摘要
为提高MIMO-OFDM系统信道估计的性能,首先通过分析揭示了基于空时分组训练序列的MMSE信道估计器和子空间投影之间的关系。在此基础上,对空时分组训练序列简单得到的LS信道估计器进行子空间投影,得到了复杂度较低同时性能良好的信道估计。为进一步提高性能,最后提出了一种基于FFT的多径时延估计方法,使用该方法可以得到更精确的信道响应信号子空间,从而提高投影估计的性能。计算机仿真证明了所提出算法的有效性。
In order to improve the performance of MIMO-OFDM channel estimation, the connection between MMSE channel estimator and subspace projecting was analyzed in the context of space time block training sequence firstly. Then the LS channel estimator obtained simply by space time block training sequence was projected to the signal subspace to get an estimator that was efficient but of low complexity. To further improve the estimation performance, the multipath delay was estimated by FFT, and then a more accurate channel response signal space was obtained, so the performance of subspace projecting was also improved. The efficiency of the algorithms presented is proved by computer simulations.
出处
《通信学报》
EI
CSCD
北大核心
2006年第6期57-63,共7页
Journal on Communications
