Patent ID: 8861637
Filing Date: 2014-10-14
Classification: H04B,H04L

Abstract:
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.