A method for shared estimation of parameters (.epsilon., .phi., |C.sub.1|, C.sub.0, .alpha., .DELTA..omega.) is described, which together with an error vector e(k), describe the connection between a digitally modulated reference signal inputted to a transmission channel and a received receiver signal z(k) which is at an end of the transmission channel. The method includes the following steps: forming the error vector e(k) in dependence of the parameters (.epsilon., .phi., |C.sub.1|, C.sub.0, .alpha., .DELTA..omega.), a reference signal s(k), and the receiver signal z(k); linearizing the error vector e(k); substituting a real parameter of the linearized error vector through components of a estimation vector, wherein a substituted error vector is produced; inserting the substituted error vector into the cost function; and determining the estimation vector through gradient development of the cost function and subsequently setting the gradient to zero.