KR101921095B1 - Wide-band digital receiving apparatus using double compressive sensing - Google Patents

Abstract

Disclosed is a broadband digital reception device using dual compression sensing. The device comprises: a multichannel signal reception module receiving a broadband multichannel signal; and a digital signal reception module dually compressing the multichannel signal, which has been received by the multichannel signal reception module, through each pseudo random binary sequence (PRBS) having different data rates, and then, restoring the dually compressed multichannel signal. According to the broadband digital reception device, since a frequency band is spread through PRBS, broadband signals with a bandwidth, which is dozens of times larger than the conventional Nyquist theory, are simultaneously received and processed. In particular, the device is advantageous in identifying a distinct property of an object in a radar system, and is able to be applied to a function for exploring for a residual frequency band in cognitive radio communication.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a wide-

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates generally to a broadband digital receiving apparatus, and more particularly, to a broadband digital receiving apparatus using dual compression sensing. More specifically, the present invention relates to a broadband digital receiving apparatus using dual compression sensing,

FIG. 1 is a block diagram of a superheterodyne type broadband digital receiving apparatus according to the related art, and FIG. 2 is a frequency spectrum of a broadband signal according to the related art.

Referring first to FIG. 1, a superheterodyne receiver is configured to receive a wideband signal, divide it by frequency, and process the signal. However, the conventional wideband receiver has a limitation on the reception bandwidth by the Nyquist sampling theory. Due to the multi-channel filter bank composed of a local oscillator and a filter for dividing and processing each frequency band, There is a problem that the weight is increased and the consumed power is also considerably consumed.

In a super heterodyne receiver, each frequency band is divided and processed, so that the wider the reception frequency band, the more parts are required.

Also, due to the limitation on the processing bandwidth of the analog-to-digital converter, signals other than the detection band can not be collected.

FIG. 2A is a graph showing a specific reception band search method by switch control. In this case, it can be seen that signals other than the specific search band can not be received. FIG. 2B shows that the IFM receiver is applied, and it is impossible to collect the simultaneous signals.

10-1369202

SUMMARY OF THE INVENTION It is an object of the present invention to provide a broadband digital receiving apparatus using dual compression sensing.

According to an aspect of the present invention, there is provided a broadband digital receiving apparatus using dual compression sensing, including: a multi-channel signal receiving module for receiving a wideband multi-channel signal; And a digital signal receiving module for compressing the multi-channel signal received by the multi-channel signal receiving unit using a pseudo random binary sequence (PRBS) and restoring the compressed multi-channel signal.

Here, the digital signal receiving module may be configured to double-compress the multi-channel signal using PRBS having different data rates, and to recover the double-compressed multi-channel signal.

According to an aspect of the present invention, there is provided a broadband digital receiving apparatus using dual compression sensing, including: a multi-channel signal receiving module for receiving a wideband multi-channel signal; Channel signal received by the multi-channel signal receiving unit using a pseudo random binary sequence (PRBS) having a different data rate, and restoring the double-compressed multi-channel signal, . ≪ / RTI >

At this time, the digital signal receiving module may be configured to recover a dual-compressed multi-channel signal using a complex symmetric matrix for product computation of different PRBSs.

The multi-channel signal receiving module includes a low-noise amplifier for low-noise amplifying a wide-band multi-channel signal received through an antenna; A power divider for distributing low-noise amplified multi-channel signals in the low-noise amplifier; A first PRBS compression unit for compressing the multi-channel signals distributed by the power divider by using a first PRBS (pseudo random binary sequence); A second PRBS compression unit for compressing the multi-channel signal compressed by the first PRBS compression unit using a second PRBS; A low-pass filter for removing an unnecessary signal from the multi-channel signal compressed by the second PRBS compression unit; A loss compensation amplifier for amplifying the multi-channel signal from which the spurious signal is removed in the low-pass filter to compensate for path / conversion loss; And an analog-to-digital converter for converting the multi-channel signal amplified by the loss compensation amplifier into a digital signal.

The digital signal receiving module includes: a data expanding unit for expanding the digital signal converted by the analog-to-digital converter; A spectrum slice detection unit for detecting a threat signal through signal power detection of the digital signal extended in the data extension unit; A signal restoring unit for restoring the threat signal detected by the spectrum slice detecting unit through a measurement matrix inverse calculation; A parameter extracting unit for extracting a parameter of the threat signal restored by the signal restoring unit; And an operator interface unit for outputting the parameters extracted by the parameter extracting unit.

Here, the data extension unit may be configured to expand a digital signal converted by the analog-digital converter to reduce the number of physical channels to generate a virtual channel.

The spectral slice detector may be configured to divide the digital signal extended in the data extension unit into spectral slices and detect signal power in spectral slice units to determine presence / absence of a signal.

The signal restoring unit may be configured to recover the dual-compressed multi-channel signal using a complex symmetric matrix for the multiplication of the first PRBS and the second PRBS.

The parameter extracting unit is configured to generate a pulse description word (PDW) by extracting a pulse width, a pulse arrival time, a pulse period, a frequency, a size, and a modulation characteristic of the threat signal restored by the signal restoring unit .

According to an aspect of the present invention, there is provided a broadband digital receiving apparatus using dual compression sensing, including: a low-noise amplifier for low-noise amplifying a wideband multi-channel signal received through an antenna; A power divider for distributing low-noise amplified multi-channel signals in the low-noise amplifier; A first PRBS compression unit for compressing the multi-channel signals distributed by the power divider by using a first PRBS (pseudo random binary sequence); A second PRBS compression unit for compressing the multi-channel signal compressed by the first PRBS compression unit using a second PRBS; A low-pass filter for removing an unnecessary signal from the multi-channel signal compressed by the second PRBS compression unit; A loss compensation amplifier for amplifying the multi-channel signal from which the spurious signal is removed in the low-pass filter to compensate for path / conversion loss; An analog-to-digital converter for converting the multi-channel signal amplified by the loss compensation amplifier into a digital signal; A data expander for expanding the digital signal converted by the analog-to-digital converter; A spectrum slice detection unit for detecting a threat signal through signal power detection of the digital signal extended in the data extension unit; A signal restoring unit for restoring the threat signal detected by the spectrum slice detecting unit through a measurement matrix inverse calculation; A parameter extracting unit for extracting a parameter of the threat signal restored by the signal restoring unit; And an operator interface unit for outputting the parameters extracted by the parameter extracting unit.

At this time, the data expander may be configured to expand a digital signal converted by the analog-to-digital converter to reduce the number of physical channels to generate a virtual channel.

The spectral slice detector may be configured to divide the digital signal extended in the data extension unit into spectral slices and detect signal power in spectral slice units to determine presence / absence of a signal.

The signal restoring unit may be configured to recover the dual-compressed multi-channel signal using a complex symmetric matrix for the multiplication of the first PRBS and the second PRBS.

The parameter extracting unit is configured to generate a pulse description word (PDW) by extracting a pulse width, a pulse arrival time, a pulse period, a frequency, a size, and a modulation characteristic of the threat signal restored by the signal restoring unit .

According to the broadband digital receiving apparatus using the dual compression sensing described above, the frequency band is spread by using the PRBS, and a wideband signal having a bandwidth several tens of times larger than that of the existing Nyquist theory can be simultaneously received and processed .

Particularly, it is advantageous to grasp intrinsic characteristics of an object in a radar system, and it is also applicable to a function of searching an extra frequency band in cognitive radio communication.

1 is a block diagram of a conventional superheterodyne type broadband digital receiving apparatus.
2 is a frequency spectrum of a conventional wideband signal.
3 is a block diagram of a broadband digital receiving apparatus using dual compression sensing according to an embodiment of the present invention.
4 is a schematic diagram illustrating a signal restoration and parameter extraction process according to an embodiment of the present invention.
5 is a main-frequency spectrum of a PRBS signal according to an embodiment of the present invention.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail to the concrete inventive concept. It should be understood, however, that the invention is not intended to be limited to the particular embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. Like reference numerals are used for like elements in describing each drawing.

The terms first, second, A, B, etc. may be used to describe various elements, but the elements should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component. And / or < / RTI > includes any combination of a plurality of related listed items or any of a plurality of related listed items.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, . On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the terms "comprises" or "having" and the like are used to specify that there is a feature, a number, a step, an operation, an element, a component or a combination thereof described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.

Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 3 is a block diagram of a broadband digital receiving apparatus using dual compression sensing according to an embodiment of the present invention. FIG. 4 is a schematic diagram illustrating a signal restoration and parameter extraction process according to an embodiment of the present invention. Is the dominant frequency spectrum of the PRBS signal according to an embodiment of the present invention.

3, a broadband digital receiving apparatus 100 using dual compression sensing according to an exemplary embodiment of the present invention may include a multi-channel signal receiving module 110 and a digital signal receiving module 120 .

A broadband digital receiving apparatus 100 using dual compression sensing applies a pseudo random binary sequence (PRBS) having different data rates to double-compress a broadband received signal to diffuse the signal, .

It is possible to simultaneously receive and process a wideband signal having a bandwidth several tens of times larger than that of the conventional Nyquist theory.

Hereinafter, the detailed configuration will be described.

The multi-channel signal receiving module 110 may be configured to simultaneously receive a wideband multi-channel signal. Hereinafter, the detailed configuration will be described.

The multi-channel signal receiving module 110 includes a low noise amplifier 111, a power divider 112, a first PRBS compressor 113, a second PRBS compressor 114, a low-pass filter 115, Unit 116, and an analog-to-digital converter (117).

Here, the low-noise amplifier 111 may be configured to low-noise amplify a wide-band multi-channel signal received through the antenna.

The power divider 112 may be configured to distribute low-noise amplified multi-channel signals in the low-noise amplifier 111.

The first PRBS compression unit 113 may be configured to compress the multi-channel signals distributed by the power splitter 112 using the first PRBS.

The second PRBS compression unit 114 may be configured to compress the multi-channel signal compressed by the first PRBS compression unit 113 using the second PRBS.

The low-pass filter 115 may be configured to remove spurious signals from the multi-channel signal compressed by the second PRBS compressor 114.

The loss compensation amplifier 116 may be configured to amplify the multi-channel signal from which the unwanted signal has been removed in the low-pass filter 115 to compensate for the path / conversion loss.

The analog-to-digital converter 117 may be configured to convert the amplified multi-channel signal in the loss compensation amplifier 116 into a digital signal.

The digital signal receiving module 120 may be configured to double-compress the multi-channel signals received by the multi-channel signal receiving module 110 using PRBS having a different data rate, respectively, and restore the multi-channel signals again . Hereinafter, the detailed configuration will be described.

The digital signal receiving module 120 includes a data expanding unit 121, a spectrum slice detecting unit 122, a signal restoring unit 123, a parameter extracting unit 124, and an operator interface unit 125 Lt; / RTI >

Here, the data expansion unit 121 may be configured to expand the digital signal converted by the analog-to-digital converter 117.

The data extension unit 121 may be configured to expand the converted digital signal from the analog-to-digital converter 117 to reduce the number of physical channels to generate a virtual channel.

The data extension unit 121 generates a virtual channel in order to lower the correlation between channels in the compression sensing and improve the data restoration performance. The PRBSs inputted to the respective channels are different from each other, and the lower the correlation between the PRBSs, the more the channel characteristics are prominent.

When a blind signal K which does not know the position of a frequency is input in the compression sensing technique and an M bit (bit) PRBS signal is used, the number of channels m necessary for recovering the number m can be defined as Equation 1 .

For example, assuming that K is 2 and PRBS is 127 bits, the number of channels required is 12.01. A physical implementation of this requires about 13 channels. However, if the analog-to-digital converter 117 has a sufficiently large sampling frequency, it can expand information to create a virtual channel. Thereby, the number of required channels can be satisfied and the number of physical channels themselves can be reduced.

Table 1 below shows a case in which a virtual channel is created through expansion, and a case in which a virtual channel is not created.

If the sampling frequency is sufficiently high, it is possible to sample a wider bandwidth than the actual required bandwidth and expand the data to reduce the number of physical channels.

의 주파수 축에서 입력되는 신호가

개의 물리 채널로 입력될 때 이를 확장하면

개의 채널로 데이터를 처리할 수 있음을 나타낸다.Referring to FIG. 4 for a moment, this extension process is included. In the received signal

The signal input on the frequency axis of

When they are input into the physical channels, they are expanded

Indicates that the data can be processed by the number of channels.

The spectrum slice detection unit 122 may be configured to detect a threat signal through signal power detection of the digital signal extended in the data extension unit 121. [

More specifically, the spectrum slice detection unit 122 may be configured to divide the digital signal extended in the data extension unit 121 into spectral slice units and detect the signal power in units of spectral slices to determine presence or absence of a signal .

The upper spectral slice detection is a digital signal processing process that finds a section where a signal exists on the frequency axis. In the receiver, it is impossible to know which of the wide frequency ranges the signal is input. Therefore, the presence of the signal can be determined by dividing the input frequency range finely by the spectrum slice unit and detecting the power of the signal in each slice.

First, data sampled through the analog-to-digital converter 117 is processed on the frequency axis through FFT and expansion, and each frequency range can be divided into spectral slices and matrixized. Then, an absolute value may be taken for each matrix value, and it may be configured to determine a factor having the highest value, that is, the factor having the highest energy distribution.

행렬에서 빨간색과 파란색으로 표시한 부분이 신호가 존재하는 구간이며, 신호가 존재하지 않는 구간은 흰색으로 표시되어 있다. 스펙트럼 슬라이스 탐지 과정을 하지 않는다면 방정식보다 미지수가 많은 부정 방정식에 상응하는 언더-결정(under-determined) 시스템이 되거나

개의 모든 주파수에 대해 계산을 해야 하지만, 도 4와 같이 스펙트럼 슬라이스 탐지를 통해 빨간색과 파란색의 신호를 찾고, 이에 해당하는 행렬 계산만 한다면 방정식 보다 미지수보다 많은 오버-결정(over-determined) 시스템이 되어 행렬 계산이 수월해진다.4,

In the matrix, red and blue indicate the interval in which the signal is present, and white in the absence of the signal. Without the spectral slice detection process, an under-determined system corresponding to an unknown equation that is more unknown than an equation

However, if we calculate the red and blue signals by spectral slice detection as shown in FIG. 4, and calculate the corresponding matrix, it becomes an over-determined system than the unknown. Matrix calculation becomes easy.

The signal restoring unit 123 may be configured to restore the threat signal detected by the spectrum slice detecting unit 122 through a measurement matrix inverse operation. That is, it may be configured to combine a measurement matrix having a complex inverse matrix relation with a matrix for the PRBS signal into a signal to restore the original signal.

More specifically, the signal restoring unit 123 restores the upper dual-compressed multi-channel signal using a complex symmetric matrix for the multiplication of the first PRBS and the second PRBS as a measurement matrix Lt; / RTI >

라는 행렬이고 입력 신호 x라고 할 때 압축에 의해 신호 y가 얻어진다.PRBS < RTI ID = 0.0 >

And a signal y is obtained by compression when the input signal x is denoted.

의 복소 역행렬을 구하면 되며, 아래 수학식 3과 같이 신호 x가 구해질 수 있다.If you want to know the signal x

The signal x can be obtained as shown in the following Equation 3. < EMI ID = 3.0 >

The parameter extracting unit 124 may be configured to extract the parameter of the threat signal restored by the signal restoring unit 123. [

The parameter extracting unit 124 extracts a pulse width, a pulse arrival time, a pulse period, a frequency, a size, and a modulation characteristic of the threat signal restored by the signal restoring unit 123 to generate a PDW (pulse description word) .

The operator interface unit 125 may be configured to output the parameters extracted by the parameter extraction unit 124 and analyze the parameters by the operator.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention as defined in the following claims. There will be.

110: Multi-channel signal receiving module
111: Low noise amplifier
112: Power distributor
113: First PRBS compression section
114: second PRBS compression section
115: Low-pass filter
116: loss compensation amplifier section
117: Analog-to-digital converter
120: Digital signal receiving module
121:
122: spectrum slice detection unit
123:
124: Parameter extraction unit
125: Operator interface unit

Claims (15)

A multi-channel signal receiving module for receiving a wide-band multi-channel signal;
Channel signal received by the multi-channel signal receiving module by using a pseudo random binary sequence (PRBS) having a different data rate, and restoring the compressed multi-channel signal, / RTI >
The digital signal receiving module includes:
A low noise amplifier for low noise amplifying a wideband multi-channel signal received through an antenna;
A power divider for distributing low-noise amplified multi-channel signals in the low-noise amplifier;
A first PRBS compression unit for compressing the multi-channel signals distributed by the power divider by using a first PRBS (pseudo random binary sequence);
A second PRBS compression unit for compressing the multi-channel signal compressed by the first PRBS compression unit using a second PRBS;
A low-pass filter for removing an unnecessary signal from the multi-channel signal compressed by the second PRBS compression unit;
A loss compensation amplifier for amplifying the multi-channel signal from which the spurious signal is removed in the low-pass filter to compensate for path / conversion loss;
An analog-to-digital converter for converting the multi-channel signal amplified by the loss compensation amplifier into a digital signal;
A data expander for expanding the digital signal converted by the analog-to-digital converter;
A spectrum slice detection unit for detecting a threat signal through signal power detection of the digital signal extended in the data extension unit;
A signal restoring unit for restoring the threat signal detected by the spectrum slice detecting unit through a measurement matrix inverse calculation;
A parameter extracting unit for extracting a parameter of the threat signal restored by the signal restoring unit;
And an operator interface unit for outputting the parameter extracted by the parameter extracting unit,
Wherein the data expanding unit comprises:
And to expand the converted digital signal in the analog-to-digital converter to reduce the number of physical channels to generate a virtual channel,
Wherein the spectral slice detector comprises:
Wherein the data extension unit divides the digital signal extended in units of spectral slices and detects signal power in spectral slice units to determine presence / absence of a signal,
Wherein the signal restoring unit comprises:
The spectral slice detector may be configured to restore only the signal of the frequency determined to exist the signal so that the matrix calculation may be facilitated so that the equation is greater than the unknown value in the matrix calculation in the signal restoration,
Wherein the signal restoring unit comprises:
Channel signal using a complex symmetric matrix for multiplying the first PRBS and the second PRBS according to the following equation,
[Mathematical Expression]

Where x is the reconstructed signal, y is the doubly compressed multi-channel signal, A is PRBS,
Wherein the parameter extracting unit comprises:
And generating a pulse description word (PDW) by extracting a pulse width, a pulse arrival time, a pulse period, a frequency, a size, and a modulation characteristic of the threat signal restored by the signal restoring unit. Broadband digital receiver using sensing. delete delete delete delete delete delete delete delete delete delete delete delete delete delete

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