The invention discloses a pre-coding method, a pre-coding
system and a construction method of a pre-coding
code book. A transmitting terminal and a receiving terminal are used for storing the information of the pre-coding
code book together; a
code word is selected from the pre-coding
code book by the receiving terminal according to an estimated channel matrix; the sequence number of the
code word is fed back to the transmitting terminal; and symbol blocks transmitted to the receiving terminal are pre-coded through the
code word by the transmitting terminal according to the code word found by the sequence number, wherein column vectors in at least eight code word vectors or at least eight code word matrixes in the pre-coding code book are obtained on the basis of an eight-dimensional vector selected from an eight-dimensional vector set, and the eight-dimensional vector set is obtained by computing partial or all four-dimensional vectors of u1, u2, u3, u4, u5, u6, u7, u8, s, m and n. The pre-coding method is used for the pre-coding of eight-antenna
MIMO systems when the channel matrix is a
singular matrix, and can enhance the pre-coding property. The four-dimensional vectors used for computing the code word can be stored only for saving storage space.