Method of and apparatus for digital radio signal reception

A receiver is described, for instance for GSM systems, wherein a plurality of digital signals each comprising a training sequence (xp (t)) usable to generate an estimation of the transmission channel are received in diversity (A.1 ... A.N) in the form of a plurality of replicas (10.1 ... 10.N) each comprising a respective replica of the training sequence. The received digital signal is subjected to a delaying action thereby obtaining a plurality of versions of such signal, each comprising a respective set of signal replicas. Each version is subjected to a respective filtering action (23.1 ... 23.N) independently from the other versions, by employing a respective first set of filtering coefficients (w*11 ... w*N1 ... w*Nj) obtained starting from a respective initial set of filtering coefficients. This respective initial set is obtained by performing, for each replica of the received signal, a filtering action exploiting a respective second set of filtering coefficients identified as a signal (u (t)) able to generate, by convolution (u (t) * xp (t)) with the training sequence, a unitary function delta (t) on a given time window, preferably on one bit. The filtering coefficients of the first set are derived starting from said initial set of filtering coefficients through an MMSE adaptation, preferably with a initial rapid convergence phase of the RLS type followed by an optimisation phase of the LMS type.