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Reduction of the error floor of binary FSK by nonlinear frequency discriminators

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2 Author(s)
A. F. Molisch ; Tech. Univ., Vienna, Austria ; R. Petrovic

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.

Published in:

IEEE Transactions on Wireless Communications  (Volume:2 ,  Issue: 5 )