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Joint estimation method of delay and amplitude attenuation in complex noise environment

A technology of joint estimation and amplitude attenuation, which is applied in transmission monitoring, digital transmission systems, electrical components, etc., can solve problems such as strong pulses and Gaussian distribution assumptions that cannot be reflected, and achieve high estimation accuracy and low computational complexity.

Active Publication Date: 2018-10-16
DALIAN UNIV OF TECH
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Problems solved by technology

However, many signals and noises encountered in wireless communication, radar, underwater acoustic and biomedical signal processing often have a strong impulsive nature, and the Gaussian distribution assumption often cannot reflect the actual situation

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  • Joint estimation method of delay and amplitude attenuation in complex noise environment
  • Joint estimation method of delay and amplitude attenuation in complex noise environment
  • Joint estimation method of delay and amplitude attenuation in complex noise environment

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Embodiment Construction

[0022] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention are clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The overall algorithm flow chart is as follows figure 1 shown.

[0023] A joint estimation algorithm of time delay and amplitude attenuation in a complex noise environment, comprising the following steps:

[0024] Firstly, the signal model used in the present invention is introduced. Let the signals received by the two receivers be:

[0025] x 1 (n)=s(n)+v 1 (n)

[0026] x 2 (n)=βs(n-d)+v 1 (n)

[0027] Among them, s(n) is a pure signal, β represents the amplitude attenuation factor of the signal, d represents the time delay between two signals, v 1 (n) and v 2 (n) is the additive noise introduced when receiving.

[0028] In the first step, when the length...

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Abstract

The invention discloses a joint estimation algorithm of delay and amplitude attenuation in a complex noise environment, and belongs to the technical field of radio positioning. The joint estimation algorithm comprises the following steps: 1) setting a search range of the delay and a search step length of the delay in the case of a known received signal length N; 2) using the sinc function as a transverse filter of a weight coefficient, converting the estimation of the delay into the estimation of a finite impulse response (FIR) filter coefficient, and establishing an expression with a delay signal on this basis; 3) figuring out a cost function of joint estimation of amplitude attenuation and delay by using the maximum correlation entropy criterion; 4) establishing an expression of directlyestimating the amplitude attenuation and delay in one step; and 5) performing the joint estimation of delay and amplitude coefficients by using spectral peak search. The invention provides a high-precision adaptive delay estimation algorithm in a complex communication environment in the presence of impulse noise and amplitude attenuation. The algorithm takes an amplitude attenuation factor of a signal as a fixed point of the filter weight coefficient, and directly realizes the joint estimation of the attenuation coefficient and the delay in one step, thereby having important practical significance.

Description

technical field [0001] The invention belongs to the technical field of multi-parameter estimation of radio signals, and relates to a method for estimating the time delay of signals received by two receivers, in particular to a method for jointly estimating time delay and amplitude attenuation in complex noise environments. Background technique [0002] Delay estimation is one of the most widely used positioning technologies in wireless passive positioning. Its basic task is to realize the estimation of the time difference between the arrival of the target source and the two receivers. It has applications in many fields such as radar, sonar, and wireless communication. . [0003] In time delay estimation, generalized cross-correlation and parameter estimation are the two most common estimation methods. For the generalized cross-correlation method, the usual method is to first pass the two received signals and the pre-filter H 1 (f) and H 2 (f), whitening the signal and noi...

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Application Information

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IPC IPC(8): H04B17/364H04L27/26
CPCH04B17/364H04L27/2695
Inventor 邱天爽金芳晓李景春李蓉唱亮
Owner DALIAN UNIV OF TECH
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