KR102144333B1 - 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 spurious waves generated in a broadband signal reception apparatus. According to the present invention, the method comprises the processes of: separating a local oscillation signal into a first differential signal and a second differential signal which is an inverse phase of the first differential signal; synthesizing a reception signal input to an antenna with the first differential signal to generate a synthesized signal; generating a cancellation signal by using the second differential signal; and removing spurious waves from the synthesized signal by using the cancellation signal. Accordingly, it is possible to remove spurious waves generated by compressing and receiving a wideband frequency signal.

Description

BACKGROUND OF THE INVENTION [0002] A method for removing unwanted waves, an unwanted wave removing device, and a wideband signal receiving device having the same TECHNICAL FIELD [METHOD AND DEVICE FOR REMOVING SPURIOUS]

The present invention relates to a method for removing an unwanted wave, a method for removing an unwanted wave, and a broadband signal receiving apparatus having the same, comprising: a method for removing unwanted waves generated while compressing and receiving a signal of a broadband frequency, and a unwanted wave remover , And to a broadband signal receiving apparatus having the same.

In general, a broadband receiver of a superheterodyne method receives a broadband signal, divides the signal for each frequency, and processes it. However, the superheterodyne type wideband frequency receiver has a limitation in the reception bandwidth as suggested by the Nyquist sampling theory, and the size and weight increase and consume due to the multi-channel filter bank that divides and processes each frequency band. There is a problem with a lot of power.

Recently, in order to solve this problem, a wideband receiver using compression sensing has been developed. A wideband receiver using a compression sensing method compresses a signal for each band into a baseband, receives it at a low sampling rate, and restores the signal to an original wideband signal to obtain signal information.

However, in the process of compressing and receiving signals by nonlinear devices, a problem arises in that unnecessary signals, which are unnecessary signals, are generated in addition to the original signal. Accordingly, when restoring a compressed signal into a wideband signal, since an unwanted wave is included, it may be restored differently from the original signal. Therefore, there is a problem that the reliability of the signal information finally acquired is deteriorated.

KR 10-1921095 B

The present invention provides a method for removing unwanted waves generated while compressing and receiving a wideband frequency signal, an unwanted wave remover, and a wideband signal receiving apparatus having the same.

The present invention provides a method for removing an unwanted wave, a method for removing an unwanted wave, and a broadband signal receiving apparatus having the same, which can improve the reliability of an acquired signal by compressing and receiving a wideband frequency signal.

The present invention provides a method for removing unwanted waves generated in a wideband signal receiving apparatus using compression sensing, the method comprising: separating a local oscillation signal into a first differential signal and a second differential signal that is out of phase with the first differential signal; Synthesizing the received signal input to the antenna with the first differential signal to generate a synthesized signal; Generating a cancellation signal by using the second differential signal; And removing the unwanted wave from the synthesized signal by using the cancellation signal.

The process of generating the cancellation signal includes a process of passing the second differential signal through a synthesis module.

The process of removing the unwanted wave from the synthesized signal comprises synthesizing the synthesized signal and the cancellation signal to cancel the unwanted wave of the synthesized signal generated during the generation of the synthesized signal and the unwanted wave of the canceled signal generated during the generation of the cancellation signal. It includes;

And a process of correcting at least one of a gain and a phase of the unwanted wave of the cancellation signal before the process of removing the unwanted wave from the synthesized signal.

The process of correcting at least one of a gain and a phase of the unwanted wave of the cancellation signal may include: matching a gain of the unwanted wave of the cancellation signal with a gain of the unwanted wave of the synthesized signal; Adjusting the phase of the unwanted wave of the cancellation signal to the opposite of the phase of the unwanted wave of the synthesized signal; It includes at least any one of.

The present invention provides an unwanted wave canceller provided in a wideband signal receiving apparatus using compression sensing, comprising: a separation module for separating a local oscillation signal into a first differential signal and a second differential signal; A first synthesis module connected to the separation module and configured to generate a synthesized signal by synthesizing a received signal input to an antenna and the first differential signal; And a removal unit capable of generating a cancellation signal using the second differential signal and removing unwanted waves of the synthesized signal using the cancellation signal.

The separation module includes: a first coil to which the local oscillation signal is input; And a second coil electromagnetically coupled to the first coil and capable of outputting the first differential signal and the second differential signal that is in phase opposite to the first differential signal.

The removing unit may include a second synthesis module connected to the separation module and configured to generate the cancellation signal having an unwanted wave in an inverse phase with respect to the unwanted wave of the synthesized signal; And a mixing module connected to the first synthesis module and the second synthesis module, respectively, and combining the synthesis signal and the cancellation signal.

And a correction unit capable of correcting at least one of a gain and a phase of the unwanted wave of the cancellation signal.

The correction unit may include an attenuation module configured to adjust a gain of the cancellation signal to the unwanted wave equal to the gain of the synthesized signal; And a phase conversion module configured to adjust the phase of the cancellation signal with respect to the unwanted wave to be opposite to the phase of the synthesized signal with respect to the unwanted wave.

The present invention includes a receiving end including an antenna; A low-noise amplification stage for low-noise amplification of a received signal received through the antenna; A signal distribution stage for distributing the multi-channel signal amplified by the low noise amplifier; A signal synthesis stage including a local oscillator capable of generating a local oscillation signal and an unwanted wave remover according to any one of claims 6 to 10 installed to remove an unwanted wave from the synthesized signal; And a digital signal conversion stage capable of converting the analog signal passing through the spurious wave eliminator into a digital 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 unwanted waves generated while processing a signal of a wideband frequency. Accordingly, in restoring the received signal back to the original signal, the restoration performance may be improved. Therefore, it is possible to improve the accuracy of work using a signal of a broadband frequency.

In addition, since the unwanted wave is removed from the received signal and then restored to the original signal, the signal-to-noise ratio required for signal restoration can be reduced.

In addition, it is possible to improve the reliability of information in a signal finally obtained by converting the received signal.

1 is a diagram 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 the generation of unwanted waves in a synthesized signal.
Fig. 4 is a diagram showing by sampling the generation of unwanted waves in a synthesized signal.

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. The drawings may be exaggerated to describe the invention in detail, and the same reference numerals in the drawings refer to the same elements.

1 is a diagram 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.

The broadband signal receiving apparatus according to an embodiment of the present invention may compress a signal mixed in a broadband frequency ranging from several hundred MHz to several tens of GHz into a signal having a bandwidth of several tens to several hundred MHz, and restore the compressed signal.

Referring to FIG. 1, a broadband signal receiving apparatus 1000 includes a receiving end 1100, a low noise amplifying end 1200, a signal distribution end 1300, a local oscillator 1410, and a signal synthesis end having an unwanted wave remover 1420. It may include a 1400 and a digital signal conversion stage 1500.

The receiving end 1100 is disposed in an external environment and may receive an analog signal. The receiving end 1100 may include an antenna for receiving a signal. That is, the antenna of the receiving end 1100 may receive signals mixed within a broadband frequency. In the following, the signal received by the antenna of the receiving end 1100 is referred to as a receiving signal, and the received signal passes through the low-noise amplification stage 1200 and the signal distribution stage 1300, and the first synthesis module 1422 of the signal synthesis stage 1400 ) Can be sent.

The low-noise amplifier stage 1200 is connected to the reception terminal 1100 and may serve to amplify a weak reception signal input to an antenna of the reception terminal 1100. In addition, the low-noise amplification stage 1200 may improve a signal-to-noise ratio (SNR) of a received signal input to the receiving terminal 1100. Here, the signal-to-noise ratio is a value obtained by dividing the strength of the signal by the strength of the noise, and may be a numerical expression indicating an amount of a noise component accompanying the signal.

At this time, since the signal received through the antenna is a weak signal including external noise, signal amplification must be performed in a state where noise is minimized, and a clear signal can be received only by suppressing incidental noise generated during signal amplification. . Accordingly, the low-noise amplifier stage 1200 sufficiently secures a noise figure and reduces attenuation in a transmission line to reduce noise in a received signal received through an antenna.

Here, the low-noise amplifier stage 1200 may include a low-band filter 1210 and a low-noise amplifier 1220. The low-band filter 1210 may remove unnecessary signals from a received signal transmitted from an antenna. The low-noise amplifier 1220 may low-noise amplify a wideband signal from a received signal transmitted from the low-band filter 1210.

The signal distribution terminal 1300 is connected to the low-noise amplifier stage 1200 and may distribute the low-noise amplified reception signal for each band. That is, the signal distribution terminal 1300 may create a plurality of communication paths having different frequency bands from each other, and distribute the received signal for each band to the signal synthesis terminal 1400 connected to each communication path. Here, the signal distribution terminal 1300 may be provided with a plurality of power dividers 1310.

The signal synthesizing stage 1400 is provided in plural, and the signal distribution stage 1300 compresses the received signal distributed for each band to down-convert the frequency to the baseband. The signal synthesis stage 1400 may include a local oscillator 1410, an unwanted wave canceller 1420, and a lowpass amplifier 1430.

The local oscillator 1410 may generate and amplify a local oscillation signal. Here, the local oscillation signal is a signal having a lower frequency than the received signal received by the antenna of the receiving end 1100, and passed through the signal distribution end 1300 in the first synthesis module 1422 of the spurious wave remover 1420 to be described later. It is synthesized with the received signal and can compress the received signal to baseband. For example, the local oscillation signal may be a Pseudo Random Binary Sequence (PRBS) signal. More specifically, when a PRBS signal is used, data may be spread and modulated using a direct sequence spread spectrum, and the modulated signal may be transmitted or received. Accordingly, when a signal is spread or modulated, security may be increased, and when a signal is restored, noise may be spread and thus less affected by a communication channel.

The local oscillator 1410 may include a local oscillation signal generation module 1411, a local oscillation signal amplification module 1412, and a local oscillation signal filter 1413. The local oscillation signal generation module 1411 may generate a local oscillation signal. The local oscillation signal amplification module 1412 is connected to the local oscillation signal generation module 1411 and may amplify the local oscillation signal. The local oscillation signal filter 1413 is connected to the local oscillation signal amplification module 1412 and may remove noise from the amplified local oscillation signal.

The unwanted wave remover 1420 is connected to the signal distribution terminal 1300 and the local oscillator 1410, respectively, and may generate a synthesized signal by synthesizing the received signal and the local oscillation signal distributed by the signal distribution terminal 1300, It is possible to remove unwanted waves generated when generating a composite signal. More specifically, the local oscillation signal is synthesized with other signals in the first synthesis module 1422 or the second synthesis module 1423a, which will be described later, or is compressed into the synthesized signal or baseband while passing through the synthesis module. Unnecessary signals may occur in addition to the generated signals. Here, in addition to the synthesized signal or a signal compressed into a baseband, unnecessary signals may be unnecessary. Since these unwanted waves exist in the reception band, it is difficult to remove them, and by increasing the signal-to-noise ratio in the signal, the received signal is converted into an original signal (i.e., a signal in a state before being transmitted to the antenna) at the digital signal conversion stage 1500 to be described later. When it comes to restoration, it can make restoration difficult. Accordingly, by removing the unwanted wave of the synthesized signal in the unnecessary wave remover 1420, the signal restoration performance in the digital signal conversion stage 1500 may be improved. The unwanted wave remover 1420 may include a separation module 1421, a first synthesis module 1422 and a removal unit 1423.

The separation module 1421 is connected to the local oscillator 1410 and can separate the local oscillation signal into a first differential signal and a second differential signal. That is, the separation module 1421 may be capable of outputting an input signal in a differential mode (Differential Signal) method. Here, the differential mode may mean dividing one frequency (or signal) into two frequencies (or signals) having the same amplitude and opposite phases. For example, the separation module 1421 may be provided with a balun or a transformer. The separation module 1421 may include a first coil 1421a and a second coil 1421b.

One side of the first coil 1421a is connected to the ground (ground), the other side is connected to the local oscillation signal filter 1413, and the separation module 1421 may serve to receive a local transmission signal. Here, one side may be a left side based on the first coil 1421a in the drawing, and the other side may be a right side based on the first coil 1421a in the drawing. For example, the first coil 1421a may be provided in a single-ended signal in which one conductor serving as a ground and one conductor through which a signal is transmitted are connected.

One side of the second coil 1421b may be connected to the first synthesis module 1422, and the other side may be connected to the second synthesis module 1423a of the removal unit 1423 to be described later. The second coil 1421b is disposed to face the first coil 1421a and may be electromagnetically coupled. The second coil 1421b may separate the local oscillation signal into a first differential signal and a second differential signal. That is, the second coil 1421b may separate the local oscillation signal into a first differential signal and a second differential signal having the same gain and a phase difference of 180°. Accordingly, the first differential signal may have an inverse phase with the same gain size as the second differential signal. The second coil 1421b may transmit a first differential signal to the first synthesis module 1422, and may transmit a second differential signal to the second synthesis module 1423a of the removal unit 1423.

The first synthesis module 1422 is connected to the signal distribution terminal 1300 and the second coil 1421b, and a received signal transmitted from the signal distribution terminal 1300 and a first differential signal transmitted from the second coil 1421b By synthesizing, a synthesized signal can be generated. That is, the received signal transmitted from the signal distribution terminal 1300 is synthesized with the first differential signal, and a synthesized signal compressed into a baseband may be generated. As described above, an unwanted wave may be generated while synthesizing the first differential signal and the received signal received through the antenna in the first synthesis module 1422 and passed through the low noise amplifier stage 1200 and the power distribution terminal 1300. That is, during the process of synthesizing the synthesized signal, unwanted waves of the synthesized signal may occur.

Meanwhile, a received signal amplifying module 1422a may be provided between the first synthesis module 1422 and the power divider 1310. The received signal amplifying module 1422a may amplify a received signal that has passed through the power distribution terminal 1300 received by the first synthesis module 1422.

The removal unit 1423 may generate a removal signal and use the removal signal to remove unwanted waves of the synthesized signal. That is, it is possible to remove unwanted waves from the synthesized signal. The removal unit 1423 may include a second synthesis module 1423a and a mixing module 1423b.

The second synthesis module 1423a is connected to the second coil 1421b and the ground resistor, and may generate a cancellation signal having an unwanted wave in an inverse phase with respect to the unwanted wave of the synthesized signal. More specifically, a second differential signal transmitted from the second coil 1421b may be received and passed through the second synthesis module 1423a to generate a cancellation signal at the output terminal of the second synthesis module 1423a. In this case, an unnecessary wave may be generated during the process of generating the cancellation signal in the second synthesis module 1423a using the second differential signal. At this time, since the generated unwanted wave is generated by synthesizing the first differential signal used to generate the synthesized signal and the second differential signal that is out of phase, the unwanted wave of the synthesized signal and the unwanted wave having a phase of 180° to each other may be generated. have. That is, an unnecessary wave of the synthesized signal and an unwanted wave of the cancellation signal that are out of phase may be generated.

The mixing module 1423b is connected to the first synthesis module 1422 and the second synthesis module 1423a, respectively, and may synthesize a synthesized signal and a cancellation signal. In this case, in the process of synthesizing the synthesized signal and the cancellation signal, an unnecessary wave of the synthesized signal may be removed.

In general, interference may occur when two or more wavelengths are synthesized. Here, the interference includes constructive and destructive interference. Constructive interference is an interference that occurs when two waves of the same phase are superimposed, and the amplitude is doubled when a ridge and a ridge or a ridge and a valley meet. On the other hand, destructive interference is an interference that occurs when two waves of opposite phases are superimposed. It is also called extinction interference as the interference that the amplitude becomes zero when the floor and the valley meet. That is, when the phases of the two waves are 180° out of each other, the wave can be completely canceled at the moment when the floor and the valley overlap.

According to this principle, destructive interference may occur with each other by synthesizing an unwanted wave of a synthesized signal, an unwanted wave of the synthesized signal, and an unwanted wave of a cancellation signal that is out of phase. Accordingly, the unwanted wave of the synthesized signal and the unwanted wave of the cancellation signal may cancel each other. Meanwhile, in the mixing module 1423b, the cancellation signal may be eliminated during a process in which the unwanted wave of the synthesized signal and the unwanted wave of the cancellation signal are destructively interfered. Accordingly, the mixing module 1423b removes the unwanted wave of the synthesized signal and eliminates the cancellation signal, so that only the synthesized signal from which the unwanted wave is removed may be transmitted to the digital signal conversion terminal 1500 connected to the mixing module 1423b.

Meanwhile, the unwanted wave remover 1420 may further include a correction unit 1424 capable of correcting at least one of a gain and a phase of the unwanted wave of the cancellation signal. In separating the local oscillation signal into the first differential signal and the second differential signal in the separation module 1421, the gains of the first differential signal and the second differential signal cannot be separated by the same size, or the first differential signal and It may not be possible to separate the phase of the second differential signal by exactly 180°. In addition, in moving the signal, the signal may change in gain or phase while generally passing through a transmission line connecting the module and the module.

If the separation module 1421 fails to equally separate the gains of the first differential signal and the second differential signal, or does not separate the phases oppositely, or if the gain or phase of the signal is different while passing through the transmission line , The mixing module 1423b may not be able to remove the unwanted waves of the synthesized signal.

Accordingly, through the correction unit 1424, the gain of the unwanted wave of the cancellation signal is corrected to the same magnitude as the gain of the unwanted wave of the synthesized signal, and the phase of the unwanted wave of the cancellation signal is adjusted to the phase of the unwanted wave of the synthesized signal. It can be corrected so that there is a difference of 180°. To this end, the correction unit 1424 is disposed between the mixing module 1423b and the second synthesis module 1423a, and may include an attenuation module 1424a and a phase change module 1424b.

The attenuation module 1424a is connected to the second synthesis module 1423a, and may adjust a gain for the unwanted wave of the cancellation signal to the same size as the gain for the unwanted wave of the synthesized signal.

The phase conversion module 1424b is connected to the attenuation module 1424a, and can adjust the phase of the unwanted wave of the cancellation signal to be opposite to the phase of the unwanted wave of the synthesized signal.

The lowpass amplifier 1430 may be disposed between the unwanted wave canceller 1420 and the digital signal conversion stage 1500. The low pass amplifier 1430 may include a low pass filter 1431 and a low pass amplification module 1432. The low-pass filter 1431 may pass only signals below a specific frequency. Accordingly, before the synthesized signal is transmitted to the digital signal converting stage 1500, only a synthesized signal of a specific frequency or lower, that is, a baseband, may be transmitted to the digital signal converting stage 1500.

The low-pass amplifier 1430 may amplify the synthesized signal transmitted from the low-pass filter 1431 before transmitting it to the digital signal conversion stage 1500.

The digital signal conversion stage 1500 may convert a synthesized signal from which the unwanted wave passing through the signal synthesis stage 1400 is removed into a digital signal. Accordingly, the analog signal passing through the signal synthesis stage 1400 may be converted into a digital signal and transmitted to a digital signal receiver (not shown).

In this way, it is possible to remove unwanted waves generated while processing a wideband frequency signal. Therefore, it is possible to improve the performance of restoring the received signal received at the receiving end to the original signal. Thus, it is possible to improve the accuracy in work using a wideband frequency signal.

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 generation of unwanted waves in a synthesized signal, and FIG. 4 is a sampling of generation of unwanted waves in a synthesized signal. It is a drawing showing. Hereinafter, a method for removing unwanted waves according to an embodiment of the present invention will be described with reference to FIGS. 2 to 4.

A method of removing unwanted waves according to an embodiment of the present invention is a method of removing unwanted waves from a broadband signal receiving apparatus. Referring to FIG. 2, the method of removing unwanted waves is a process of separating a local oscillation signal into a first differential signal, a first differential signal, and a second differential signal that is out of phase (S110), and a first differential signal input to the antenna A process of generating a synthesized signal by synthesizing it with a signal (S120), a process of generating a cancellation signal using a second differential signal (S130), and a process of removing an unwanted wave from the synthesized signal using the cancellation signal (S140). can do.

In this case, the method of removing unwanted waves may be performed, for example, by the broadband signal receiving apparatus 1000 according to the embodiment of the present invention shown in FIG. 1. In addition, the local oscillation signal to be described later may be a pseudo random binary sequence (PRBS) signal. After the PRBS signal is generated by the local oscillator 1410, the signal may be synthesized by nonlinear devices, such as the first synthesis module 1422 or the second synthesis module 1423a, or may pass through the nonlinear devices. In addition to signals synthesized or generated in the process of being synthesized or passed by the nonlinear devices, unnecessary signals, that is, unwanted waves may be generated. For example, as shown in FIGS. 3 and 4, when a received signal and a local oscillation signal are synthesized to generate a synthesized signal, an unnecessary wave may be generated. Accordingly, a task of removing an unwanted wave generated by synthesizing the local oscillation signal may be performed.

First, before generating the local oscillation signal, the received signal input to the antenna of the receiving end 1100 is passed through the low-noise amplifying end 1200 to amplify the weak received signal, and the signal to noise ratio (SNR) of the received signal is rate) can be improved. Subsequently, the received signal that has passed through the low-noise amplifier stage 1200 may be distributed for each band through the signal distribution stage 1300. Then, the local oscillator 1410 may generate a local oscillation signal.

The generated local oscillation signal may be transmitted to the separation module 1421, and the separation module 1421 may separate the local oscillation signal into a first differential signal and a second differential signal. That is, the local oscillation signal can be separated into a first differential signal and a second differential signal having the same gain and opposite phases (a phase difference of 180°).

By transmitting the first differential signal from the separation module 1421 to the first synthesis module 1422, the received signal and the first differential signal passed through the signal distribution terminal 1300 from the first synthesis module 1422 may be synthesized. have. Accordingly, a synthesized signal is generated, and an unnecessary wave of the synthesized signal may be generated during the process of generating the synthesized signal.

Meanwhile, the separation module 1421 may transmit the first differential signal to the first synthesis module 1422 and simultaneously transmit the second differential signal to the second synthesis module 1423a. In the second synthesis module 1423a, a second differential signal may be passed inside and a cancellation signal may be generated at an end portion. In this case, during the process of generating the cancellation signal, an unnecessary wave of the cancellation signal may be generated. Here, the spurious wave of the cancellation signal may have the same magnitude as the spurious wave of the synthesized signal, and may have an opposite phase, that is, an anti-phase.

Meanwhile, in separating the first differential signal and the second differential signal in the separation module 1421, the gain of the first differential signal and the gain of the second differential signal may not be separated by the same size, and The phase and the phase of the second differential signal may not be separated in opposite directions. Also, as the transmission signal passes through the transmission line, the gain and the phase may be changed. Accordingly, after generating the cancellation signal in the second synthesis module 1423a, the cancellation signal is passed through the attenuation module 1424a and the phase change module 1424b to correct the gain of the cancellation signal to the same size as the gain of the synthesis signal. And, it is possible to correct the phase of the cancellation signal to the opposite of the phase of the synthesis signal.

Thereafter, the synthesized signal and the canceled signal may be transmitted to the mixing module 1423b, so that the synthesized signal and the canceled signal may be synthesized by the mixing module 1423b. In this case, the unwanted wave of the synthesized signal and the unwanted wave of the cancellation signal interfere with each other and may be canceled out. That is, the unwanted wave of the synthesized signal, the unwanted wave of the synthesized signal, and the unwanted wave of the cancellation signal having the same gain and opposite phase can be combined to cause destructive interference. Accordingly, unwanted waves of the synthesized signal may be removed from the synthesized signal. Meanwhile, the cancellation signal may be destroyed during a process in which the unwanted wave of the synthesis signal and the unwanted wave of the cancellation signal are destructively interfered.

Thereafter, the synthesized signal from which the unnecessary waves have been removed may be transferred to the digital signal conversion stage 1500. The synthesized signal is converted into a digital signal while passing through the digital signal conversion stage 1500, and the converted digital signal may be restored to an original signal.

In this way, it is possible to remove unwanted waves generated while processing a wideband frequency signal. Therefore, it is possible to improve the performance of restoring the original signal. Thus, it is possible to improve the accuracy in work using a wideband frequency signal. Accordingly, parameters of the original signal can be extracted and analyzed. Since the unwanted waves have been removed, the original signal can be restored more accurately. Therefore, it is possible to improve the accuracy and precision of work using a signal of a broadband frequency.

As described above, in the detailed description of the present invention, specific embodiments have been described, but various modifications may be made 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.

1000: broadband signal receiving device 1100: receiving end
1200: low noise amplification stage 1300: signal distribution stage
1400: signal synthesis stage 1410: local oscillator
1420: unwanted wave remover 1500: digital signal conversion stage

Claims (12)

As a method of removing unwanted waves generated in a broadband signal receiver using compression sensing,
Separating the local oscillation signal into a first differential signal and a second differential signal that is out of phase with the first differential signal;
Synthesizing the received signal input to the antenna with the first differential signal through a first synthesis module to generate a synthesized signal;
Passing the second differential signal through a second synthesis module operating nonlinearly to generate a cancellation signal having an undesired wave in phase opposite to that of the synthesized signal; And
And removing the unwanted wave from the synthesized signal by using the cancellation signal. delete The method according to claim 1,
The process of removing the spurious wave from the synthesized signal,
And a step of synthesizing the synthesized signal and the cancellation signal to cancel an unwanted wave of the synthesized signal generated during generation of the synthesized signal and an unwanted wave of the cancellation signal generated during generation of the cancellation signal. The method of claim 3,
Before the process of removing unwanted waves from the synthesized signal,
And correcting at least one of a gain and a phase of the unwanted wave of the cancellation signal. The method of claim 4,
The process of correcting at least one of a gain and a phase of the unwanted wave of the cancellation signal,
Matching the gain of the unwanted wave of the cancellation signal with the gain of the unwanted wave of the synthesized signal;
Adjusting the phase of the unwanted wave of the cancellation signal to the opposite of the phase of the unwanted wave of the synthesized signal; A method for removing unwanted waves comprising at least any one of. As an unwanted wave canceller provided in a broadband signal receiver using compression sensing,
A separation module for separating the local oscillation signal into a first differential signal and a second differential signal that is out of phase with the first differential signal;
A first synthesis module connected to the separation module and configured to generate a synthesized signal by synthesizing a received signal input to an antenna and the first differential signal; And
And a second synthesis module connected to the separation module to generate a cancellation signal having a non-linear operation and a cancellation signal having an unwanted wave in a phase opposite to that of the synthesized signal as the second differential signal, and using the cancellation signal, And a removing unit capable of removing the unwanted wave of the synthesized signal. The method of claim 6,
The separation module,
A first coil to which the local oscillation signal is input; And
And a second coil electromagnetically coupled to the first coil and capable of outputting the first differential signal and the second differential signal. The method of claim 6,
The removal unit,
And a mixing module connected to the first synthesis module and the second synthesis module, respectively, and combining the synthesis signal and the cancellation signal. The method of claim 6,
A correction unit capable of correcting at least one of a gain and a phase of the unwanted wave of the cancellation signal. The method of claim 9,
The correction unit,
An attenuation module capable of adjusting the gain of the unwanted wave of the cancellation signal to be the same as the gain of the unwanted wave of the synthesized signal; And
And a phase conversion module configured to adjust the phase of the cancellation signal with respect to the unwanted wave to be opposite to the phase of the synthesized signal. A receiving end including an antenna;
A low-noise amplification stage for low-noise amplification of a received signal received through the antenna;
A signal distribution stage for distributing the multi-channel signal amplified by the low noise amplifier stage;
A signal synthesis stage including a local oscillator capable of generating a local oscillation signal and an unwanted wave remover according to any one of claims 6 to 10 installed to remove an unwanted wave from the synthesized signal; And
Broadband signal receiving apparatus comprising; a digital signal conversion stage capable of converting the analog signal passing through the spurious wave remover into a digital signal. The method of claim 11,
The local oscillation signal generated by the local oscillator includes a pseudo random binary sequence (PRBS) signal.

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