Discretization in time gives rise to noise-induced improvement of the signal-to-noise ratio in static nonlinearities.
For some nonlinear systems the performance can improve with an increasing noise level. Such noise-induced improvement in static nonlinearities is of great interest for practical applications since many systems can be modeled in that way (e.g., sensors, quantizers, limiters, etc.). We present experimental evidence that noise-induced performance improvement occurs in those systems as a consequence of discretization in time with the achievable signal-to-noise ratio (SNR) gain increasing with decreasing ratio of input noise bandwidth and total measurement bandwidth. By modifying the input noise bandwidth, noise-induced improvement with SNR gain larger than unity is demonstrated in a system where it was not previously thought possible. Our experimental results bring closer two different theoretical models for the same class of nonlinearities and shed light on the behavior of static nonlinear discrete-time systems.
Davidović
A
A
School of Information Technology and Electrical Engineering, University College, The University of New South Wales, Canberra, ACT, 2600, Australia. a.davidovic@adfa.edu.au
Huntington
E H
EH
Frater
M R
MR