1. A method for configuring codebooks, which is applied in a Long Term Evolution Advanced (LTE-A) system and comprises: a transmitting end selecting a code word restricted sub-set and informing a receiving end of the code word restricted sub-set by sending to the receiving end a signaling carrying a restricted sub-set bitmap, wherein each information bit in the restricted sub-set bitmap is associated with a code word for indicating whether the associated code word belongs to the code word restricted sub-set; the code word restricted sub-set containing part or all of code words in a first codebook and/or a second codebook; and the receiving end selecting an optimal pre-coded code word from the code word restricted sub-set and informing the transmitting end of an index of the optimal pre-coded code word; wherein in the step of the transmitting end selecting the code word restricted sub-set and informing the receiving end of the code word restricted sub-set, the transmitting end configures the restricted sub-set bitmap in one of the following ways: (1) performing sub-set restriction on the code words in the first codebook and the second codebook jointly, wherein a code word in the first codebook and a code word in the second codebook are taken as a code word combination, each code word combination is associated with one information bit in the restricted sub-set bitmap, and the code word restricted sub-set contains code words extracted from the first codebook and code words extracted from the second codebook; (2) performing sub-set restriction only on the code words in the first codebook, wherein each code word in the first codebook is associated with one information bit in the restricted sub-set bitmap, and the code word restricted sub-set contains code words extracted from the first codebook and all code words in the second codebook; (3) performing sub-set restriction only on the code words in the second codebook, wherein each code word in the second codebook is associated with one information bit in the restricted sub-set bitmap, and the code word restricted sub-set contains code words extracted from the second codebook and all code words in the first codebook; and (4) performing sub-set restriction on the code words in the first codebook and the second codebook separately, wherein, each code word in the first codebook and the second codebook is associated with one information bit in the restricted sub-set bitmap, and the code word restricted sub-set contains code words extracted from the first codebook and code words extracted from the second codebook.
1. A method for configuring codebooks, which is applied in a Long Term Evolution Advanced (LTE-A) system and comprises: a transmitting end selecting a code word restricted sub-set and informing a receiving end of the code word restricted sub-set by sending to the receiving end a signaling carrying a restricted sub-set bitmap, wherein each information bit in the restricted sub-set bitmap is associated with a code word for indicating whether the associated code word belongs to the code word restricted sub-set; the code word restricted sub-set containing part or all of code words in a first codebook and/or a second codebook; and the receiving end selecting an optimal pre-coded code word from the code word restricted sub-set and informing the transmitting end of an index of the optimal pre-coded code word; wherein in the step of the transmitting end selecting the code word restricted sub-set and informing the receiving end of the code word restricted sub-set, the transmitting end configures the restricted sub-set bitmap in one of the following ways: (1) performing sub-set restriction on the code words in the first codebook and the second codebook jointly, wherein a code word in the first codebook and a code word in the second codebook are taken as a code word combination, each code word combination is associated with one information bit in the restricted sub-set bitmap, and the code word restricted sub-set contains code words extracted from the first codebook and code words extracted from the second codebook; (2) performing sub-set restriction only on the code words in the first codebook, wherein each code word in the first codebook is associated with one information bit in the restricted sub-set bitmap, and the code word restricted sub-set contains code words extracted from the first codebook and all code words in the second codebook; (3) performing sub-set restriction only on the code words in the second codebook, wherein each code word in the second codebook is associated with one information bit in the restricted sub-set bitmap, and the code word restricted sub-set contains code words extracted from the second codebook and all code words in the first codebook; and (4) performing sub-set restriction on the code words in the first codebook and the second codebook separately, wherein, each code word in the first codebook and the second codebook is associated with one information bit in the restricted sub-set bitmap, and the code word restricted sub-set contains code words extracted from the first codebook and code words extracted from the second codebook. 5. The method according to claim 1 , wherein the restricted sub-set bitmap contains L information bits; when sub-set restriction is performed on the code words in the first codebook and the second codebook jointly, L=2 M+N ; when sub-set restriction is only performed on the code words in the first codebook, L=2 M ; when sub-set restriction is only performed on the code words in the second codebook, L=2 N ; and when sub-set restriction is performed on the code words in the first codebook and the second codebook separately, L=2 M 2 N ; wherein M refers to the number of the code words in the first codebook, and N refers to the number of the code words in the second codebook.