Comment: Nonlinear SNR amplification of harmonic signal in noise

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Comment: Nonlinear SNR amplification of harmonic signal in noise

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Published

This comment relates to a recently published Letter, which computes the signal-to-noise ratio (SNR) of a harmonic signal in additive noise after transformation by an arbitrary memoryless nonlinearity. According to the authors, with a simple saturating nonlinearity having direct electronic implementation, an amplification of the SNR can be obtained. It is shown here that this computation and the resulting conclusion are not new.

Inspec keywords: information theory; harmonic analysis; amplification; signal processing; noise

Other keywords: signal-to-noise ratio; additive noise; arbitrary memoryless nonlinearity; harmonic signal; nonlinear SNR amplification; simple saturating nonlinearity

Subjects: Signal processing and detection; Information theory; Signal processing theory; Information theory

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