Method for estimating a radio channel

摘要

This method for the estimation of a channel between an emitter and a receiver, where the said emitter emits a signal comprising symbol frames distributed in time and frequency, among which pilot symbols known to the receiver, is characterized in that it comprises the following steps: •—computation (30) of a covariance matrix MF and MT of the channel in the frequency and time domains respectively; •—decomposition (32) of the covariance matrices MF and MT into eigenvectors according to the relations MF−WFHNFWF and MT−WTHNTWT; •—computation (34) of the Kronecker product of the matrices NVF and WT to obtain an eigenvector matrix W; •—computation (34) of a diagonal eigenvalue matrix N equal to the Kronecker product of the eigenvalue matrices NF and NT; and •—estimation of the channel with the help of pilot symbols and matrices W and N using the maximum a posteriori or quadratic error minimisation criterion.

主权项

1. A method for the estimation of a radio propagation channel between an emitter and a receiver where the said emitter emits a signal comprising symbol frames distributed in time and frequency, among which some symbols, called pilot symbols, are known to the receiver, wherein the method comprises the following steps performed by the receiver:
computation of a covariance matrix MF of the channel in the frequency domain; computation of a covariance matrix MT of the channel in the time domain; decomposition of covariance matrices MF and MT into eigenvectors according to the relations MF=WFHNFWF and MT=WTHNTWT, in which: WF is an eigenvector matrix of the matrix MF; NF is a diagonal matrix comprising eigenvalues associated with the eigenvectors of the matrix MF; WT is an eigenvector matrix of the matrix MT; NT is a diagonal matrix comprising eigenvalues associated with the eigenvectors of the matrix MT; computation of the Kronecker product of the eigenvector matrices WF and WT to obtain an overall eigenvector matrix W; computation of a diagonal overall eigenvalue matrix N equal to the Kronecker product of the eigenvalue matrices NF and NT; and estimation of the propagation channel with the help of pilot symbols and eigenvector matrices W and eigenvalue matrices N using the maximum a posteriori or quadratic error minimisation criterion.