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Feedback-structure-based multi-harmonic signal under-sampling method and system

A harmonic signal and under-sampling technology, applied in the feedback structure-based multi-harmonic signal under-sampling method and system field, can solve problems such as image frequency aliasing and multi-harmonic signal frequency aliasing, and achieve frequency aliasing , the effect of reducing stress

Active Publication Date: 2018-06-15
HARBIN INST OF TECH
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Problems solved by technology

[0012] The present invention aims at proposing a multi-harmonic signal under-sampling method and system based on a feedback structure for problems such as frequency aliasing and image frequency aliasing that occur in under-sampling of multi-harmonic signals

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[0047] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0048] It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0049] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but not as a limitation of the present invention.

[0050] Such as figure 1 As shown, a multi-harmonic signal undersampling method based on a feedback structu...

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Abstract

The invention, which relates to the field of communication signal processing, discloses a feedback-structure-based multi-harmonic signal under-sampling method and system. The system is formed by two series sampling channels including a main sampling channel and a feedback sampling channel. For a multi-harmonic signals with K frequency components, the main sampling channel obtains 2K samples and estimates a possible solution combination of a frequency parameter and an amplitude parameter based on a Prony algorithm; according to an estimation result, a sampling rate of the feedback channel is generated; and after the feedback sampling channel obtains 2K samples, a possible solution combination of a frequency parameter and an amplitude parameter is estimated based on the Prony algorithm; andwith the estimation results of the two channels, a frequency parameter and an amplitude parameter of a signal are determined jointly. According to the invention, frequency aliasing and mirror image frequency aliasing problems can be solved by only 4K samples; and the parameter estimation accuracy is high and the robustness is strong.

Description

technical field [0001] The invention belongs to the field of communication signal processing, and in particular relates to a multi-harmonic signal under-sampling method and system based on a feedback structure. Background technique [0002] Multi-harmonic signal is a widely used signal in real life, often used in audio, communication and power systems. From the Nyquist sampling theorem we know that in order to fully reconstruct an analog signal from sampled samples, the sampling rate must be greater than or equal to twice the signal bandwidth. As the bandwidth of multiharmonic signals increases, so does the pressure on sampling equipment. Therefore, Nyquist (Nyqiust) sampling theorem has gradually become the bottleneck in the design of multi-harmonic signal sampling system, restricting the development of signal processing technology. [0003] A multiharmonic signal is a signal that can be characterized by a finite number of parameters, namely frequency and amplitude parame...

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Application Information

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IPC IPC(8): G01R23/16
CPCG01R23/16
Inventor 付宁黄国兴曹杰乔立岩
Owner HARBIN INST OF TECH
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