Patent ID: 6754264
Filing Date: 2004-06-22
Classification: H04B,H04L

Abstract:
A digital equalisation method for estimating, from a vector Y of L digital samples of a received signal, discrete symbols of at least one transmitted signal forming part of the components of a vector D of a size N, L and N being integers greater than 1, wherein the vector Y is of the form Y=AD+YN, where A is a matrix of L rows and N columns, determined beforehand from measurements of a response of at least one transmission channel, and YN represents a vector of L noise samples, the method comprising the steps of:determining an upper triangular matrix T of N rows and N columns and a vector Z of a size N such that two quadratic criteria &par;TXâˆ’Z&par;2 and &par;AXâˆ’Y&par;2 are minimum for a same vector X of size N; dividing the vector Z into J blocks Zi (1&lE;i&lE;J) and the matrix T into J(J+1)/2 blocks Ti,j (1&lE;j&lE;i&lE;J), J being an integer greater than 1, the block Zi being made up of Ni components of the vector Z, the Ni's being integers such that &Sum;i=1J&it;â€ƒ&it;Ni=N,and the block Ti,j being made up of Ni rows and Nj columns, in the form: estimating N1 of the discrete symbols as being the components of a vector {circumflex over (D)}1 equal to that of the vectors X1, made up of N1 components taking the different possible values of the discrete symbols, which minimises the quantity &par;T1,1X1âˆ’Z1&par;2.