1. A method of generating a processing filter 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 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, wherein the first numerical representation includes a complex value with one exponent common for both a real part and an imaginary part of the complex value; and wherein the second numerical representation includes a complex value with a first exponent for a real part of the complex value and a second exponent for an imaginary part of the complex value.