Patent ID: 7636406
Filing Date: 2009-12-22
Classification: H04L

Abstract:
1. A method of obtaining a plurality of received signals in a Multiple Input Multiple Output (MIMO) system with K transmission elements and N reception elements, wherein N≧K (N>2, K>1), said method comprising: obtaining a channel coefficients matrix H; obtaining a plurality of K transmission channels; decomposing the channel coefficients matrix H using WB factorization, wherein W is a partial equalization matrix, chosen such that decomposing the channel coefficients matrix H results in a decomposed matrix B that is supplemented with a plurality of non zero diagonals exhibiting a bandwidth b; and running an iterative process for obtaining K received signals while applying a Maximum Likelihood Estimation (MLE) algorithm on all sub-sequence combinations of K transmitted signals according to a transmitted signal vector propagated through the decomposed channel coefficients matrix B and wherein at each iteration stage, i (i={0 . . . K}), a likelihood value is calculated and updated in accordance with a single reduced received signal of index K−i calculated from combination of b transmitted signals of indices i to i+b−1 and a sub-sequence of reduced received signals of indices K−i+1 to K calculated from the combination of transmitted signals of matching indices.