Polynomial-phase signals (PPSs), i.e., signals parameterized as s(t)=A exp(j2πΣm=0M amtm ), have been extensively studied and several algorithms have been proposed to estimate their parameters. From both the application and the theoretical points of view, it is particularly important to know the spectrum of this class of signals. Unfortunately, the spectrum of PPSs of generic order is not known in closed form, except for first- and second-order PPSs. The aim of this letter is to provide an approximate behavior of the spectrum of PPSs of any order. More specifically, we prove that: (i) the spectrum follows a power law behavior f-γ , with γ=(M-2)/(M-1); (ii) the spectrum is symmetric for M even and is strongly asymmetric for M odd; and (iii) the maximum of the spectrum has an upper bound proportional to T(m-1)M/ and, lower bound proportional to T1/2. These results are useful to predict the performance of the so-called high order ambiguity function (HAF) and the Product-HAH (PHAF), specifically introduced to estimate the parameters of PPSs, when applied to multicomponent PPSs

On the spectral properties of polynomial-phase signals / A., Scaglione; Barbarossa, Sergio. - In: IEEE SIGNAL PROCESSING LETTERS. - ISSN 1070-9908. - 5(1998), pp. 237-240. [10.1109/97.712109]

On the spectral properties of polynomial-phase signals

BARBAROSSA, Sergio
1998

Abstract

Polynomial-phase signals (PPSs), i.e., signals parameterized as s(t)=A exp(j2πΣm=0M amtm ), have been extensively studied and several algorithms have been proposed to estimate their parameters. From both the application and the theoretical points of view, it is particularly important to know the spectrum of this class of signals. Unfortunately, the spectrum of PPSs of generic order is not known in closed form, except for first- and second-order PPSs. The aim of this letter is to provide an approximate behavior of the spectrum of PPSs of any order. More specifically, we prove that: (i) the spectrum follows a power law behavior f-γ , with γ=(M-2)/(M-1); (ii) the spectrum is symmetric for M even and is strongly asymmetric for M odd; and (iii) the maximum of the spectrum has an upper bound proportional to T(m-1)M/ and, lower bound proportional to T1/2. These results are useful to predict the performance of the so-called high order ambiguity function (HAF) and the Product-HAH (PHAF), specifically introduced to estimate the parameters of PPSs, when applied to multicomponent PPSs
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11573/17709
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