Channel estimation method and device in a multi-antenna system

A channel estimation device in a multi-antenna system, comprising:

• a matrix module which is configured to, for each uplink user received by a base station array antenna, first obtain an original channel estimation value for each array element of the array antenna, and then generate a channel estimation matrix using the obtained original channel estimation values, wherein the channel estimation values associated with each array element form a respective row vector of the channel estimation matrix, and the channel estimation values of respective array elements corresponding to a location of each channel estimation tap form a respective column vector of the channel estimation matrix;
• a dividing module which is configured to divide the channel estimation matrix into a channel estimation amplitude matrix and a channel estimation phase matrix;
• a transformation module which is configured to group, in the channel estimation amplitude matrix, the channel estimation values associated with the respective array elements at one corresponding tap location together for signal transformation processing;
• a noise reduction module which is configured to apply a transform domain noise reduction to a high-frequency portion of transform domain data obtained by the signal transformation processing;
• an inverse transformation module which is configured to obtain a noise-reduced channel estimation amplitude matrix by applying an inverse transform to the noise-reduced transform domain data;
• and
• a restoring module which is configured to combine the noise-reduced channel estimation amplitude matrix with the channel estimation phase matrix into a restored channel estimation matrix, wherein the amplitude of each channel estimation value of the restored channel estimation matrix has undertaken a multi-antenna transform domain noise reduction process.