The invention discloses a
frequency selectivity MIMO (
multiple input multiple output)
system space-time
blind equalizer method based on a MNM (modified Newton method). The method comprises the following steps that firstly, a multimode method and a soft decision guide method are combined for building a cost function; then, a
batch processing mode is adopted, the training sequence length is selected, and the initial value of the
blind equalizer is estimated from the known emitted data and the corresponding observing data by a least square method; a newly provided MNM is utilized for calculating the optimal
equalizer from observing samples; and finally, the
equalizer is utilized for evenly receiving signals, the interference among signals and the interference among codes are eliminated, and resources signals are recovered. The method overcomes the defects that when the exiting MNM is applied to a
MIMO system, the calculation quantity is great, and the
equalization precision of the existing
blind equalization algorithm is low. Compared with the exiting method, the method has the advantages that MNM, MMA and SDD only need little training sample data, and the
equalizer can be enabled to be correctly converged to the optimum MMSE (
minimum mean square error) equalizer.