The invention provides an
MIMO-OFDM
system channel
estimation method based on
compressed sensing. The
MIMO-OFDM
system channel
estimation method based on
compressed sensing is mainly applied to channel
estimation when a receiving terminal is provided with a two-dimensional
antenna array. According to the
MIMO-OFDM
system channel estimation method based on
compressed sensing, the time
delay, incidence angle and
gain of each path of a space channel are estimated in sequence, and channel estimation accuracy can be improved effectively. The MIMO-OFDM system channel estimation method based on compressed sensing comprises the following steps that 1, an initially-estimated value of a channel
frequency domain response vector of each
pilot frequency sub-carrier is obtained according to the least square criterion; 2, by means of the sparsity of the channel
frequency domain response vectors in a time
delay domain, the time
delay of each path of the channel and an estimated value of a channel
time domain response vector of each path of the channel are estimated on the basis of the compressed sensing theory; 3, by means of the sparsity of the channel
time domain response vectors in a two-dimensional angle domain, the incidence angle of each path of the channel is estimated on the basis of the compressed sensing theory; 4, the
gain coefficient of each path of the channel is estimated according to the least square criterion; 5, estimated values of channel
frequency domain responses of all the sub-carriers and antennas are obtained.