The invention discloses a sparse
MIMO-
OFDM channel estimation method based on a space-
time correlation of a channel. Channel
frequency domain responses of different transmit-receive antenna to a
pilot frequency in a received OFDM symbol are estimated; the channel
frequency domain responses of the different transmit-receive antenna to the estimated
pilot frequency are arranged according to a certain rule into a matrix; the matrix is processed through the super-
resolution algorithm so that the multipath time
delay number of the channel can be acquired; the matrix is processed according to the acquired multipath time
delay number, so that multipath
time delays of the channel are acquired; multipath
gain corresponding to a time
delay is acquired according to the acquired multipath
time delays and the acquired matrix of the channel; a channel
frequency domain response to a
subcarrier at data is acquired according to the acquired multipath
time delays and the acquired
gain. In this way, the problem that the number of required
pilot frequencies increases along with the number of antenna in the channel
estimation process in a current
MIMO-OFDM
system is solved; meanwhile, the space-
time correlation of the channel is used for further improving channel
estimation accuracy, remarkably reducing
system pilot frequency spending, and improving spectrum efficiency.