Patent Document ID: 20060052062
Application ID: 11193605
Patent Flag: 0

Claim One:
1. A method for estimation of the channel coefficients (h 0. .. h L ; θ h ) and of the DC offset (d; θ d ) in a digital baseband signal in a radio receiver using a training sequence, comprising: a) generating a received signal vector y from a number of received training sequence data symbols (y(k)) and a number of known training sequence data symbols (t(k)); b) producing a maximum likelihood estimate of a function Λ(θ) which contains the channel coefficients (θ h ) and the DC offset (θ d ), in such a way that a first likelihood function Q h (θ h ; {circumflex over (θ)}′) is produced for the channel coefficients (θ h ), and a second likelihood function Q d (θ d ; {circumflex over (θ)}′) is produced for the DC offset (θ d ); and c) using the SAGE algorithm to produce a convergent sequence of expected values of the first and second likelihood functions Q h (θ h ; {circumflex over (θ)}′) and Q d (θ d ; {circumflex over (θ)}′), respectively, by means of at least one expected value determination step, and at least one maximization step with a parameter vector {circumflex over (θ)}′ comprising initial estimated values of the maximized values {circumflex over (θ)} h ′ and {circumflex over (θ)} d ′.