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A Parameter Estimation Method Based on Undersampling Bi-phase Coded Signal

A bi-phase encoding and parameter estimation technology, which is applied in the field of parameter estimation of bi-phase encoding signals, can solve the problem of high sampling rate and achieve the effect of reducing pressure

Active Publication Date: 2020-10-02
HARBIN INST OF TECH
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  • Description
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  • Application Information

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Problems solved by technology

[0016] The purpose of the present invention is to propose a parameter estimation method based on an undersampled bi-phase encoded signal in order to solve the problem of the existing sampling rate being too high

Method used

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  • A Parameter Estimation Method Based on Undersampling Bi-phase Coded Signal

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specific Embodiment approach 1

[0033] Specific embodiment one: a kind of parameter estimation method based on the bi-phase encoded signal of subsampling comprises the following steps:

[0034] Aiming at the parameter estimation problem of BPSK signal, the present invention proposes an under-sampling method based on multi-channel parallel structure. The sampling structure proposed by the method of the present invention has two parts, the channel α and the channel β, which respectively realize the estimation of different parameters of the signal. The signal is multiplied by the signal in channel α to remove the modulation information, and then sampled at a low speed by the dual-channel delay sampling structure, and the signal amplitude and carrier frequency are estimated by using the rotated subspace invariant (ESPRIT) algorithm. After the signal is filtered by a low-pass filter in channel β, it is sampled at a low speed. Combined with the carrier frequency information estimated by channel α, the position and...

specific Embodiment approach 2

[0040] Specific embodiment two: the difference between this embodiment and specific embodiment one is: the expression of the signal y(t) in the step one is:

[0041]

[0042] where A is the amplitude of the signal x(t), t is the time, τ is the duration of the signal, j is the imaginary unit, is the initial phase of the signal, K is the number of segments separated by the signal x(t) due to phase jump; ξ k (t) is an intermediate variable, ξ k (t)=u(t-t k )-u(t-t k+1 ), 0≤t 1 K+1 k is the position of the discontinuity point caused by the phase mutation;

[0043] For bi-phase encoded signals, c k takes the value 0 or 1, so y(t) is written as:

[0044]

[0045] Among them, the intermediate variable It can be seen that self-multiplication removes the modulation information of the signal x(t), and y(t) can be regarded as a complex exponential signal.

[0046] Other steps and parameters are the same as those in Embodiment 1.

specific Embodiment approach 3

[0047] Specific implementation mode three: the difference between this implementation mode and specific implementation mode one or two is: in the step two, y[n] and y e The expression of [n] is:

[0048]

[0049]

[0050] Other steps and parameters are the same as those in Embodiment 1 or Embodiment 2.

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Abstract

The invention relates to a parameter estimation method based on an undersampled two-phase coded signal and relates to a parameter estimation method of a two-phase coded signal. In order to solve the existing problem of excessive sampling rate, a multi-channel parallel sampling system proposed by the invention can realize undersampling of a BPSK signal, and the lowest equivalent sampling rate can only be formula, which can accurately estimate the signal parameter; when the signal frequency is very high, the sampling method of the present invention can perform sampling and parameter estimation at a rate much smaller than the Nyquist sampling frequency, which can greatly reduce the pressure of a sampling device; for a band-limited signal of bandwidth B, the sampling rate of the present invention is formula multiples of the Nyquist sampling rate; for a non-band-limited signal, Nyquist sampling theoretically fails to achieve sampling without information loss. The sampling rate of the present invention is formula; and the parameter estimation method based on an undersampled two-phase coded signal is applied to the field of communication signal processing.

Description

technical field [0001] The invention relates to the field of communication signal processing, in particular to a parameter estimation method based on under-sampled bi-phase coded signals. Background technique [0002] Binary Phase Shift Keying (Binary Phase Shift Keying, BPSK) belongs to phase modulation, which is an important type of digital modulation. It is widely used in pulse compression radar and can obtain a large time-width-bandwidth product. At the same time, the signal is also widely used in digital communication systems. Estimation of BPSK signal parameters is the premise and basis for decoding the signal. Therefore, the parameter estimation method for BPSK signal has high research value. [0003] Many scholars have shown great interest in parameter estimation of BPSK signals, and many parameter estimation methods for BPSK signals have appeared. In 1983, Veter A J and Veterbi AM proposed the method of maximum likelihood estimation. A series of carrier frequenc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/20H04L27/26
CPCH04L27/2032H04L27/264H04L27/2695
Inventor 付宁邓立宝曹杰黄国兴乔立岩
Owner HARBIN INST OF TECH
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