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A Parameter Estimation Method of Multi-tone Interference Based on Three-stage Iteration

A technology of interference parameters and iteration times, applied in the field of communication, can solve the problems of not eliminating the mutual interference between multiple tones, aggravating the mutual interference between multiple single tones, and reducing the DFT fence effect.

Active Publication Date: 2020-09-29
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

[0004] The N-DFT spectrum detection method is simple to implement, but because it cannot overcome the fence effect of DFT, the root mean square error (Root Mean Square Error, RMSE) of frequency estimation will have a large flat layer, and because of the interference of each single tone after windowing The main lobe of the spectrum will widen, so this method will increase the mutual interference between multiple tones; the DFT-MLE iterative estimation method reduces the fence effect of DFT and improves the frequency estimation accuracy through interpolation, but because the interpolation formula is not exact , so its estimation performance is still not high, and because the mutual interference between multiple tones is not eliminated, when the frequency interval between two adjacent tones is small, its parameter estimation performance is poor

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  • A Parameter Estimation Method of Multi-tone Interference Based on Three-stage Iteration
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  • A Parameter Estimation Method of Multi-tone Interference Based on Three-stage Iteration

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[0068] The technical solution of the present invention will be described in detail below in conjunction with the embodiments and the accompanying drawings.

[0069] Let L=8, multi-tone interference signal Among them, A l ,f l , Respectively, the amplitude, frequency and initial phase of the l-th single-tone interference; the received signal after passing through the AWGN channel Where w(t) is zero-mean Gaussian white noise; sampling frequency f s =2048Hz, the number of sampling points N=1024, then the discrete received sampling signal Where n is an integer, and 0≤nl =(k l +δ l )Δf=(k' l +δ' l )Δf′, where, f 0 ~U[0,f s ), the frequency interval between two adjacent tones obeys the uniform distribution of interval (6Δf, 7Δf) or (200Δf, 202Δf), Δf=f s / N=2Hz, Δf'=f s / 2N=1Hz,k l and k' l is an integer, and 0≤k l l l |≤0.5, |δ′ l |≤0.5, w[n] is zero-mean Gaussian white noise with variance σ 2 , the specific steps of the multi-tone interference parameter estima...

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Abstract

The invention belongs to the technical field of communication and relates to a multi-tone interference parameter estimation method based on three-order iteration. The method can accurately estimate amulti-tone interference parameter, and comprises firstly cancelling out the mutual interference between multiple tones by first-order iteration and a three-point interpolation formula so as to obtainthe initial estimated value of the multi-tone interference parameter; then according to the initial estimated value, further cancelling out the mutual interference between the multiple tones by second-order iteration and the three-point interpolation formula so as to obtain a new estimated value; and finally, according to the new estimated value, improving the frequency estimation accuracy by third-order iteration and a two-point interpolation formula to obtain a final estimated value. The method can overcome the mutual interference between multiple tones, and obtain a parameter estimated value that approximates a CRLB, reconstructs an interference signal through the frequency domain, avoids repeated DFT operations in an iterative process, is easy to implement, and has a good application value.

Description

technical field [0001] The invention belongs to the technical field of communication, in particular to a method for estimating parameters of multi-tone interference under the condition of noise. Background technique [0002] In civil and military wireless communication systems, there are a wide variety of interferences, including natural interference and man-made interference. Among them, multi-tone interference, as a typical narrow-band interference method, can seriously damage the communication system, especially the quadrature Frequency division multiplexing (Orthogonal Frequency Division Multiplexing, OFDM) system, multi-tone interference is the superposition of single-tone interference, its parameters include amplitude, initial phase and frequency, through parameter estimation and reconstruction of multi-tone interference, multi-tone interference can be realized In the elimination of interference, frequency estimation is the basis of amplitude and initial phase estimati...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/03H04L27/26
CPCH04L25/03159H04L27/2691H04L2025/03611
Inventor 柏果程郁凡周世阳唐万斌王学哲
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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