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Reduction of the error floor of MSK by nonlinear frequency discriminator

  • Andreas Molisch
  • R Petrovic
Publiceringsår: 2003
Språk: Engelska
Sidor: 1101-1107
Publikation/Tidskrift/Serie: IEEE Transactions on Wireless Communications
Volym: 2
Nummer: 5
Dokumenttyp: Artikel i tidskrift
Förlag: IEEE--Institute of Electrical and Electronics Engineers Inc.


We consider the error floor of binary frequency-shift keying (FSK) due to intersymbol interference in time-dispersive mobile radio channels, with a limiter-discriminator-integrator detector. The errors are caused by bursts in the instantaneous frequency. We propose and verify that a nonlinear frequency discriminator can achieve zero error floor for pure FSK by clipping off these bursts. For filtered FSK, the error floor is not completely removed, but strongly reduced - typically by one or two orders of magnitude. The tighter the filtering, the less effective this nonlinearity is. The nonlinear discriminator can also be used in conjunction with adaptive sampling.


  • Electrical Engineering, Electronic Engineering, Information Engineering
  • discriminators
  • dispersive channels
  • frequency shift keying
  • intersymbol interference
  • minimum shift keying
  • mobile radio
  • signal detection


  • ISSN: 1536-1276

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