1. A method of generating a processing filter (F) for processing data received in a mobile communication network on multiple branches, the method comprising: determining a covariance (Λ) of noise on the multiple branches; and computing the processing filter (F) based on the noise covariance (Λ), wherein the computation includes a Cholesky decomposition of the noise covariance (Λ) and a matrix inversion based on a result of the Cholesky decomposition, wherein the Cholesky decomposition uses a first numerical representation and the matrix inversion uses a second numerical representation that is more complex than the first numerical representation.