CN111030713A - Transient pulse interference resisting device and method - Google Patents
Transient pulse interference resisting device and method Download PDFInfo
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- CN111030713A CN111030713A CN201911043888.6A CN201911043888A CN111030713A CN 111030713 A CN111030713 A CN 111030713A CN 201911043888 A CN201911043888 A CN 201911043888A CN 111030713 A CN111030713 A CN 111030713A
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
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Abstract
The invention discloses an anti-transient pulse interference device and a method, wherein the device comprises: the analog device is used for receiving an analog signal transmitted by a signal source and processing the analog signal to obtain a processed analog signal; the nonlinear signal amplitude compression circuit is used for carrying out amplitude compression on the processed analog signal to obtain a compressed analog signal; the analog-digital converter is used for converting the compressed analog signal into a digital signal; the nonlinear signal amplitude expansion circuit is used for carrying out amplitude expansion on the digital signal and recovering the linear proportion of the digital signal. The invention improves the allowable dynamic range of the input signal of the analog-digital converter by adding a nonlinear signal amplitude compression circuit, thereby avoiding the problem of signal saturation distortion caused by transient interference pulse.
Description
Technical Field
The invention relates to the field of digital communication, in particular to an anti-transient pulse interference device and an anti-transient pulse interference method.
Background
Impulse interference is a common channel interference in a communication system, and when the impulse interference occurs, the quality of a received signal is seriously deteriorated, and the amplitude of the received signal even far exceeds the maximum processing voltage of a receiver, so that internal signals are saturated and completely distorted. When a pulse interference signal passes through an on-board coupling transformer, a passive analog filter and other analog devices, interference energy does not disappear rapidly due to the charging and discharging effects of an energy storage device or a parasitic inductance capacitor, the interference energy is weakened gradually after the external pulse interference disappears and continues to exist for a long time, and the pulse interference is called transient pulse interference. In practical communication systems, time delays of impulsive interference are always present.
Although the pulse interference amplitude of the time prolongation is not large and gradually attenuates, the energy of the pulse interference is still prone to cause signal saturation after the pulse interference amplitude is amplified by the amplifier, once the signal is saturated, the interference signal and the useful signal of the part cannot be further separated, and the interference action time of the original pulse signal is greatly widened.
Disclosure of Invention
Therefore, the technical problem to be solved by the present invention is to overcome the defect of signal saturation caused by widening the interference action time of the original pulse interference signal due to transient pulse interference in the prior art, thereby providing a device and a method for resisting transient pulse interference.
According to a first aspect, an embodiment of the present invention discloses an anti-glitch apparatus, including: the analog device is used for receiving an analog signal transmitted by a signal source and processing the analog signal to obtain a processed analog signal; the nonlinear signal amplitude compression circuit is used for carrying out amplitude compression on the processed analog signal to obtain a compressed analog signal; the analog-digital converter is used for converting the compressed analog signal into a digital signal; the nonlinear signal amplitude expansion circuit is used for carrying out amplitude expansion on the digital signal and recovering the linear proportion of the digital signal.
With reference to the first aspect, in a first implementation manner of the first aspect, the apparatus further includes: and the low-noise amplifier is respectively connected with the analog device and the nonlinear signal amplitude compression circuit and is used for amplifying the processed analog signal and transmitting the amplified analog signal to the nonlinear signal amplitude compression circuit.
With reference to the first embodiment of the first aspect, in a second embodiment of the first aspect, the apparatus further includes: and the programmable gain amplifier is respectively connected with the nonlinear signal amplitude compression circuit and the analog-digital converter and is used for adjusting the gain of the compressed analog signal and transmitting the adjusted analog signal to the analog-digital converter.
With reference to the first aspect, in a third implementation manner of the first aspect, the analog device is a coupling transformer or a passive analog filter.
According to a second aspect, an embodiment of the present invention discloses an anti-glitch method, including the following steps: acquiring an analog signal passing through an analog device; performing amplitude compression on the analog signal to obtain a compressed analog signal; converting the compressed analog signal into a digital signal through an analog-digital converter; and carrying out amplitude expansion on the digital signal to recover the linear proportion of the digital signal.
With reference to the second aspect, in the first embodiment of the second aspect, before the amplitude compressing the analog signal to obtain a compressed analog signal, the method further includes: and amplifying the analog signal through a low-noise amplifier, and transmitting the amplified analog signal to a nonlinear signal amplitude compression circuit.
With reference to the first embodiment of the second aspect, in the second embodiment of the second aspect, after performing amplitude compression on the analog signal to obtain a compressed analog signal, the method further includes: and adjusting the gain of the compressed analog signal through a programmable gain amplifier, and transmitting the adjusted analog signal to the analog-digital signal filter.
With reference to the second aspect, in a third implementation of the second aspect, the analog device is a coupling transformer or a passive analog filter.
According to a third aspect, an embodiment of the present invention discloses a receiver, which includes the apparatus for resisting glitch described in the first aspect or any implementation manner of the first aspect.
The technical scheme of the invention has the following advantages:
the invention provides an anti-transient pulse interference device, which comprises: the device comprises an analog device, a nonlinear signal amplitude compression circuit, an analog-digital converter and a nonlinear signal expansion circuit, wherein the analog device is used for receiving an analog signal transmitted by a signal source and processing the analog signal to obtain a processed analog signal; the nonlinear signal amplitude compression circuit is used for carrying out amplitude compression on the processed analog signal to obtain a compressed analog signal; an analog-to-digital converter for converting the compressed analog signal into a digital signal; the nonlinear signal amplitude expansion circuit is used for carrying out amplitude expansion on a digital signal and recovering the linear proportion of the digital signal, and the dynamic range allowed by an input signal of the analog-digital converter is improved by adding the nonlinear signal amplitude compression circuit, so that a large signal component and a useful small signal component of pulse interference are acquired to a digital domain without distortion as much as possible, the large signal component and the useful small signal component are further processed by a digital processor, and the problem of signal saturation distortion caused by transient interference pulses is avoided.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic block diagram of a specific example of a digital communication transceiving link of the present invention;
fig. 2 is a schematic block diagram of a specific example of the glitch suppression apparatus according to embodiment 1 of the present invention;
fig. 3 is a flowchart of a specific example of an anti-glitch method according to embodiment 2 of the present invention;
fig. 4 is a flowchart of a specific example of an anti-glitch method according to embodiment 2 of the present invention;
fig. 5 is a flowchart of a specific example of the glitch suppression method in embodiment 2 of the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; the two elements may be directly connected or indirectly connected through an intermediate medium, or may be communicated with each other inside the two elements, or may be wirelessly connected or wired connected. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Example 1
An anti-glitch apparatus according to an embodiment of the present invention is applied to a digital communication transceiving link, as shown in fig. 1, where the digital communication transceiving link includes a transmitter 01, a channel 02, and a receiver 03, where the receiver includes a received signal processing chip 032 and an analog filter 031, the received signal processing chip is mainly composed of an analog front end 320 and a digital baseband signal processor 321, where the analog front end 320 includes a low noise amplifier 11, a programmable gain amplifier 13, an analog-to-digital converter 14, and other circuits.
As shown in fig. 2, the anti-glitch apparatus includes: the device comprises an analog device 10, a nonlinear signal amplitude compression circuit 12, an analog-digital converter 14 and a nonlinear signal amplitude expansion circuit 15.
The analog device 10 is configured to receive an analog signal transmitted by a signal source, and process the analog signal to obtain a processed analog signal.
In the digital communication transceiving link, the analog device is an analog filter, the analog filter receives an analog signal transmitted by a channel of the digital communication transceiving link, and performs filtering processing on the analog signal to obtain a filtered analog signal, the analog signal transmitted from the channel causes a certain time delay to impulse interference after passing through the analog filter, and the impulse interference having the time delay is transient impulse interference.
And the nonlinear signal amplitude compression circuit 12 is used for performing amplitude compression on the processed analog signal to obtain a compressed analog signal.
Illustratively, the nonlinear signal amplitude compression circuit can be implemented by using a logarithmic amplifier, which can amplify the larger amplitude signal (mainly the time-delayed impulse interference) by a smaller factor, and amplify the smaller amplitude signal (mainly the useful analog signal) by a larger factor, which is equivalent to expanding the maximum amplitude of the input signal allowed by the analog-to-digital converter, such as an analog-to-digital converter which can process the input signal 0-1V, now can process the equivalent input signal range of 0-2V, and the actual signal voltage is still 0-1V.
An analog-to-digital converter 14 for converting the compressed analog signal into a digital signal.
And the nonlinear signal amplitude expansion circuit 15 is used for carrying out amplitude expansion on the digital signal and restoring the linear proportion of the digital signal.
For example, the nonlinear signal amplitude expansion circuit can be implemented in the digital domain by table lookup interpolation, which is a general digital technique for implementing any function mapping relationship and is not described herein.
The invention provides an anti-transient pulse interference device, which comprises: the device comprises an analog device, a nonlinear signal amplitude compression circuit, an analog-digital converter and a nonlinear signal expansion circuit, wherein the analog device is used for receiving an analog signal transmitted by a signal source and processing the analog signal to obtain a processed analog signal; the nonlinear signal amplitude compression circuit is used for carrying out amplitude compression on the processed analog signal to obtain a compressed analog signal; an analog-to-digital converter for converting the compressed analog signal into a digital signal; the nonlinear signal amplitude expansion circuit is used for carrying out amplitude expansion on a digital signal and recovering the linear proportion of the digital signal, and the dynamic range allowed by an input signal of the analog-digital converter is improved by adding the nonlinear signal amplitude compression circuit, so that a large signal component and a useful small signal component of pulse interference are acquired to a digital domain without distortion as much as possible, the large signal component and the useful small signal component are further processed by a digital processor, and the problem of signal saturation distortion caused by transient interference pulses is avoided.
As an alternative embodiment of the present application, as shown in fig. 2, the apparatus further includes:
and the low-noise amplifier 11 is connected with the analog device 10 and the nonlinear signal amplitude compression circuit 12, and is configured to amplify the analog signal and transmit the amplified analog signal to the nonlinear signal amplitude compression circuit 12.
Illustratively, the noise figure of the low noise amplifier 11 is very low, and in the case of amplifying a weak signal, the noise of the amplifier itself may cause serious interference to the signal, so that it is necessary to reduce the noise to improve the signal-to-noise ratio of the output.
As an alternative embodiment of the present application, as shown in fig. 2, the apparatus further includes:
and the programmable gain amplifier 13 is connected to the nonlinear signal amplitude compression circuit 12 and the analog-to-digital converter 14, and is configured to adjust the gain of the compressed analog signal and transmit the adjusted analog signal to the analog-to-digital converter 14.
The programmable gain amplifier 13 is a very versatile amplifier, and its amplification factor can be controlled according to the actual need and according to a certain rule, and by using this amplifier, the amplification factor of the processed signal can be adjusted as needed to meet the requirements of the subsequent circuits and systems.
Example 2
An embodiment of the present invention provides a method for resisting transient impulse interference, as shown in fig. 3, including:
in step S21, an analog signal passing through the analog device is acquired.
Illustratively, after passing through an analog device, a certain time delay is caused to the impulse interference, which is called transient impulse interference, although the amplitude of the impulse interference of the time delay is not large and gradually attenuates, but the energy of the impulse interference of the time delay still tends to cause signal saturation after being amplified by an amplifier.
And step S22, performing amplitude compression on the analog signal to obtain a compressed analog signal.
Illustratively, the analog signal is amplitude-compressed by a nonlinear signal amplitude compression circuit, which may be implemented by a logarithmic amplifier, and which amplifies the larger amplitude signal (mainly the time-delayed impulse interference) by a smaller factor and the smaller amplitude signal (mainly the useful analog signal) by a larger factor, equivalent to an analog-to-digital converter that expands the maximum amplitude of the input signal allowed by the analog-to-digital converter, such as an analog-to-digital converter that could handle input signals 0-1V, now can handle the equivalent 0-2V input signal range, while the actual signal voltage is still 0-1V.
In step S23, the compressed analog signal is converted into a digital signal by an analog-to-digital converter.
In step S24, the digital signal is amplitude-expanded to restore the linear scale of the digital signal.
Illustratively, the digital signal is amplitude-extended by using a nonlinear signal amplitude extension circuit, which can be implemented in the digital domain by table lookup interpolation, which is a general digital technique for implementing any function mapping relationship and is not described herein again.
The invention provides an anti-transient pulse interference method, which comprises the following steps: acquiring an analog signal passing through an analog device; performing amplitude compression on the analog signal to obtain a compressed analog signal; converting the compressed analog signal into a digital signal through an analog-digital converter; and carrying out amplitude expansion on the digital signal to recover the linear proportion of the digital signal. The amplitude compression is carried out on the analog signal through a nonlinear signal amplitude compression circuit, the allowable dynamic range of the input signal of the analog-digital converter is improved, and therefore the large signal component and the useful small signal component of the pulse interference are acquired to a digital domain without distortion as much as possible, the digital domain is used for further processing of a digital processor, and the problem of signal saturation distortion caused by transient interference pulses is avoided.
As an alternative embodiment of the present application, as shown in fig. 4, the method further includes:
step S201, amplifying the analog signal by the low noise amplifier, and transmitting the amplified analog signal to the nonlinear signal amplitude compression circuit.
Illustratively, the noise figure of the low noise amplifier is very low, and in the case of amplifying a weak signal, the noise of the amplifier itself may cause serious interference to the signal, so that it is necessary to reduce the noise to improve the signal-to-noise ratio of the output.
As an alternative embodiment of the present application, as shown in fig. 5, the method further includes:
step S202, adjusting the gain of the compressed analog signal by the programmable gain amplifier, and transmitting the adjusted analog signal to the analog-to-digital converter.
The programmable gain amplifier is a very versatile amplifier, and the amplification factor of the amplifier can be controlled according to actual needs and a certain rule.
As an optional implementation mode of the application, the method comprises the following steps:
the analog device may be a coupling transformer or a passive analog filter.
Example 3
An embodiment of the present invention provides a receiver, as shown in fig. 1, including the apparatus for resisting glitch in the foregoing embodiment, where the analog device is an analog filter.
The receiver provided by the invention comprises the transient pulse interference resisting device in the embodiment, the analog device is an analog filter, the analog filter receives an analog signal transmitted by a channel and carries out filtering processing, pulse interference passing through the analog filter has certain time delay, and the allowable dynamic range of an input signal of the analog-digital converter is improved through the nonlinear signal amplitude compression circuit, so that large signal components and useful small signal components of the pulse interference are acquired to a digital domain without distortion as much as possible, the digital domain is used for further processing by a digital processor, and the problem of signal saturation distortion caused by transient interference pulses is avoided.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (9)
1. An anti-glitch device, comprising: analog device, nonlinear signal amplitude compression circuit, analog-to-digital converter, nonlinear signal expansion circuit,
the analog device is used for receiving an analog signal transmitted by a signal source and processing the analog signal to obtain a processed analog signal;
the nonlinear signal amplitude compression circuit is used for carrying out amplitude compression on the processed analog signal to obtain a compressed analog signal;
the analog-digital converter is used for converting the compressed analog signal into a digital signal;
the nonlinear signal amplitude expansion circuit is used for carrying out amplitude expansion on the digital signal and recovering the linear proportion of the digital signal.
2. The anti-glitch apparatus of claim 1, further comprising:
and the low-noise amplifier is respectively connected with the analog device and the nonlinear signal amplitude compression circuit and is used for amplifying the processed analog signal and transmitting the amplified analog signal to the nonlinear signal amplitude compression circuit.
3. The anti-glitch apparatus of claim 2, further comprising:
and the programmable gain amplifier is respectively connected with the nonlinear signal amplitude compression circuit and the analog-digital converter and is used for adjusting the gain of the compressed analog signal and transmitting the adjusted analog signal to the analog-digital converter.
4. The anti-glitch apparatus of claim 1, in which the analog device is a coupling transformer or a passive analog filter.
5. An anti-glitch method, comprising the steps of:
acquiring an analog signal passing through an analog device;
performing amplitude compression on the analog signal to obtain a compressed analog signal;
converting the compressed analog signal into a digital signal through an analog-digital converter;
and carrying out amplitude expansion on the digital signal to recover the linear proportion of the digital signal.
6. The method of claim 5, wherein before the amplitude compressing the analog signal to obtain a compressed analog signal, the method further comprises:
and amplifying the analog signal through a low-noise amplifier, and transmitting the amplified analog signal to a nonlinear signal amplitude compression circuit.
7. The method of claim 6, further comprising, after the amplitude compressing the analog signal to obtain a compressed analog signal:
and adjusting the gain of the compressed analog signal through a programmable gain amplifier, and transmitting the adjusted analog signal to the analog-digital converter.
8. The method of claim 5, wherein the analog device is a coupling transformer or a passive analog filter.
9. A receiver comprising an anti-glitch apparatus of any of claims 1-4.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911043888.6A CN111030713A (en) | 2019-10-30 | 2019-10-30 | Transient pulse interference resisting device and method |
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| CN201911043888.6A CN111030713A (en) | 2019-10-30 | 2019-10-30 | Transient pulse interference resisting device and method |
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Application publication date: 20200417 |