Patent ID: 7388935
Filing Date: 2008-06-17
Classification: H04L

Abstract:
1. A method of computing, in a baseband radio receiver, a least-squares (LS) channel estimate, ĉ, over a sequence of known transmitted symbols given by the equation: where S H S is a Fisher information matrix, r is a vector of received samples, and S is a truncated convolution matrix of the transmitted symbols given by: wherein the information matrix S H S is a nearly Toeplitz matrix based on whitened symbols that are unknown a priori and therefore must be computed in real time, said method comprising the steps of: determining a perturbation matrix (E) in the form of E=ε solving for the inversion (X) of the nearly Toeplitz matrix (S where B is a vector or matrix of dimension n by m, said solving step including the steps of: selecting an initial estimate X iteratively computing estimates of the inversion X through the recursion: and computing said least-squares channel estimate, ĉ, to equalize the received signal using X.