There is provided mechanisms for processing a reception signal r. The method is performed by a receiver. The method comprises receiving a reception signal r representing a sequence of input symbols xn, the reception signal comprising a sequence of pulse forms gT selected from a set of pulse forms. The method comprises generating a set of decoded symbols Formula (I) from the reception symbols by subjecting a set of sampled symbols yn derived from the reception signal to a whitening filter defined by second coefficients K, and to an equalizer defmed by first coefficients R. The first coefficients R and the second coefficients K are selected from respective matrices of a Toeplitz decomposition of a Gram matrix G defmed by the inner product of all pulses in the set of pulse forms. {circumflex over (x)}n  (I)