APPARATUS, METHOD AND COMPUTER PROGRAM PRODUCT PROVIDING SOFT DECISION GENERATION WITH LATTICE REDUCTION AIDED MIMO DETECTION

摘要

A circuit that includes an input for coupling to a MTMO signal received from a channel to compute a change of basis matrix T and a reduced lattice basis matrix HT, to form a list L of points used for soft decision calculation using columns of the matrix HT and to perform MTMO detection for each point in the list L. The circuit further includes an output to output a list C of constellation points to a unit for use in to calculating soft bit decisions. The listX may include a received point r and a set of points that are formed by adding to the point r a column of the matrix HT multiplied by +1, -1, +i, or -i, or it may be formed by performing hard MIMO detection for the received point r, and adding the columns of HT to the to the hard decision point, or it may be formed by using.a hard decision estimate of transmitted vector x and adding multiplied columns of Hie matrix T to the vector x.