KR102119486B1 - Method and device for removing spurious, and wideband receiving apparatus using the same - Google Patents

Abstract

The present invention relates to a method for removing undesired waves in a broadband signal receiving apparatus which includes the steps of: converting a local oscillation signal into a digital signal and diagnosing undesired waves; generating a correction signal using a phase of the diagnosed undesired wave; generating a synthesized signal by synthesizing the received signal input to an antenna with the local oscillation signal; and removing the undesired waves from the synthesized signal using the correction signal. By compressing and receiving a signal having a broadband frequency, undesired waves generated while receiving the signal can be removed.

Description

Undesired wave removal method, undesired wave canceller, and broadband signal receiving device having same{METHOD AND DEVICE FOR REMOVING SPURIOUS, AND WIDEBAND RECEIVING APPARATUS USING THE SAME}

The present invention relates to a method for removing undesired waves, an undesired wave eliminator, and a broadband signal receiving apparatus having the same, and more specifically, a method for removing undesired waves capable of removing undesired waves generated by compressing and receiving signals of broadband frequencies , Unwanted wave canceller, and a broadband signal receiving apparatus having the same.

In general, a superheterodyne wideband receiver receives a wideband signal and processes the signal by dividing it by frequency. However, the superheterodyne broadband receiver has a limitation in the reception bandwidth by Nyquist sampling theory, and the multi-channel filter bank for dividing and processing each frequency band increases the size and weight and consumes power. There are many problems.

Recently, a broadband receiver using compression sensing has been developed to solve this problem. The compression-sensing wideband receiver compresses each band signal into a baseband and receives it at a low sampling rate, and then restores the original broadband signal to obtain signal information.

However, in the process of compressing and processing a signal, unnecessary waves, which are unnecessary signals in addition to the original signal, may be generated. Accordingly, when restoring the original signal, unnecessary waves are included and thus may be restored differently from the original signal. Therefore, there is a problem that the reliability of the acquired signal information is deteriorated.

KR 10-1921095 B

The present invention provides a method for removing undesired waves, an undesired wave eliminator, and a wideband signal receiving apparatus having the same, which can remove undesired waves generated while compressing and receiving a signal having a broadband frequency.

The present invention provides a method for removing unwanted waves, which can improve the performance of restoring the original signal, a unnecessary wave canceller, and a broadband signal receiving apparatus having the same.

The present invention is a method of removing unwanted waves of a broadband signal receiving apparatus using compression sensing, the process of converting a local oscillation signal into a digital signal and diagnosing the unwanted waves; A process of generating a correction signal using the diagnosed unwanted wave phase; Generating a synthesized signal by synthesizing a received signal input to the antenna with a local oscillation signal; And removing unwanted waves from the synthesized signal using the correction signal.

The process of diagnosing the unwanted waves may include generating a local oscillation signal, converting it into a digital signal, and sampling it; Obtaining data by synchronizing the period of the local oscillation signal and the sampled digital signal; And a process of finding unwanted waves in the data.

The process of diagnosing the unwanted wave may further include a step of blocking the received signal input to the antenna before generating the local oscillation signal and converting the local oscillation signal into a digital signal.

The process of generating the correction signal includes generating a correction signal to have an inverse phase opposite to the phase of the unwanted wave.

The process of removing unwanted waves from the synthesized signal using the correction signal includes: converting the synthesized signal into a digital signal; And removing unwanted waves by synthesizing a correction signal with the synthesized signal converted to a digital signal.

The present invention is an unnecessary wave eliminator provided in a broadband signal receiving apparatus using compression sensing, a diagnostic unit capable of diagnosing unwanted waves from a local oscillation signal passing through a digital converter provided in the broadband signal receiving apparatus; A storage unit capable of storing the phase of the diagnosed unwanted wave; And a correction unit capable of generating a correction signal using the phase of the stored unwanted wave, and using the correction signal to correct the combined signal of the received signal and the local oscillation signal input to the antenna to remove the unwanted wave. do.

The diagnostic unit may include a synchronization module capable of synchronizing local oscillation signals before and after passing through the digital converter; And an analysis module capable of finding unwanted waves by analyzing the synchronized signals.

The synchronization module may control the period of the local oscillation signal to be generated under the condition of Equation (1) below, and the frequency of the signal sampled by the digital converter may be controlled to generate under the condition of Equation (2) below. .

Equation (1): f _p = f _temp / N (where N is the number of bits of the local oscillation signal, f _p is the period of the local oscillation signal, and f _temp satisfies f _temp / N <2*f _max Minimum value, f _max is the maximum frequency of the antenna received signal)

Equation (2): f _s = f _p * q (where f _s is the frequency of the signal sampled by the digital converter, q is the largest integer satisfying f _s > 2*BW _IF , and BW _IF is the digital converter The bandwidth of the signal passed)

The diagnosis unit further includes a blocking module capable of blocking transmission of the received signal input to the antenna to the digital converter.

The correction unit may include a calculation module capable of calculating a correction signal having an opposite phase using the phase of the unwanted wave stored in the storage unit; And a synthesis module capable of synthesizing the synthesis signal and the correction signal.

The present invention is an antenna; A local oscillator capable of generating a local oscillation signal; A synthesizer capable of synthesizing a received signal input to the antenna and the local oscillation signal to generate a synthesized signal; A digital converter capable of converting the signal passing through the synthesizer into a digital signal; And an unnecessary wave canceller installed to remove unwanted waves from the synthesized signal.

The local oscillation signal generated by the local oscillator includes a pseudo random binary sequence (PRBS) signal.

According to embodiments of the present invention, it is possible to remove unnecessary waves generated while processing a signal of a broadband frequency. Accordingly, it is possible to improve the performance of restoring the original signal. Therefore, it is possible to improve the accuracy of work using a signal of a broadband frequency.

1 is a view showing the structure of a broadband signal receiving apparatus according to an embodiment of the present invention.
2 is a flow chart showing a method for removing unwanted waves according to an embodiment of the present invention.
3 is a diagram showing that unwanted waves are generated in the synthesized signal.
4 is a diagram illustrating sampling of unwanted waves according to an embodiment of the present invention.
5 is a view showing removing unwanted waves according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in more detail with reference to the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in various different forms, and only these embodiments allow the disclosure of the present invention to be complete, and the scope of the invention to those skilled in the art is completely It is provided to inform you. To describe the invention in detail, the drawings may be exaggerated, and the same reference numerals in the drawings refer to the same elements.

1 is a view showing the structure of a broadband signal receiving apparatus according to an embodiment of the present invention. Hereinafter, a broadband signal receiving apparatus using compression sensing according to an embodiment of the present invention will be described.

A wideband signal receiving apparatus according to an embodiment of the present invention can compress a signal mixed within a wideband frequency ranging from hundreds of MHz to tens of GHz into a signal having a bandwidth of tens to hundreds of MHz and restore a compressed signal. Referring to FIG. 1, the broadband signal receiving apparatus 100 includes an antenna 110, a multi-channel signal receiver 120, a local oscillator 130, a synthesizer 140, a synthesized signal processor 150, and a digital converter 160. , A digital signal receiver 180, and a noise canceller 170.

The antenna 110 is disposed in an external environment. Accordingly, the antenna 110 may receive an external received signal. The antenna 110 may receive received signals mixed within a wideband frequency.

The multi-channel signal receiver 120 is connected to the antenna 110. The multi-channel signal receiver 120 may receive a wideband received signal received by the antenna 110. The multi-channel signal receiver 120 includes a low-noise amplification unit 121, a power distribution unit 122, and a low-band filter 123. The low-noise amplifying unit 121 may amplify the broadband received signal received by the antenna 110 with low-noise. The power distribution unit 122 distributes the low noise amplified received signal for each band. The low-band filter 123 may remove unnecessary signals from received signals distributed for each band.

The local oscillator 130 may generate a local oscillation signal. The local oscillation signal may be a Pseudo Random Binary Sequence (PRBS) signal. The local oscillator 130 includes a local oscillation signal generation unit 131, a local oscillation signal amplification unit 132, and a local oscillation signal filter 133. The local oscillation signal generator 131 may generate a PRBS signal. The local oscillation signal amplification unit 132 may amplify the PRBS signal. The local oscillation signal filter 133 may remove unnecessary signals from the amplified PRBS signal.

The synthesizer 140 is disposed between the antenna 110 and the local oscillator 130 (or between the multi-channel signal receiver 120 and the local oscillator 130). The synthesizer 140 synthesizes and synthesizes a received signal input to the antenna 110 (or a received signal distributed for each receive path in the multi-channel signal receiver 120) and a local oscillator signal generated by the local oscillator 130. It can generate a signal. That is, the received signal for each band is compressed in the baseband by the PRBS signal to generate a composite signal.

The synthesized signal processor 150 is disposed between the synthesizer 140 and the digital converter 160. The synthesized signal processor 150 serves to process the synthesized signal synthesized by the synthesizer 140. The synthesized signal processor 150 includes a synthesized signal filter 151 and a synthesized signal amplifier 152. The composite signal filter 151 may remove unnecessary signals from the composite signal. The synthesized signal amplifier 152 may amplify the synthesized signal.

The digital converter 160 is connected to the synthesizer 140. The digital converter 160 may convert a signal that has passed through the synthesizer 140 into a digital signal. Accordingly, the analog signal passing through the synthesizer 140 may be converted into a digital signal and transmitted to the digital signal receiver 180.

The digital signal receiver 180 is connected to the digital converter 160. The digital signal receiver 180 may restore the digital signal converted by the digital converter 160 to an original signal. Parameters such as pulse width, pulse arrival time, pulse period, frequency, magnitude, and modulation characteristics can be extracted from the restored original signal. Accordingly, the user can extract and analyze the parameters of the original signal.

The unwanted wave remover 170 is installed to remove unwanted waves from the synthesized signal. The noise canceller 170 may be disposed between the digital converter 160 and the digital signal receiver 180.

At this time, the PRBS signal generated by the local oscillator 130 may generate unnecessary signals other than the original signal while passing through nonlinear elements (such as the local oscillator signal amplifying unit 132 or the synthesizer 140). Since these unwanted waves are present in the reception band, it is difficult to remove them, making reconstruction of the original signal difficult. Therefore, the unwanted wave of the local oscillation signal may be diagnosed using the unwanted wave remover 170, and the unwanted wave may be removed from the synthesized signal. Accordingly, performance of restoring the original signal of the digital signal receiver 180 can be improved. The unnecessary wave eliminator 170 includes a diagnosis unit 171, a storage unit 172, and a correction unit 173.

The diagnostic unit 171 may be connected to the digital converter 160. The diagnosis unit 171 may diagnose unnecessary waves from the local oscillation signal that has passed through the digital converter 160. The diagnostic unit 171 includes a synchronization module 171a and an analysis module 171b.

The synchronization module 171a may synchronize local oscillation signals before and after passing through the digital converter 160. That is, the period between the PRBS signal before passing through the digital converter 160 and the signal sampled by the digital converter 160 while the PRBS signal passes through the digital converter 160 may be synchronized. Therefore, when sampling unnecessary waves of the PRBS signal, data of the same phase can be obtained.

The analysis module 171b is connected to the synchronization module 171a. The analysis module 171b may analyze the synchronized signals to find unwanted waves. That is, it is possible to find unwanted waves by comparing and analyzing signals before and after the PRBS signal passes through the digital converter 160. As the original signal of the PRBS signal passes through the nonlinear elements, unnecessary waves may be generated. Accordingly, when the original signal of the PRBS signal before passing through the digital converter 160 is compared with the PRBS signal passing through the digital converter 160, unnecessary waves can be found and sampled. Accordingly, the analysis module 171b may acquire unnecessary wave phase information.

Meanwhile, the diagnostic unit 171 may further include a blocking module (not shown). The blocking module may be disposed between the antenna 110 and the synthesizer 140. The blocking module may open and close the signal path between the antenna 110 and the synthesizer 140.

For example, when the blocking module opens a path between the antenna 110 and the synthesizer 140, a received signal received from the antenna 110 may be transmitted to the synthesizer 140. Conversely, when the blocking module blocks the path between the antenna 110 and the synthesizer 140, the received signal received from the antenna 110 may not be transmitted to the synthesizer 140, and the received signal is a digital converter 160. It can also block what is being delivered to. Accordingly, while performing a diagnosis operation for finding unwanted waves in the PRBS signal, it is possible to block the received signal from being synthesized with the PRBS signal or transmitted to the digital converter 160. Accordingly, it is possible to accurately diagnose unwanted waves from the PRBS signal.

The storage unit 172 may be connected to the analysis module 171b. The storage unit 172 may store the phase of the diagnosed unwanted wave. Accordingly, the phase of the unwanted wave can be confirmed at a desired time point.

The correction unit 173 is connected to the storage unit 172. The correction unit 173 may generate a correction signal using the stored phase of the unwanted wave, and may remove the unwanted wave by correcting the synthesized signal with the correction signal. The correction unit 173 includes a calculation module 173a and a synthesis module 173b.

The calculation module 173a may generate and calculate a correction signal. That is, the operation module 173a may generate a correction signal having a phase opposite to the unnecessary wave by using the phase of the unwanted wave stored in the storage unit 172.

The synthesis module 173b is connected to the operation module 173a. The synthesis module 173b may synthesize a synthesis signal and a correction signal passing through the digital converter 160. Accordingly, unnecessary waves generated by the PRBS signal may be removed from the synthesized signal.

In this way, unwanted waves generated while processing a signal of a broadband frequency can be removed. Therefore, it is possible to improve the performance of restoring the original signal. Accordingly, it is possible to improve the accuracy of work using a signal of a broadband frequency.

2 is a flow chart showing a method for removing unwanted waves according to an embodiment of the present invention, FIG. 3 is a diagram showing that unwanted waves are generated in a synthesized signal, and FIG. 4 is sampling unnecessary waves according to an embodiment of the present invention 5 is a view showing removing unwanted waves according to an embodiment of the present invention. Hereinafter, a method for removing unwanted waves according to an embodiment of the present invention will be described.

A method of removing unwanted waves according to an embodiment of the present invention is a method of removing unwanted waves of a broadband signal receiving apparatus. Referring to Figure 2, the method of removing unwanted waves includes: converting a local oscillation signal into a digital signal and diagnosing unwanted waves (S110), generating a correction signal using the diagnosed phase of unwanted waves (S120), and antenna It includes the step of generating a synthesized signal by synthesizing the received signal input to the local oscillation signal (S130), and removing the unwanted wave from the synthesized signal using the correction signal (S140).

At this time, the unnecessary wave removal method may be performed by the unnecessary wave removal apparatus 100 according to an embodiment of the present invention as shown in FIG. The local oscillation signal may be a Pseudo Random Binary Sequence (PRBS) signal. The PRBS signal may be generated by the local oscillator 130 and then pass through a nonlinear device (such as the local oscillator signal amplifying unit 132 or the synthesizer 140) to generate unnecessary signals other than the original signal. Therefore, when a synthesized signal is generated by synthesizing a received signal and a PRBS signal as shown in FIG. 3, unnecessary waves may be generated. Accordingly, after diagnosing the unwanted wave from the local oscillation signal, an operation of removing the unwanted wave by correcting the synthesized signal according to the diagnosis result may be performed.

First, before generating the local oscillation signal, it is possible to block the reception signal input to the antenna 110 from being transmitted to the synthesizer 140. Thus, while the local oscillation signal is diagnosed, only the local oscillation signal is transmitted to the digital converter 160 through the synthesizer 140, so that the unwanted wave of the local oscillation signal can be accurately diagnosed.

Then, a local oscillation signal may be generated and transmitted to the digital converter 160. The local oscillation signal is converted into a digital signal while passing through the digital converter 160, and is sampled, and the unwanted wave may be diagnosed using the sampled digital signal.

In order to diagnose unnecessary waves, the period of the local oscillation signal and the sampled digital signal before passing through the digital converter 160 may be synchronized. For example, if the number of bits of the local oscillation signal is N, the period of the local oscillation signal is generated under the condition of Equation (1) below, and the frequency of the signal sampled by the digital converter 160 is It can be produced under the condition of equation (2).

Equation (1): f _p = f _temp / N (where f _p is the period of the local oscillation signal, f _temp is the minimum value that satisfies f _temp / N <2*f _max , and f _max is the antenna received signal It is the maximum frequency.)

Equation (2): f _s = f _p * q (where f _s is the frequency of the signal sampled by the digital converter, q is the largest integer satisfying f _s > 2*BW _IF , and BW _IF is the digital converter It is the bandwidth of the signal that has passed.)

The periods of the local oscillation signal and the signal sampled by the digital converter 160 are synchronized with the same settings as in equations (1) and (2). Therefore, when sampling the unwanted wave of the local oscillation signal, data of the same phase can be obtained.

Then, an unwanted wave can be found in the acquired phase data. That is, the local oscillation signal before and after being converted into a digital signal can be compared, and unwanted waves can be found and sampled as shown in FIG. 4. An unwanted wave may be generated as the original signal of the local oscillation signal passes through the nonlinear elements. Accordingly, when the original signal of the local oscillation signal before passing through the digital converter 160 is compared with the local oscillation signal passing through the digital converter 160, it is possible to find and sample unwanted waves. Accordingly, data indicating the phase of the unwanted wave may be obtained using the sampled unnecessary waves.

When data representing the phase of the unwanted wave is created, the created data can be stored. Accordingly, before the received signal is transmitted, it is possible to check whether an unwanted wave is generated from the local oscillation signal and obtain phase data of the unwanted wave.

Then, a corrected signal may be generated using the diagnosed phase of the unwanted wave (or stored phase data of the unwanted wave). The correction signal may have an inverse phase opposite to that of the unwanted wave. That is, the correction signal may have a phase capable of removing the unwanted wave when synthesized with the unwanted wave.

When the correction signal is generated, the signal path between the antenna 110 and the synthesizer 140 of the broadband signal receiving apparatus 100 may be opened. Accordingly, the received signal received by the antenna 110 is compressed while passing through the multi-channel signal receiver 120, and synthesized with the local oscillation signal by the synthesizer 140. The local oscillation signal may be generated by the local oscillator 130 and then pass through nonlinear elements to generate unnecessary signals other than the original signal. Accordingly, unwanted waves may exist in the synthesized signal obtained by combining the received signal and the local oscillation signal.

The composite signal is processed through the composite signal processor 150. Thereafter, the synthesized signal is transmitted to the digital converter 160 to be converted into a digital signal, and a correction signal can be used to remove unwanted waves from the digitally converted composite signal. That is, the synthesis module 173b provided in the unnecessary wave eliminator 170 may synthesize a synthesis signal and a correction signal passing through the digital converter 160. Therefore, as shown in FIG. 5, only the undesired waves present in the synthesized signal can be removed by a correction signal having an undesired wave and an inverse phase. Accordingly, after the unwanted wave generated by the local oscillation signal is removed from the synthesized signal, it may be transmitted to the digital signal receiver 180.

Then, the digital signal receiver 180 may restore the digital signal converted by the digital converter 160 to the original signal. Parameters such as pulse width, pulse arrival time, pulse period, frequency, magnitude, and modulation characteristics can be extracted from the restored original signal. Accordingly, the user can extract and analyze the parameters of the original signal. Since the unwanted waves have been removed, the original signal can be more accurately restored. Therefore, it is possible to improve the accuracy and precision of work using a signal of a broadband frequency.

As described above, although specific embodiments have been described in the detailed description of the present invention, various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined not only by the claims described below, but also by the claims and equivalents.

100: broadband signal receiver 110: antenna
120: multi-channel signal receiver 130: local oscillator
140: synthesizer 150: synthesized signal processor
160: digital converter 170: unnecessary eliminator
171: diagnostic unit 172: storage unit
173: correction unit 180: digital signal receiver

Claims (12)

As a method of removing unwanted waves generated in a broadband signal receiving apparatus using compression sensing,
Converting local oscillation signals into digital signals and diagnosing unwanted waves;
A process of generating a correction signal using the diagnosed unwanted wave phase;
Generating a synthesized signal by synthesizing a received signal input to the antenna with a local oscillation signal; And
The process of removing unwanted waves from the synthesized signal using the correction signal; includes,
The process of diagnosing the unwanted waves,
The process of generating a local oscillation signal and converting it into a digital signal for sampling,
The process of acquiring data by synchronizing the period of the local oscillation signal and the sampled digital signal, and
A method for removing unwanted waves, comprising the step of finding unwanted waves in the data. delete The method according to claim 1,
The process of diagnosing the unwanted waves,
Before generating the local oscillation signal and converting it to a digital signal,
And removing a received signal input to the antenna. The method according to claim 1,
The process of generating the correction signal,
And generating a correction signal to have an inverse phase opposite to the phase of the unwanted wave. The method according to claim 4,
The process of removing unwanted waves from the synthesized signal using the correction signal,
Converting the composite signal into a digital signal; And
A process of removing unwanted waves by synthesizing a correction signal into a synthesized signal converted to a digital signal, and removing unwanted waves. As a noise canceller provided in a broadband signal receiving apparatus using compression sensing,
A diagnostic unit capable of diagnosing unwanted waves from a local oscillation signal passing through a digital converter provided in the broadband signal receiving apparatus;
A storage unit capable of storing the phase of the diagnosed unwanted wave; And
Includes a correction unit for generating a correction signal using the phase of the stored unwanted wave, and using the correction signal to correct the combined signal of the received signal and the local oscillation signal input to the antenna to remove the unwanted wave; ,
The diagnostic unit,
A synchronization module capable of synchronizing local oscillation signals before and after passing through the digital converter; and
An unwanted wave canceller including an analysis module that can analyze the synchronized signals to find unwanted waves. delete The method according to claim 6,
The synchronization module can control to generate the period of the local oscillation signal under the condition of Equation (1) below, and the frequency of the signal sampled by the digital converter can be controlled to generate under the condition of Equation (2) below. Unnecessary eliminator.
Equation (1): f _p = f _temp / N (where N is the number of bits of the local oscillation signal, f _p is the period of the local oscillation signal, and f _temp satisfies f _temp / N <2*f _max Minimum value, f _max is the maximum frequency of the antenna received signal)
Equation (2): f _s = f _p * q (where f _s is the frequency of the signal sampled by the digital converter, q is the largest integer satisfying f _s > 2*BW _IF , and BW _IF is the digital converter Bandwidth of the signal passed) The method according to claim 6,
The diagnostic unit,
And a blocking module capable of blocking transmission of the received signal input to the antenna to the digital converter. The method according to claim 6,
The correction unit,
A calculation module capable of calculating a correction signal having an opposite phase using the phase of the unwanted wave stored in the storage unit; And
And a synthesis module capable of synthesizing the synthesized signal and the corrected signal. antenna;
A local oscillator capable of generating a local oscillation signal;
A synthesizer capable of synthesizing a received signal input to the antenna and the local oscillation signal to generate a synthesized signal;
A digital converter capable of converting the signal passing through the synthesizer into a digital signal; And
Broadband signal receiving apparatus comprising a; any one of claim 6 and claim 8 to claim 10 to remove the unwanted wave from the synthesized signal. The method according to claim 11,
The local oscillator signal generated by the local oscillator is a wideband signal receiving apparatus including a pseudo random binary sequence (PRBS) signal.

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