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Compressed sampling method for multiband signal

A signal compression, multi-band technology, applied in electrical components, code conversion and other directions, can solve the problems of limited signal frequency range applicable to multi-coset compression sampling system, low full power bandwidth of analog front end, etc., to avoid low full power bandwidth Effect

Inactive Publication Date: 2015-09-09
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention is to solve the problem that the full power bandwidth of the analog front end of the existing multi-coset compressed sampling system is low, resulting in the limited frequency range of the signal applicable to the multi-coset compressed sampling system, and proposes a multi-band signal compressed sampling method

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  • Compressed sampling method for multiband signal

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specific Embodiment approach 1

[0013] Specific implementation mode 1. Combination figure 1 and figure 2 Describe this embodiment mode, a kind of multi-band signal compression sampling method described in this embodiment mode, the specific steps of this method are: adopt p sampling channels to sample multi-band signal x(t), p is a positive integer; The specific sampling method for each channel 1≤i≤p:

[0014] Step 1. Multi-band signal x(t) and signal M i (t) Perform frequency mixing to obtain the mixed signal

[0015] Step 2. Use the cutoff frequency as f 0 The ideal low-pass filter h(t) of / 2 on the signal filtering; and using an analog-to-digital converter at frequency f s = f 0 Sampling to obtain the sampling sequence y i [n];

[0016] Using the reconstruction algorithm to use the sampling sequence y[n]=(y 1 [n],...,y i [n],...,y p [n]) T Refactor to get the sequence d [ n ] = ( d ...

specific Embodiment approach 2

[0018] Specific embodiment 2. This embodiment is a further description of a multi-band signal compression sampling method described in specific embodiment 1. In this embodiment, the mixing function M of the ith sampling channel i (t)=M(t-c i T nyq ),in, from 0≤c i A set of randomly selected p different integers in ≤m-1; the period of the function M(t) is T 0 =1 / f 0 , whose Fourier series coefficients are and satisfies b l ≠0,l=-L 0 ,...,L 0 .

specific Embodiment approach 3

[0019] Specific Embodiment 3. This embodiment is a further description of a multi-band signal compression sampling method described in Specific Embodiment 1. In this embodiment, y[n]=(y 1 [n],...,y i [n],...,y p [n]) T and d [ n ] = ( d - L 0 [ n ] , · · · , d L 0 [ n ] ) T satisfy the relationship:

[0020] y[n]=Ad[n]

[0021] Among them, A=A 0 D,A 0 In line i, line l+L 0 The elements of the +1 column are The diagonal elements of the diagonal matrix D sati...

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Abstract

The invention discloses a compressed sampling method for a multiband signal, relates to the field of multiband signal sampling, and solves the problem of limitation of a signal frequency application range of a multi-coset compressed sampling system due to low full-power bandwidth of an analog front end of the existing multi-coset compressed sampling system. The method adopts p channels to sample a signal x(t), and a specific sampling method of an ith channel comprises the following steps of carrying out frequency mixing on the multiband signal x(t) and a signal Mi(t) to obtain a signal (FORMULA) after frequency mixing; filtering the signal (FORMULA) by adopting an ideal low-pass filter h(t) with the cut-off frequency of f0 / 2; sampling under the frequency fs=f0 by adopting an analog-digital converter in order to obtain a sampling sequence yi[n]; reconstructing by a reconstruction algorithm through p sampling sequences y[n]=(y1[n] to yi[n] to yp[n]) in order to obtain sequences d[n]=(dL0[n] to dL0[n])<T>, and thereby completing compressed sampling for multiband signal. The compressed sampling method is suitable for sampling the multiband signal with the unknown carrier frequency.

Description

technical field [0001] The invention relates to the field of multi-band signal sampling. Background technique [0002] In the field of wireless communication, each frequency band is allocated to specific authorized users, and unlicensed users cannot use spectrum resources, making spectrum a very precious and limited resource. However, in practical applications, it is found that in the time-frequency plane, there are very few frequency bands that are actually occupied in the entire spectrum in a certain short period of time, and most of the frequency bands are in an idle state. At this time, a multi-band signal is formed. This situation causes a waste of spectrum resources, and at the same time provides the possibility of short-term information transmission for unauthorized users. Unauthorized users cannot occupy the frequency band that authorized users are using, so the occupancy of the frequency band needs to be confirmed before each information transmission. This is the f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M7/30
Inventor 张京超付宁刘佩卓乔立岩彭喜元
Owner HARBIN INST OF TECH
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