CN114900409B - A 2ASK signal demodulation method, device and readable storage medium - Google Patents

Abstract

The present application provides a 2ASK signal demodulation method, device and readable storage medium. The demodulation method is applied to a communication system, and includes: obtaining a 2ASK signal; converting the 2ASK signal into two DC signals according to the maximum amplitude phase point and the minimum amplitude phase point in a single cycle of the 2ASK signal; filtering the two DC signals respectively , to obtain two target signals; the two target signals are spliced to obtain a modulated signal; wherein, the 2ASK signal is obtained by modulating the modulated signal into a carrier signal through binary amplitude keying. In the process of demodulating the 2ASK signal, this application does not involve the links of orthogonal decomposition, square and square root in the existing demodulation method, so that the demodulation overhead can be effectively reduced, and the solution can be greatly improved. tuning efficiency.

Description

A 2ASK signal demodulation method, device and readable storage medium

【Technical field】

The present application relates to the technical field of signal processing, and in particular to a demodulation method, device and readable storage medium of a 2ASK signal.

【Background technique】

In a wireless charging system based on the Qi standard (a wireless charging standard), the transmission of modulation signals from the energy receiving end to the energy sending end is realized by means of 2ASK (binary amplitude keying), that is, the energy receiving end will transmit the modulated signal to the energy sending end. 2ASK signal is transmitted; wherein, the modulated signal is an unmodulated/original signal that needs to be modulated. The formation process of the 2ASK signal is as follows: the energy transmitting end provides the carrier signal to the energy receiving end; the energy receiving end modulates the modulation signal into the carrier signal by means of 2ASK, thus forming a modulated signal (that is, a 2ASK signal); thus, The carrier frequency (that is, the frequency of the carrier signal) is provided by the energy transmitter, and its range is usually 80-205KHz, which is not fixed. In practical applications, on the one hand, the carrier signal provided by the energy transmitting end is not a sine wave, but has a large number of high-order harmonics; on the other hand, due to problems such as coil coupling between the energy transmitting end and the energy receiving end, the As a result, the envelope of the 2ASK signal will be deformed in both positive and negative half axes.

In the related art, demodulation methods for modulated signals can generally be classified into two types, which are traditional demodulation methods and new demodulation methods. Among them, the traditional demodulation method will perform quadrature decomposition on the modulated signal to obtain the co-directional component and the quadrature component, and take the square root of the square sum of the co-directional component and the quadrature component respectively, and then remove the DC component; for this As far as this demodulation method is concerned, it cannot demodulate the modulated signal whose envelope has been damaged to a certain extent (for example, the envelope of the modulated signal is deformed in both positive and negative half axes, and/or the The envelopes are inconsistent on the positive and negative half axes, and/or the amplitude of the envelope of the modulated signal on the positive and negative half axes is very small), and operations such as square sum and opening are required, which will lead to a large demodulation overhead, less efficient. Although the new demodulation method optimizes the square and square root operations in the traditional demodulation method, there are still a series of other operations related to orthogonal decomposition, which will also lead to high demodulation overhead and low efficiency, and this This demodulation method also has higher requirements on the signal sampling frequency. It can be seen that no matter it is a traditional demodulation method or a new demodulation method, the demodulation overhead is large and the efficiency is low.

Therefore, it is necessary to improve the demodulation method of the above-mentioned modulated signal.

【Content of invention】

The present application provides a 2ASK signal demodulation method, device and readable storage medium, aiming to solve the problems of relatively large overhead and low efficiency when demodulating a modulated signal in the related art.

In order to solve the above technical problems, the first aspect of the embodiment of the present application provides a 2ASK signal demodulation method, which is applied to a communication system, and includes:

Obtaining a 2ASK signal; wherein, the 2ASK signal is obtained by modulating a modulating signal into a carrier signal through binary amplitude keying;

Converting the 2ASK signal into two DC signals according to the maximum amplitude phase point and the minimum amplitude phase point within a single cycle of the 2ASK signal;

Filtering the two direct current signals respectively to obtain two target signals;

performing signal splicing processing on the two channels of target signals to obtain the modulated signal.

The second aspect of the embodiment of the present application provides an electronic device, including a storage device and at least one processor; the storage device is used to store at least one program, and when the at least one program is executed by the at least one processor , so that the at least one processor executes the method for demodulating a 2ASK signal as described in the first aspect of the embodiments of the present application.

The third aspect of the embodiment of the present application provides a computer-readable storage medium, the computer-readable storage medium stores executable instructions, and when the executable instructions are executed, the execution is as described in the first aspect of the embodiment of the present application. The demodulation method of 2ASK signal.

As can be seen from the above description, compared with related technologies, the beneficial effects of the present application are:

First obtain the 2ASK signal; then convert the 2ASK signal into two DC signals according to the maximum amplitude phase point and the minimum amplitude phase point in a single cycle of the 2ASK signal; then filter the two DC signals respectively to obtain two target signals; finally Perform signal splicing processing on the two target signals to obtain the modulated signal; among them, the 2ASK signal is obtained by modulating the modulated signal into the carrier signal through binary amplitude keying. It can be seen that, in the process of demodulating the 2ASK signal, the present application does not involve links such as orthogonal decomposition and square sum square root in the existing demodulation method, thereby effectively reducing the demodulation overhead, and then being able to Greatly improve the efficiency of demodulation.

【Description of drawings】

In order to more clearly illustrate the related technologies or the technical solutions in the embodiments of the present application, the following will briefly introduce the accompanying drawings that need to be used in the description of the related technologies or the embodiments of the present application. Obviously, the accompanying drawings in the following description These are only some embodiments of the present application, rather than all embodiments. For those skilled in the art, other drawings can also be obtained according to these drawings without creative work.

Fig. 1 is a module block diagram of an energy transmitting end provided by an embodiment of the present application;

FIG. 2 is a preset schematic diagram of a phase point within a single cycle of a PWM signal provided by an embodiment of the present application;

FIG. 3 is another preset schematic diagram of a phase point within a single cycle of a PWM signal provided by an embodiment of the present application;

FIG. 4 is a preset schematic diagram of a phase point within a single cycle of a 2ASK signal provided by an embodiment of the present application;

FIG. 5 is a schematic flowchart of a demodulation method for a 2ASK signal provided in an embodiment of the present application;

FIG. 6 is a block diagram of modules of an electronic device provided in an embodiment of the present application;

FIG. 7 is a module block diagram of a computer-readable storage medium provided by an embodiment of the present application.

【Detailed ways】

In order to make the purpose, technical solutions and advantages of the application more obvious and understandable, the following will clearly and completely describe the application in conjunction with the embodiments of the application and the corresponding drawings, wherein the same or similar symbols throughout represent the same or similar elements or elements having the same or similar functions. It should be understood that the various embodiments of the application described below are only used to explain the application, and are not intended to limit the application, that is, based on the various embodiments of the application, those skilled in the art will not make an inventive step. All other embodiments obtained under the premise of labor all belong to the protection scope of this application. In addition, the technical features involved in the various embodiments of the present application described below may be combined with each other as long as they do not constitute a conflict with each other.

Wireless charging system is an important form of wireless communication system. In a wireless charging system based on the Qi standard (a wireless charging standard), the transmission of modulation signals from the energy receiving end to the energy sending end is realized by means of 2ASK (binary amplitude keying), that is, the energy receiving end will transmit the modulated signal to the energy sending end. 2ASK signal is transmitted; wherein, the modulated signal is an unmodulated/original signal that needs to be modulated. The formation process of the 2ASK signal is as follows: the energy sending end provides the carrier signal (usually a high-frequency sine wave signal) to the energy receiving end; the energy receiving end modulates the modulating signal into the carrier signal through 2ASK, thus forming an It can be seen that the carrier frequency (that is, the frequency of the carrier signal) is provided by the energy transmitting end, and its range is usually 80-205KHz, which is not fixed. In practical applications, on the one hand, the carrier signal provided by the energy transmitting end is not a sine wave, but has a large number of high-order harmonics; on the other hand, due to problems such as coil coupling between the energy transmitting end and the energy receiving end, the As a result, the envelope of the 2ASK signal will be deformed in both positive and negative half axes.

In the related art, demodulation methods for modulated signals can generally be classified into two types, which are traditional demodulation methods and new demodulation methods. Among them, the traditional demodulation method will perform quadrature decomposition on the modulated signal to obtain the co-directional component and the quadrature component, and take the square root of the square sum of the co-directional component and the quadrature component respectively, and then remove the DC component; for this As far as this demodulation method is concerned, it cannot demodulate the modulated signal whose envelope has been damaged to a certain extent (for example, the envelope of the modulated signal is deformed in both positive and negative half axes, and/or the The envelopes are inconsistent on the positive and negative half axes, and/or the amplitude of the envelope of the modulated signal on the positive and negative half axes is very small), and operations such as square sum and opening are required, which will lead to a large demodulation overhead, less efficient. Although the new demodulation method optimizes the square and square root operations in the traditional demodulation method, there are still a series of other operations related to orthogonal decomposition, which will also lead to high demodulation overhead and low efficiency, and this This demodulation method also has higher requirements on the signal sampling frequency. It can be seen that no matter it is a traditional demodulation method or a new demodulation method, the demodulation overhead is large and the efficiency is low. To this end, an embodiment of the present application provides a method for demodulating a 2ASK signal. Here, it is necessary to explain that the demodulation method of the 2ASK signal can be applied to any communication system that needs to demodulate the 2ASK signal, and the demodulation method of the 2ASK signal is not only applicable to the case where the carrier signal is known, but also applicable to In the case where the carrier signal is unknown; wherein, when the 2ASK signal is generated by the communication system itself, the carrier signal is known (for example, the communication system is a wireless charging system based on the Qi standard, and the energy transmitting end in it will generate the carrier signal); When the 2ASK signal is received from the outside by the communication system, that is, when the 2ASK signal is generated by a system other than the communication system, the carrier signal is unknown (for example, the communication system is an NFC Listen device, although it cannot generate the carrier signal itself, but The carrier signal can be accurately restored by a phase-locked loop, etc.).

Before elaborating the demodulation method of the 2ASK signal provided by the embodiment of the present application in detail, first briefly explain the principle of the demodulation method of the 2ASK signal provided by the embodiment of the present application. Specifically, the wireless charging system based on the Qi standard is used as the The communication system is described; wherein, the wireless charging system includes an energy sending end and an energy receiving end.

Please refer to FIG. 1 . FIG. 1 is a module block diagram of an energy sending end provided by an embodiment of the present application. The energy transmitting end in the wireless charging system includes a PWM (Pulse Width Modulation, pulse width modulation) circuit, a drive circuit connected to the PWM circuit, an oscillation circuit connected to the drive circuit, a sampling circuit connected to the oscillation circuit, and a sampling circuit, PWM circuit connected to the demodulation circuit. In practical applications, the energy transmitting end generates an alternating electromagnetic field through a PWM circuit, a drive circuit and an oscillating circuit (equivalent to providing a carrier signal for the energy receiving end), and then the energy receiving end in the wireless charging system transmits the energy to the energy transmitting end. The modulated signal at the end is modulated into the electromagnetic field, and finally the energy transmitting end collects the 2ASK signal from the electromagnetic field through the sampling circuit, and demodulates the 2ASK signal through the demodulation circuit to obtain the modulated signal; among them, if the energy receiving end is in Before the modulated signal is modulated into the electromagnetic field, the modulated signal is encoded, and the process of demodulating the 2ASK signal by the energy transmitting end through the demodulation circuit also includes a decoding link.

Specifically, the method for the demodulation circuit to demodulate the 2ASK signal is actually the demodulation method for the 2ASK signal provided by the embodiment of the present application, and the more detailed demodulation process is: according to the carrier signal, generate frequency and carrier signal The same PWM signal (here, since the communication system is a wireless charging system based on the Qi standard, the carrier signal is known, then we can directly generate a PWM signal with the same frequency as the carrier signal according to the carrier signal; of course , if the communication system is not a wireless charging system based on the Qi standard, that is, the carrier signal is unknown, then we can first accurately restore the carrier signal through a phase-locked loop, and then generate a frequency and carrier signal based on the restored carrier signal the same PWM signal); according to the PWM signal (or in other words, with the PWM signal as a reference), obtain the maximum amplitude phase point and the minimum amplitude phase point within a single cycle of the 2ASK signal; according to the obtained maximum amplitude phase point and minimum amplitude phase point Amplitude and phase points, convert the 2ASK signal into two DC signals; respectively filter the obtained two DC signals to obtain two target signals; perform signal splicing processing on the obtained two target signals to obtain modulated signals; , if the modulated signal is encoded before being modulated into the carrier signal, then the obtained two target signals need to be decoded before the signal splicing process.

It can be understood that, according to the concept of signal modulation (that is, signal modulation is a signal processing method that makes certain characteristics of the carrier signal change with the change of the modulating signal), it can be known that the 2ASK signal is actually the carrier after the modulating signal changes. Signal. Since the PWM signal is generated according to the carrier signal (that is, the frequency of the carrier signal), the frequency characteristic (equivalent to the period characteristic) of the PWM signal is consistent with the carrier signal; further, since 2ASK is a type of amplitude modulation, and the 2ASK signal is actually The above is the carrier signal after changing with the modulation signal, so the 2ASK signal has the same characteristics as the carrier signal except the amplitude and the carrier signal, such as frequency characteristics, which means that the frequency characteristics of the 2ASK signal are the same as the carrier signal ( or PWM signal) the same.

It can also be understood that since the carrier signal is generated by the communication system itself (that is, the wireless charging system according to the Qi standard), we can more easily control the frequency characteristics of the carrier signal. The important thing is that since the carrier signal is specifically generated by the energy sending end in the wireless charging system, the energy sending end can clearly lock the frequency characteristics of the carrier signal (such as the starting point of the cycle, etc.); however, in the generation process of the carrier signal In the process, both the drive circuit and the oscillation circuit are involved, and there are problems such as coil coupling between the energy receiving end and the energy transmitting end, which makes the oscillation characteristics of the carrier signal have great uncertainty (equivalent to the oscillation characteristics of the 2ASK signal also has great uncertainty). Therefore, in the demodulation method of the 2ASK signal provided in the embodiment of the present application, the characteristics of the same frequency characteristics between the PWM signal, the carrier signal and the 2ASK signal are utilized, and a plurality of first phase points are preset in a single cycle of the PWM signal , while taking the preset multiple first phase points as a reference, sampling multiple second phase points within a single period of the 2ASK signal (that is, between multiple first phase points and multiple second phase points one by one corresponding, and the first phase point is consistent with the corresponding second phase point in the time domain), and select the maximum amplitude phase point and the minimum amplitude phase point, and finally according to the selected maximum amplitude phase point and minimum amplitude phase point Phase point, which converts the 2ASK signal with periodicity and oscillation characteristics into two DC signals corresponding to the maximum amplitude phase point and the minimum amplitude phase point respectively, and sequentially filters, decodes, and splices the two DC signals. Operation, so as to obtain the modulation signal to be transmitted by the energy receiving end. On this basis, for a single period of the 2ASK signal, only the maximum amplitude phase point and the minimum amplitude phase point are processed accordingly, so the signal sampling frequency and data calculation amount in the entire demodulation process can be greatly reduced.

As an example, please refer to FIG. 2 , which is a preset schematic diagram of a phase point within a single cycle of a PWM signal provided by an embodiment of the present application (in FIG. 2 , P represents a phase point, and T represents a period). When multiple first phase points are preset in a single cycle of the PWM signal, four first phase points can be preset, which are P1, P2, P3 and P4 in Figure 2; where P1 is a phase with a phase of 0 degrees Point, located at the rising edge of a single cycle of the PWM signal; P2 is a phase point with a phase of 90 degrees, located at 1/2 of the high-level signal segment within a single cycle of the PWM signal; P3 is a phase point with a phase of 180 degrees, Located at the falling edge of a single cycle of the PWM signal; P4 is a phase point with a phase of 270 degrees, located at 1/2 of the low-level signal segment within a single cycle of the PWM signal.

As another example, please refer to FIG. 3 , which is another preset schematic diagram of a phase point within a single cycle of a PWM signal provided by an embodiment of the present application (in FIG. 3 , P represents a phase point, and T represents a period). When multiple first phase points are preset in a single cycle of the PWM signal, six first phase points can be preset, which are respectively P1, P2, P3, P4, P5 and P6 in Figure 3; wherein, P1 is the phase of The phase point of 0 degrees is located at the rising edge within a single cycle of the PWM signal; P2 is the phase point with a phase of 60 degrees, located at 1/3 of the high-level signal segment within a single cycle of the PWM signal; P3 is the phase of 120 degrees The phase point is located at 2/3 of the high-level signal segment within a single cycle of the PWM signal; P4 is a phase point with a phase of 180 degrees, located at the falling edge of a single cycle of the PWM signal; P5 is a phase with a phase of 240 degrees Point, located at 1/3 of the low-level signal segment within a single cycle of the PWM signal; P6 is a phase point with a phase of 300 degrees, located at 2/3 of the low-level signal segment within a single cycle of the PWM signal.

Based on this example, after 6 first phase points are preset in a single period of the PWM signal, the 6 second phase points in a single period of the 2ASK signal can be sampled with these 6 first phase points as a reference ( You can refer to FIG. 4, which is a preset schematic diagram of the phase points in a single cycle of the 2ASK signal provided by the embodiment of the present application; wherein, the 6 second phase points in a single cycle of the 2ASK signal are still represented by P1, P2, P3, and P4 , P5 and P6 represent). Since the frequency characteristics of the 2ASK signal, the carrier signal and the PWM signal are the same, the six second phase points in a single cycle of the 2ASK signal can be regarded as DC signals alone, and the amplitude changes reflect the envelope changes of the 2ASK signal.

Specifically, the second phase point in a single period of the 2ASK signal can be expressed by the following formula:

P _i =Acos(φ ₀ +φ _i );

Among them, P _i represents the i-th second phase point, A represents the modulation signal, and _φ0 represents the phase difference between the PWM signal and the 2ASK signal (equivalent to the carrier signal) (this phase difference exists naturally due to signal transmission and delay, etc. , which are different in different communication systems, and when the PWM signal is determined, it remains unchanged), φ _i represents the phase of the first phase point corresponding to the i-th second phase point, and i is A positive integer greater than 1. It can be understood that when P _i does not change, φ _i does not change, so cos(φ ₀ +φ _i ) does not change, which means that P _i is actually a similar DC , or a DC-like signal whose sampling frequency is the carrier frequency; then, when φ ₀ +φ _i in cos(φ ₀ +φ _i ) is equal to 0 degrees and 180 degrees, the amplitude of _Pi is the largest , the amplitude change of the 2ASK signal is also the most obvious, that is, when φ ₀ +φ _i is equal to 0 degrees and 180 degrees, the corresponding two P _i are the maximum amplitude phase point and the minimum amplitude phase point respectively; in practical applications, When there are no two second phase points where φ ₀ +φ _i is equal to 0 degree and 180 degree, we can take the two second phase points where φ ₀ +φ _i is closest to 0 degree and 180 degree.

In addition, it should be noted that, when determining the maximum amplitude phase point and the minimum amplitude phase point from multiple second phase points, it is not limited to a single period of the 2ASK signal, and can also be performed within multiple periods of the 2ASK signal sampling to cover more second phase points, so that the phase points where the maximum amplitude and the minimum amplitude appear can be locked more accurately.

Further, after determining the maximum amplitude phase point and the minimum amplitude phase point in the 2ASK signal, the 2ASK signal can be converted into two DC signals according to the maximum amplitude phase point and the minimum amplitude phase point, so that the two channels can be separately The DC signal is filtered; the purpose of the filter operation is to filter out the harmonics generated by magnetic field coupling, the unmodulated carrier amplitude, and other noises, and only retain the amplitude changes of the modulated signal. Specifically, when performing a filtering operation, a low-pass filter may be used to perform low-pass filtering first, and then a DC-removing filter is used to perform DC-removing filtering; or, a band-pass filter is directly used for filtering. Among them, the role of the low-pass filter is to filter out the frequency above 2ASK signal, and since the frequency of the 2ASK signal is up to 2KHz, in order to retain as much signal as possible, the cut-off frequency of the low-pass filter can be set to about 5KHz; In addition, the low-pass filter may adopt, but is not limited to, an IIR filter (ie, a recursive filter) and a FIR filter (ie, a non-recursive filter). A first-order IIR filter can be used as the DC removing filter, and the transfer function can be expressed as H(z)=1-z ⁻¹ /1-az ⁻¹ . It can be understood that the frequency of the 2ASK signal is up to 2KHz, and setting the cut-off frequency of the low-pass filter to 5KHz is a specific example, which is not uniquely limited in the embodiment of the present application, that is, the frequency of the 2ASK signal The highest value of and the cutoff frequency of the low-pass filter can be flexibly set according to actual application scenarios.

Through the foregoing, a basic understanding of the principle on which the 2ASK signal demodulation method provided in the embodiment of the present application is based. According to the principle based on the demodulation method of 2ASK signal provided by the embodiment of the present application, compared with the existing demodulation method, the demodulation method of the 2ASK signal provided by the embodiment of the present application does not need complex analog circuits, only in the demodulation It is enough to screen the maximum amplitude and minimum amplitude phase points before adjustment, but for a single period of 2ASK signal, only the maximum amplitude phase point and the minimum amplitude phase point are processed accordingly, so the cost and calculation of demodulation are greatly reduced The quantity reduces the cost and effectively simplifies the demodulation steps while ensuring the demodulation effect. Next, the demodulation method of the 2ASK signal provided by the embodiment of the present application will be described in detail.

Please refer to FIG. 5 . FIG. 5 is a schematic flowchart of a demodulation method for a 2ASK signal provided in an embodiment of the present application. It can be seen from FIG. 5 that the 2ASK signal demodulation method provided by the embodiment of the present application is applied to a communication system, and includes steps 501 to 504 as follows.

Step 501, acquire 2ASK signal.

In the embodiment of the present application, when demodulating the 2ASK signal, the 2ASK signal needs to be acquired first; wherein, the formation method of the 2ASK signal is: the modulated signal is modulated into the carrier signal by means of binary amplitude keying to obtain 2ASK signal.

Step 502: Convert the 2ASK signal into two DC signals according to the maximum amplitude phase point and the minimum amplitude phase point within a single cycle of the 2ASK signal.

In the embodiment of the present application, after the 2ASK signal is obtained, it is necessary to convert the 2ASK signal into two DC signals according to the maximum amplitude phase point and the minimum amplitude phase point within a single period of the 2ASK signal.

Step 503: Filter the two channels of direct current signals respectively to obtain two channels of target signals.

In the embodiment of the present application, after the 2ASK signal is converted into two channels of DC signals, the two channels of DC signals need to be filtered separately, so as to obtain two channels of target signals.

Step 504, performing signal splicing processing on the two channels of target signals to obtain modulated signals.

In the embodiment of the present application, after obtaining the two target signals, it is necessary to perform signal splicing processing on the two target signals, so as to obtain the modulated signal.

In the embodiment of the present application, the 2ASK signal is obtained first; then, according to the maximum amplitude phase point and the minimum amplitude phase point in a single period of the 2ASK signal, the 2ASK signal is converted into two DC signals; and then the two DC signals are respectively filtered to obtain two DC signals The target signal; finally, the signal splicing process is performed on the two target signals to obtain the modulated signal; wherein, the 2ASK signal is obtained by modulating the modulated signal into the carrier signal through binary amplitude keying. It can be seen that, in the process of demodulating the 2ASK signal in the embodiment of the present application, links such as orthogonal decomposition and square and square root in the existing demodulation method are not involved, so that the demodulation overhead can be effectively reduced, Thus, the demodulation efficiency can be greatly improved.

In some embodiments, step 502, converting the 2ASK signal into two DC signals according to the maximum amplitude phase point and the minimum amplitude phase point in a single cycle of the 2ASK signal may specifically include: generating a frequency and a carrier signal according to the carrier signal The same PWM signal; according to the PWM signal, obtain the maximum amplitude phase point and the minimum amplitude phase point in a single cycle of the 2ASK signal; convert the 2ASK signal into two DC signals according to the maximum amplitude phase point and the minimum amplitude phase point.

As an implementation, generating a PWM signal with the same frequency as the carrier signal according to the carrier signal may specifically include: if the carrier signal is known, generating a PWM signal with the same frequency as the carrier signal according to the carrier signal; if the carrier signal is unknown, Then the carrier signal is restored through the phase-locked loop; according to the carrier signal, a PWM signal with the same frequency as the carrier signal is generated; wherein, when the 2ASK signal is generated by the communication system, the carrier signal is known; when the 2ASK signal is received by the communication system from the outside , the carrier signal is unknown.

As an implementation manner, according to the PWM signal, obtaining the maximum amplitude phase point and the minimum amplitude phase point in a single cycle of the 2ASK signal may specifically include: preset multiple first phase points in a single cycle of the PWM signal; The first phase point is a reference, and a plurality of second phase points in a single cycle of the 2ASK signal are sampled; the maximum amplitude phase point and the minimum amplitude phase point are selected from the plurality of second phase points; wherein, the plurality of first phase There is a one-to-one correspondence between a point and a plurality of second phase points, and the first phase point is consistent with the corresponding second phase point in the time domain.

As a specific implementation of this embodiment, the second phase point can be expressed by the following formula:

P _i =Acos(φ ₀ +φ _i );

Among them, P _i represents the i-th second phase point, A represents the modulation signal, and _φ0 represents the phase difference between the PWM signal and the 2ASK signal (equivalent to the carrier signal) (this phase difference exists naturally due to signal transmission and delay, etc. , which are different in different communication systems, and when the PWM signal is determined, it remains unchanged), φ _i represents the phase of the first phase point corresponding to the i-th second phase point, and i is A positive integer greater than 1. On this basis, selecting a maximum amplitude phase point and a minimum amplitude phase point from a plurality of second phase points may specifically include: comparing cos(φ ₀ +φ _i ) of a plurality of second phase points; As a result, two second phase points where φ ₀ +φ _i are equal to (or closest to) 0 degrees and 180 degrees are selected from a plurality of second phase points; wherein, the selected second phase point is the maximum amplitude Phase point, the selected second phase point is the minimum amplitude phase point; for example, the second phase point where φ ₀ +φ _i is equal to (or closest to) 0 degrees is the maximum amplitude phase point, φ ₀ +φ _i The second phase point equal to (or closest to) 180 degrees is the minimum amplitude phase point.

As a specific implementation of this embodiment, presetting a plurality of first phase points within a single period of the PWM signal may specifically include: presetting four first phase points within a single period of the PWM signal; wherein, the first The first phase point is located at the rising edge of a single period of the PWM signal, the second first phase point is located at 1/2 of the high level within a single period of the PWM signal, and the third first phase point is located at a single period of the PWM signal At the falling edge of the PWM signal, the fourth first phase point is located at 1/2 of the low level in a single period of the PWM signal.

As another specific implementation of this embodiment, presetting multiple first phase points within a single period of the PWM signal may specifically include: presetting six first phase points within a single period of the PWM signal; wherein, the first One first phase point is located at the rising edge of a single period of the PWM signal, the second first phase point is located at 1/3 of the high level within a single period of the PWM signal, and the third first phase point is located at the single period of the PWM signal At 2/3 of the high level in the cycle, the fourth first phase point is located at the falling edge of a single cycle of the PWM signal, and the fifth first phase point is located at 1/3 of the low level in a single cycle of the PWM signal , the sixth first phase point is located at 2/3 of the low level in a single cycle of the PWM signal.

It should be understood that the above-mentioned implementation is only a preferred implementation of the embodiment of the present application, and is not the only limitation of the specific process of step 502 in the embodiment of the present application; for this, those skilled in the art can , and flexibly set according to the actual application scenario.

In addition, if the modulated signal is encoded before being modulated into the carrier signal, before step 504, that is, before performing signal splicing processing on the two channels of target signals, it may further include: decoding the two channels of target signals.

Please refer to FIG. 6 . FIG. 6 is a block diagram of modules of an electronic device provided by an embodiment of the present application.

As shown in FIG. 6, the embodiment of the present application also provides an electronic device 600, including a storage device 610 and at least one processor 620; wherein, the storage device 610 is used to store at least one program, and when at least one program is used by at least one When the processors 620 are executed, at least one processor 620 is made to execute the 2ASK signal demodulation method provided by the embodiment of the present application.

In some embodiments, the electronic device 600 may further include a bus 630 for communication connection between the storage device 610 and at least one processor 620 .

Please refer to FIG. 7 , which is a block diagram of a computer-readable storage medium provided by an embodiment of the present application.

As shown in FIG. 7 , the embodiment of the present application also provides a computer-readable storage medium 700, on which an executable instruction 710 is stored. When the executable instruction 710 is executed, the embodiment of the present application is executed. The demodulation method of the 2ASK signal is provided.

The steps of the methods or algorithms described in connection with the embodiments disclosed herein may be directly implemented by hardware, software modules executed by a processor, or a combination of both. Software modules can be placed in random access memory (RAM), internal memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, removable disk, CD-ROM, or any other Any other known storage medium.

In the above embodiments, all or part of them may be implemented by software, hardware, firmware or any combination thereof. When implemented using software, it may be implemented in whole or in part in the form of a computer program product. A computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on the computer, the processes or functions according to the present application will be generated in whole or in part. A computer can be a general purpose computer, special purpose computer, computer network, or other programmable device. Computer instructions may be stored in or transmitted from one computer-readable storage medium to another computer-readable storage medium, e.g. Coaxial cable, optical fiber, digital subscriber line) or wireless (such as infrared, wireless, microwave, etc.) to another website site, computer, server or data center. The computer-readable storage medium may be any available medium that can be accessed by a computer, or a data storage device such as a server, a data center, etc. integrated with one or more available media. Usable media may be magnetic media (eg, floppy disk, hard disk, magnetic tape), optical media (eg, DVD), or semiconductor media (eg, Solid State Disk), among others.

It should be noted that each embodiment in the content of this application is described in a progressive manner, each embodiment focuses on the difference from other embodiments, and the same and similar parts of each embodiment refer to each other That's it. As for the product embodiment, since it is similar to the method embodiment, the description is relatively simple, and for the related parts, please refer to the description of the method embodiment.

It should also be noted that in the content of this application, relative terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that these entities or operations, any such actual relationship or order exists. Furthermore, the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus comprising a set of elements includes not only those elements, but also includes elements not expressly listed. other elements of or also include elements inherent in such a process, method, article, or device. Without further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article or apparatus comprising said element.

The above description of the disclosed embodiments enables those skilled in the art to implement or use the contents of the application. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined in the content of the application can be used in other embodiments without departing from the spirit or scope of the content of the application. accomplish. Therefore, the content of the application will not be limited to the embodiments shown in the content of the application, but will conform to the broadest scope consistent with the principles and novel features disclosed in the content of the application.

Claims (8)

1. A demodulation method of a 2ASK signal, applied to a communication system, comprising:

acquiring a 2ASK signal; wherein the 2ASK signal is obtained by modulating a modulation signal into a carrier signal through binary amplitude keying;

generating a PWM signal with the same frequency as the carrier signal according to the carrier signal;

presetting a plurality of first phase points in a single period of the PWM signal;

sampling a plurality of second phase points in a single period of the 2ASK signal by taking the plurality of first phase points as references; wherein the first phase points and the second phase points are in one-to-one correspondence, and the first phase points and the corresponding second phase points are consistent in time domain;

selecting a maximum amplitude phase point and a minimum amplitude phase point from the plurality of second phase points;

converting the 2ASK signal into two paths of direct current signals according to the maximum amplitude phase point and the minimum amplitude phase point;

respectively filtering the two paths of direct current signals to obtain two paths of target signals;

and performing signal splicing processing on the two paths of target signals to obtain the modulation signal.

2. The method for demodulating a 2ASK signal according to claim 1, wherein said generating a PWM signal having the same frequency as said carrier signal from said carrier signal comprises:

if the carrier signal is known, generating a PWM signal with the same frequency as the carrier signal according to the carrier signal; wherein the carrier signal is known when the 2ASK signal is generated by the communication system;

if the carrier signal is unknown, the carrier signal is restored through a phase-locked loop; wherein the carrier signal is unknown when the 2ASK signal is received by the communication system from outside;

and generating a PWM signal with the same frequency as the carrier signal according to the carrier signal.

3. The method of demodulating a 2ASK signal according to claim 1, wherein said second phase point is represented by the following formula:

P _i ＝Acos(φ ₀ +φ _i )；

wherein P is _i Represents the ith said second phase point, A represents said modulated signal, phi ₀ Represents the phase difference, phi, between the PWM signal and the 2ASK signal _i Representing a phase of the first phase point corresponding to the i-th second phase point, and i being a positive integer greater than 1;

the selecting a maximum amplitude phase point and a minimum amplitude phase point from the plurality of second phase points, comprising:

cos (. Phi.) at the plurality of second phase sites ₀ +φ _i ) Comparing;

selecting phi from the plurality of second phase points based on the comparison ₀ +φ _i Two said second phase points equal to 0 degrees and 180 degrees; wherein one of the second phase points selected is a maximum amplitude phase point and the other of the second phase points selected is a minimum amplitude phase point.

4. The method for demodulating a 2ASK signal according to claim 1, wherein said presetting a plurality of first phase points in a single period of said PWM signal includes:

presetting four first phase points in a single period of the PWM signal; the first phase point is positioned at the rising edge of the single period of the PWM signal, the second phase point is positioned at 1/2 of the high level of the single period of the PWM signal, the third phase point is positioned at the falling edge of the single period of the PWM signal, and the fourth phase point is positioned at 1/2 of the low level of the single period of the PWM signal.

5. The method for demodulating a 2ASK signal according to claim 1, wherein said presetting a plurality of first phase points in a single period of said PWM signal includes:

presetting six first phase points in a single period of the PWM signal; wherein a first phase point is positioned at a rising edge in a single period of the PWM signal, a second phase point is positioned at 1/3 of a high level in the single period of the PWM signal, a third phase point is positioned at 2/3 of the high level in the single period of the PWM signal, a fourth phase point is positioned at a falling edge in the single period of the PWM signal, a fifth phase point is positioned at 1/3 of a low level in the single period of the PWM signal, and a sixth phase point is positioned at 2/3 of the low level in the single period of the PWM signal.

6. The method for demodulating a 2ASK signal according to claim 1, wherein if said modulated signal is encoded before being modulated into said carrier signal, said performing signal splicing processing on said two paths of target signals further comprises:

and decoding the two paths of target signals.

7. An electronic device comprising a memory device and at least one processor; the storage means is for storing at least one program and which when executed by the at least one processor causes the at least one processor to perform the method of any of claims 1-6.

8. A computer readable storage medium having stored thereon executable instructions which when executed perform the method of any of claims 1-6.