Low complexity Rake receivers in ultra-wideband channels

Research output: Contribution to journalArticle


One of the major issues for the design of ultra-wideband (UWB) receivers is the need to recover the signal energy dispersed over many multipath components, while keeping the receiver complexity low. To this aim we consider two schemes for reduced-complexity UWB Rake receivers, both of which combine a subset of the available resolved multipath components. The first method, called partial Rake (PRake), combines the first arriving multipath components. The second is, known as selective Rake (SRake) and combines the instantaneously strongest multipath components. We evaluate and compare the link performance of these Rake receivers in different UWB channels, whose models are based on extensive propagation measurements. We quantify the effect of the channel characteristics on the receiver performance, analyzing in particular the influence of small-scale fading statistics. We find that for dense channels the performance of the simpler PRake receiver is almost as good as that of the SRake receiver, even for a small number of fingers. In sparse channels, however, the SRake outperforms the PRake significantly. We also show that for a fixed transmitted energy there is an optimum transmission bandwidth.


  • Dajana Cassioli
  • Moe Z. Win
  • Francesco Vatalaro
  • Andreas Molisch
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Electrical Engineering, Electronic Engineering, Information Engineering


  • propagation channel, stochastic tapped-delay line model, UWB, partial Rake, selective Rake, reduced complexity Rake receivers
Original languageEnglish
Pages (from-to)1265-1275
JournalIEEE Transactions on Wireless Communications
Issue number4
Publication statusPublished - 2007
Publication categoryResearch