Pre-coding method, pre-decoding method, transmitter and mobile terminal based on interference alignment

摘要

The transmitter and a mobile terminal based on interference alignment use pre-coding and pre-decoding methods. An antenna mapping matrix is computed according to a downlink channel state information, wherein the antenna mapping matrix is used for antenna mapping for the current transmitter to perform interference alignment. A multi-cell pre-coding matrix according to the downlink channel state information and the antenna mapping matrix; a single cell multi-user pre-coding matrix and pre-coding user data using the single cell multi-user pre-coding matrix and the multi-cell pre-decoding matrix and performing an antenna mapping using the antenna mapping matrix are computed. A system which cannot use the interference alignment method directly may be transformed to use the interference alignment method directly. In addition, the interference suppression between cells and the interference management inside cells are two separate processes, in which different linear pre-coding and decoding methods may be used.

主权项

1. A pre-coding method using an interference alignment scheme, the method comprising:
computing an antenna mapping matrix using downlink channel state information matrices of channels between a current transmitter and terminals within a cell covered by the current transmitter, wherein the antenna mapping matrix is used for antenna mapping for the current transmitter so as to perform an interference alignment scheme; computing a multi-cell pre-coding matrix for the current transmitter and a multi-cell decoding matrix for each of a plurality of terminals within a coordinating cell using the downlink channel state information matrices of the channels between the current transmitter and the terminals within the coordinating cell and using the antenna mapping matrix; computing a single cell multi-user pre-coding matrix for the current transmitter using the downlink channel state information matrices of the channels between the current transmitter and the terminals within the cell covered by the current transmitter, the antenna mapping matrix, a multi-cell pre-decoding matrix, and the multi-cell decoding matrices for the terminals within the cell covered by the current transmitter, wherein the multi-cell decoding matrices are received from a transmitter of the coordinating cell; and pre-coding user data using the single cell multi-user pre-coding matrix and the multi-cell pre-decoding matrix, and performing an antenna mapping for the pre-coded user data using the antenna mapping matrix.