Method and system for MIMO channel information feedback

A terminal supporting Multiple Input Multiple Output (MIMO) for feeding back MIMO channel information, comprising:

• a feedback module, which is configured to:
• feed back channel information to a base station in a channel Rank information (RI)/Precoding Matrix Indicator (PMI)/Channel Quality Indicator (CQI) mode, and select one or more columns from a codebook matrix W corresponding to the PMI according to certain rules and mark the one or more columns as a part of column vectors Wpart, obtain the information O for representing the part of column vectors Wpart with high-precision vector quantification information, and feed back the information O to the base station,
• wherein, the feedback module is configured to:
• obtain the information O using the part of column vectors Wpart according to a common representation relationship F, wherein, the common representation relationship F is a mapping relationship, and
• wherein, the feedback module is configured to obtain the information O for representing the part of column vectors Wpart with the high-precision vector quantification information in the following way:
• the terminal defining a codebook C around the part of column vectors Wpart according to the mapping relationship F and taking an index of the codebook C as the information O.

A base station supporting Multiple Input Multiple Output (MIMO), comprising:

• a receiving module, which is configured to:
• receive channel information fed back to the base station by a terminal supporting MIMO in a channel Rank information (RI)/Precoding Matrix Indicator (PMI)/Channel Quality Indicator (CQI) mode, and receive information O fed back to the base station by the terminal, wherein, the information O is information for representing part of column vectors Wpart with high-precision vector quantification information obtained after the terminal selects one or more columns from a codebook matrix W corresponding to the PMI according to certain rules and marks the one or more columns as the part of column vectors Wpart;
• and,
• a quantification information obtaining module, which is configured to find out the part of column vectors Wpart from the codebook matrix W corresponding to the received PMI, and obtain the high-precision vector quantitative information used for MIMO using the Wpart and the received information O according to a common representation relationship F,
• wherein, the common representation relationship F is a mapping relationship, and wherein, the information O is obtained in the following way:
• the terminal defining a codebook C around the part of column vectors Wpart according to the mapping relationship F and taking an index of the codebook C as the information O.