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AssigneeRohde & Schwarz GmbH & Co. KG
InventorsGregor FELDHAUS, Hagen Eckert
Estimating the term…
A method and a system for the detection and/or removal of sinusoidal interference signals in/from a noise signal transforms a measured signal (x(t), x(μ·Δt)) composed of a limited number of sinusoidal interference signals (Ak·ej(ωkt+φk), Ak·ej(μ·ωkΔt+φk)) and a white noise signal (w(t), w(μ·Δt) into a subspace containing its white noise components and a subspace containing its interference signal components. Following this, the individual sinusoidal interference signals (Ak·ej(ωkt+φk), Ak·ej(μ·ωkΔt+φk)) are determined using an estimation method within the subspace containing the noise components. The entire frequency range is split into several frequency bands (v), in which the measured signal (x(t), x(μ·Δt)) consists of a limited number (p(v)) of sinusoidal interference signals (Ak·ej(ωkt+φk), Ak·ej(μ·ωkΔt+φk)) and a white noise signal (w(t), w(μ·Δt)).
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System for the identification of sinusoidal interference signals from a noise signal with a unit for the estimation (51, 52, . . . , 5NFFT) of an autocorrelation matrix ({circumflex over (R)}v) of a measured signal (x(t), x(μ·Δt)), composed from the sinusoidal interference signals (Ak·ej(ωkt+φk), Ak·ej(μ·ωkΔt+φk)) and the noise signal (w(t), w(μ·Δt)), a unit (81, 82, . . . , 8NFFT) for frequency estimation and a unit (91, 92, . . . , 9NFFT) for power-level determination of the spectral lines associated with the sinusoidal interference signals (Ak·ej(ωkt+φk), Ak·ej(μ·ωkΔt+φk)), wherein a Fast Fourier Transform filter bank (1) is additionally provided for the generation of several frequency bands (v) for the measured signal (x(t), x(μ·Δt)), composed of the sinusoidal interference signals (Ak·ej(ωkt+φk), Ak·ej(μ·ωkΔt+φk)) and the noise signal (w(t), w(μ·Δt)).
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System for the removal of sinusoidal interference signals from a noise signal with a unit (51′, 52′, . . . , 5NFFT′) for the estimation of the autocorrelation matrix ({circumflex over (R)}v) and a unit (71′, 72′, . . . , 7NFFT′) for the calculation of the noise power (σw,v) wherein an additional Fast Fourier Transform filter bank (1′) for the generation of several frequency bands (v) is provided for the measured signal (x(t), x(μ·Δt)) composed of the sinusoidal interference signals (Ak·ej(ωkt+φk), Ak·ej(μ·ωkΔt+φk)) and the noise signal (w(t), w(μ·Δt)).
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