this invention generally relates to wired and wireless ultra wideband data communications apparatus and methods , and in particular to uwb receiver systems and architectures , and to correlators therefore . an ultra wideband receiver system comprising : a receiver front end to receive a uwb signal having a plurality of multipath components ; and a correlator coupled to said receiver front end to correlate said uwb signal with a reference signal ; and wherein said uwb signal comprises a plurality of pulses ; wherein each said pulse has a plurality of multipath components ; wherein said reference signal comprises a plurality of multipath components of a said pulse ; and wherein said correlator comprises at least one correlator module configured to correlate a plurality of said multipath components of a said pulse with said reference signal .