Method, system, base station and mobile terminal device for collaborative communication

A method for collaborative communication, comprising:

• obtaining Channel State Information (CSI) of a Line of Sight (LOS) signal of a user by eliminating CSI of a multi-path signal in the CSI;
• sending the CSI of the LOS signal of the user to a Base Station (BS), wherein the CSI of the LOS signal of the user is used for the BS to determine a collaborative communication solution;
• and
• receiving communication data sent by the BS.

A Base Station (BS), comprising:

• a channel information receiving unit, configured to receive Channel State Information (CSI) of a Line of Sight (LOS) signal that is obtained by eliminating CSI of a multi-path signal in the CSI and is sent by a user;
• a closed-loop channel information obtaining unit, configured to obtain CSI of a closed-loop user having a channel that is orthogonal to a channel of the user;
• a pre-coding unit, configured to perform pre-coding calculation by using the CSI sent by the user and the CSI of the closed-loop user;
• and
• a sending unit, configured to send communication data after the pre-coding calculation to the user.

A mobile terminal device, comprising:

• a channel information obtaining unit, configured to obtain Channel State Information (CSI) of a user;
• a filtering unit, configured to obtain CSI of a Line of Sight (LOS) signal of the user by eliminating CSI of a multi-path signal in the CSI of the user;
• a sending unit, configured to send the CSI of the LOS signal of the user to a Base Station (BS), wherein the CSI of the LOS signal of the user is used for the BS to determine a collaborative communication solution;
• and
• a receiving unit, configured to receive communication data sent by the BS.