheme for a multi-input multi-output orthogonal frequency-division multiplexing (MIMO-OFDM) system was presented. The scheme makes use of the scatter pilots to estimate the channel impulse response based on least square (LS) criteria. To improve the estimation, performance, an adaptive Wiener filter was applied. The theoretical analysis and numerical results showed that the scheme proposed provides a high precision and a good ability to track the variations of the fading channels; furthermore it requires a low complexity.
出处
《华中科技大学学报(自然科学版)》
EI
CAS
CSCD
北大核心
2005年第9期26-29,共4页
Journal of Huazhong University of Science and Technology(Natural Science Edition)
基金
国家高技术研究发展计划基金资助项目(2003AA123320)
国家自然科学基金资助项目(60332030)