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Evaluation of signal-to-noise and distortion ratio degradation in nonlinear systems

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3 Author(s)
Lavrador, Pedro Miguel ; Telecommun. Inst., Univ. of Aveiro, Portugal ; de Carvalho, N.B. ; Pedro, Jose Carlos

This paper presents a new figure-of-merit to evaluate signal-to-noise and distortion (SINAD) ratio degradation in nonlinear systems, herein referred to as the noise and distortion figure (NDF). In order to obtain a mathematical formula for this NDF, the best linear approximation calculation is presented for memoryless and dynamic nonlinear systems, which can be modeled by a finite Volterra series. To the best of the authors' knowledge, this is the first time such an attempt of calculating the NDF for a nonlinear and dynamic system is made. NDF results are discussed in both types of systems by means of numerical simulations of systems up to the third order.

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Microwave Theory and Techniques, IEEE Transactions on  (Volume:52 ,  Issue: 3 )