Linear and nonlinear comprehensive precoding method and device for multi-user multiple-input multiple-output (MIMO) system

The invention discloses a linear and nonlinear comprehensive precoding method and a linear and nonlinear comprehensive precoding device for a multi-user multiple-input multiple-output (MIMO) system. The method comprises the following steps of: acquiring the channel state information of each user by using a transmitter; performing linear precoding processing matrix design according to the novel maximum signal-leakage-noise ratio principle of each user; performing geometric mean resolution on an equivalent channel of each user, and acquiring a corresponding user feed-forward processing matrix; extracting the lower triangular part of an equivalent channel matrix after the transformation of a feed-forward matrix and a linear precoding matrix as a feedback processing matrix for nonlinear precoding; and sequentially performing basic processing such as scrambling, modulation and the like, nonlinear dirty paper coding processing, feed-forward matrix processing and linear precoding matrix processing on a signal, and transmitting the processed signal by using the transmitter. By the method and the device, the comprehensive design of linear precoding and the nonlinear precoding is realized, known interference is eliminated, unknown interference is suppressed, the two shortcomings that the known interference is incompletely eliminated and that the gain of each equivalent channel is unbalanced in the linear precoding based on the maximum signal-leakage-noise ratio principle are overcome, and system performance is improved.