关键词: 多输入多输出－正交频分复用系统, 离散傅里叶变换, 信道估计； 噪声方差估计； 多径时延估计

Abstract:

A new channel estimation algorithm for MIMO-OFDM is proposed. The channel impulse response is estimated by the conventional DFT algorithm. Adaptive channel parameters estimation is proposed 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 results show that the proposed channel estimation gives better performance than conventional LS channel estimation algorithm.

Key words: multiple input multiple output－orthogonal frequency division multiplexing systems, discrete Fourier transform； channel estimation, noise variance estimation, multi-path delay estimation