  On the basis of a scenario where electron pairing is induced by resonant
two-particle scattering (the Boson Fermion model), we show how precursors of
the superconducting state - in form of overdamped Bogoliubov modes - emerge in
the normal state upon approaching the transition temperature from above. This
result is obtained by a renormalization technique based on continuous unitary
transformations (the flow equations), projecting out the coherent contributions
in the electron spectral function from an incoherent background.
