Patent ID: 6631160
Filing Date: 2003-10-07
Classification: H04L

Abstract:
A method for processing received signals having been transmitted via a transmission channel, the method comprising the step of:subjecting said received signals to an estimation of a channel impulse response function of said transmission channel, wherein said estimation is based on a Linear-Minimum-Square-Mean-Error-processing using a training sequence transmitted together with received samples contained in said received signals, wherein said estimation is further based on a noise and interference energy estimate represented by a noise variance value as well as an impulse response energy distribution estimate represented by an estimated parameter covariance matrix for said transmission channel, and wherein said estimation of said channel impulse response function (h) is based on a simplified LMMSE estimation according to the equation h=(&dgr;2Chhâˆ’1+XHX)âˆ’1XHy whereinh denotes the channel impulse response function in vector representation, &dgr;2 denotes the noise variance value of a starting point linear model, Chh is the estimated parameter covariance matrix, X is a symbol sequence matrix containing information regarding the training sequence, y denotes the received signal in vector representation, wherein an operator â€œâˆ’1â€  denotes a respective inverse matrix (such that for a matrix M a relation M*Mâˆ’1=E is satisfied, with E representing a unit matrix), and an operator â€œHâ€  denotes a complex conjugate transposition of a matrix.