关键词: 多输入多输出系统, 正交频分复用, 信道估计, 虚拟载波, 子空间估计

Abstract: The convergence speed of traditional subspace-based blind channel estimation is slow and has a good estimating quality only by receiving a large number of signals. Therefore, this paper proposes a VC-based blind channel estimation method in MIMO-OFDM systems. The algorithm is the combination of traditional subspace algorithm and block matrix thought. It extracts a set of vectors to reduce the number of dimensions in OFDM signals and then adds pilot sequence to form a new semi-blind channel estimation method in blind channel estimation method.By computer modeling and simulation, it can be found that newly promoted blind channel estimation method and semi-blind channel estimation method work better in channel estimation and convergence.

Key words: Multiple-Input Multiple-Output（MIMO）, Orthogonal Frequency Division Multiplexing（OFDM）, channel estimation, virtual carrier, subspace channel estimation