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Spectral shaping of UWB signals for time-hopping impulse radio

  • YP Nakache
  • Andreas Molisch
Publiceringsår: 2006
Språk: Engelska
Sidor: 738-744
Publikation/Tidskrift/Serie: IEEE Journal on Selected Areas in Communications
Volym: 24
Nummer: 4
Dokumenttyp: Artikel i tidskrift
Förlag: IEEE--Institute of Electrical and Electronics Engineers Inc.


This paper studies the design of signaling waveforms for time-hopping impulse radio (TH-IR) with limits on the power spectral density. Such restrictions are imposed by the spectral mask prescribed by frequency regulators for ultra-wideband (UWB) signals. The "conventional" TH-IR system with pulse-position modulation and time-hopping multiple access gives rise to spectral lines that either violate the regulations, or require a significant power backoff. To remedy this situation, we propose the use of polarity randomization, which eliminates the spectral lines and also leads to a smoothing of the continuous part of the spectrum. We analyze different variants of the polarity randomization, considering short and long randomization sequences, as well as symbol-based or pulse-based randomization. We analyze the effect of this technique on both pulse position modulation and binary phase-shift keying modulation.


  • Electrical Engineering, Electronic Engineering, Information Engineering
  • spectral lines
  • polarity randomization
  • power spectral density
  • time-hopping impulse radio (TH-IR)


  • ISSN: 1558-0008

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