Wireless communication system, and device and method in wireless communication system

A device in a wireless communication system, comprising:

• a first generating unit configured to generate a first pre-coding matrix according to first channel information on a channel between a first communication apparatus and a second communication apparatus;
• a second generating unit configured to generate a second pre-coding matrix according to the first pre-coding matrix and second channel information on the channel;
• and
• a pre-coding unit configured to pre-code a data signal according to the first pre-coding matrix and the second pre-coding matrix.

A method in a wireless communication system, the method comprising:

• a first generating step of generating a first pre-coding matrix according to first channel information on a channel between a first communication apparatus and a second communication apparatus;
• a second generating step of generating a second pre-coding matrix according to the first pre-coding matrix and second channel information on the channel;
• and
• a pre-coding step of pre-coding a data signal according to the first pre-coding matrix and the second pre-coding matrix.

A device in a wireless communication system, comprising circuitry configured to:

• report first channel information on a channel between a first communication apparatus and a second communication apparatus for the first communication apparatus generating a first pre-coding matrix according to the first channel information;
• report second channel information on the channel for the first communication apparatus generating a second pre-coding matrix according to the first pre-coding matrix and the second channel information;
• and
• acquire a data signal precoded by the first communication apparatus according to the first pre-coding matrix and the second pre-coding matrix.

A method in a wireless communication system, the method comprising:

• reporting first channel information on a channel between a first communication apparatus and a second communication apparatus for the first communication apparatus generating a first pre-coding matrix according to the first channel information;
• reporting second channel information on the channel for the first communication apparatus generating a second pre-coding matrix according to the first pre-coding matrix and the second channel information;
• and
• acquiring a data signal precoded by the first communication apparatus according to the first pre-coding matrix and the second pre-coding matrix.