CN111615187A - Wireless signal synchronization method - Google Patents
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Abstract
The application is applicable to the technical field of signal synchronization, and provides a wireless signal synchronization method, which comprises the following steps: synchronously calculating each sampling point of the received wireless signals to obtain a synchronous calculation result; if the synchronous calculation result meets the synchronous success standard, verifying the synchronous correctness of the wireless signal; and determining whether to terminate the synchronous calculation according to the verification result of the synchronous correctness. By the method, the node for terminating the synchronous calculation is judged, the probability of missing the target synchronous position in the process of verifying the correctness of the false alarm synchronous result is reduced, and the synchronous omission ratio is greatly reduced.
Description
Technical Field
The present application belongs to the technical field of signal synchronization, and in particular, to a synchronization method for wireless signals, a terminal device, and a computer-readable storage medium.
Background
In wireless communications, data is often transmitted in the form of data frames. When the receiving end receives the data frame, the data content of the transmitting end can be recovered after signal synchronization.
However, the traditional synchronous calculation method is simple, so that the non-target signal is easy to exceed the preset threshold after synchronous calculation, and false alarm synchronization is formed.
When false alarm synchronization occurs, the receiving end needs to terminate the synchronization calculation and verify the correctness of the false alarm synchronization. In the process of verifying the false alarm synchronization correctness, the target synchronization position of the real data frame may be missed, so that the technical problem of high missing rate of the existing synchronization method is solved.
Disclosure of Invention
In view of the above, embodiments of the present application provide a method for synchronizing wireless signals, a terminal device, and a computer-readable storage medium, which can solve the problem that a receiving end needs to terminate synchronization calculation and verify the correctness of false alarm synchronization when false alarm synchronization occurs. In the process of verifying the false alarm synchronization correctness, the target synchronization position of the real data frame may be missed, so that the technical problem of high missing rate of the existing synchronization method is solved.
A first aspect of an embodiment of the present application provides a method for synchronizing a wireless signal, including:
performing synchronous calculation on each sampling point of the received wireless signal to obtain a synchronous calculation result;
if the synchronous calculation result meets the synchronous success standard, verifying the synchronous correctness of the wireless signal;
and determining whether to terminate the synchronous calculation according to the verification result of the synchronous correctness.
A second aspect of an embodiment of the present application provides a synchronization apparatus for wireless signals, including:
the calculating unit is used for synchronously calculating each sampling point of the received wireless signal to obtain a synchronous calculation result;
the verification unit is used for verifying the synchronization correctness of the wireless signal if the synchronization calculation result meets the synchronization success standard;
and the judging unit is used for determining whether to terminate the synchronous calculation according to the verification result of the synchronous correctness.
A third aspect of embodiments of the present application provides a terminal device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, where the processor implements the steps of the method according to the first aspect when executing the computer program.
A fourth aspect of embodiments of the present application provides a computer-readable storage medium, which stores a computer program, and the computer program, when executed by a processor, implements the steps of the method according to the first aspect.
Compared with the prior art, the embodiment of the application has the advantages that: in the method, each sampling point of a received wireless signal is synchronously calculated to obtain a synchronous calculation result; if the synchronous calculation result meets the synchronous success standard, verifying the synchronous correctness of the wireless signal; and determining whether to terminate the synchronous calculation according to the verification result of the synchronous correctness. By the method, the node for terminating the synchronous calculation is judged, the probability of missing the target synchronous position in the process of verifying the correctness of the false alarm synchronous result is reduced, and the synchronous omission ratio is greatly reduced.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the related technical descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic diagram illustrating a time axis of a signal in a wireless signal provided by the present application;
fig. 2 shows a schematic flow chart of a method for synchronization of wireless signals provided by the present application;
fig. 3 is a schematic diagram illustrating a physical layer header in a data frame of a synchronization method for a wireless signal provided in the present application;
fig. 4 shows a specific schematic flowchart of step 202 in a method for synchronizing wireless signals provided by the present application;
fig. 5 shows a specific schematic flowchart of step 203 in a method for synchronizing wireless signals provided by the present application;
fig. 6 is a schematic diagram illustrating a synchronization calculation process in a synchronization method of a wireless signal provided in the present application;
FIG. 7 is a schematic flow chart diagram illustrating another method of synchronization of wireless signals provided herein;
FIG. 8 is a schematic flow chart diagram illustrating another method of synchronization of wireless signals provided herein;
fig. 9 shows a specific schematic flowchart of step 704 in a method for synchronizing wireless signals provided by the present application;
FIG. 10 is a schematic flow chart diagram illustrating another method of synchronization of wireless signals provided herein;
fig. 11 is a schematic diagram illustrating a synchronization apparatus for wireless signals provided by the present application;
fig. 12 shows a schematic diagram of a terminal device according to an embodiment of the present application.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the present application. It will be apparent, however, to one skilled in the art that the present application may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present application with unnecessary detail.
It will be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It should also be understood that the term "and/or" as used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.
As used in this specification and the appended claims, the term "if" may be interpreted contextually as "when", "upon" or "in response to" determining "or" in response to detecting ". Similarly, the phrase "if it is determined" or "if a [ described condition or event ] is detected" may be interpreted contextually to mean "upon determining" or "in response to determining" or "upon detecting [ described condition or event ]" or "in response to detecting [ described condition or event ]".
Furthermore, in the description of the present application and the appended claims, the terms "first," "second," "third," and the like are used for distinguishing between descriptions and not necessarily for describing or implying relative importance.
Reference throughout this specification to "one embodiment" or "some embodiments," or the like, means that a particular feature, structure, or characteristic described in connection with the embodiment is included in one or more embodiments of the present application. Thus, appearances of the phrases "in one embodiment," "in some embodiments," "in other embodiments," or the like, in various places throughout this specification are not necessarily all referring to the same embodiment, but rather "one or more but not all embodiments" unless specifically stated otherwise. The terms "comprising," "including," "having," and variations thereof mean "including, but not limited to," unless expressly specified otherwise.
In wireless communications, data is often transmitted in the form of data frames. When the receiving end receives the data frame, the data content of the transmitting end can be recovered after signal synchronization.
However, the traditional synchronous calculation method is simple, so that the non-target signal is easy to exceed the preset threshold after synchronous calculation, and false alarm synchronization is formed. When false alarm synchronization occurs, the receiving end needs to terminate the synchronization calculation and verify the correctness of the false alarm synchronization. In the process of terminating the synchronization calculation and verifying the false alarm synchronization correctness, the target synchronization position of the data frame may be missed, so that the real data frame cannot be synchronized. For example: referring to fig. 1, fig. 1 shows a schematic diagram of a signal time axis in a wireless signal provided by the present application. As shown in fig. 1, t4 is the start time of a real signal, a signal from the left end to t4 on the time axis is an interference signal, a signal from t4 to the right end on the time axis is a real signal, when the receiving end performs synchronization calculation according to STF in a time interval t1 to t2, if false alarm synchronization occurs, the receiving end needs to verify the synchronization correctness according to LTF in a time interval t3 to t5, but the receiving end cannot perform signal synchronization on the real signal due to missing the start time t4 of the real signal, and the real data frame signal is missed.
In view of the above, embodiments of the present application provide a method for synchronizing wireless signals, a terminal device, and a computer-readable storage medium, which can solve the problem that a receiving end needs to terminate synchronization calculation and verify the correctness of false alarm synchronization when false alarm synchronization occurs. In the process of verifying the false alarm synchronization correctness, the target synchronization position of the real data frame may be missed, so that the technical problem of high missing rate of the existing synchronization method is solved.
Referring to fig. 2, fig. 2 is a schematic flow chart illustrating a method for synchronizing wireless signals according to the present application.
As shown in fig. 2, the method may include the steps of:
step 201, performing synchronous calculation on each sampling point of the received wireless signal to obtain a synchronous calculation result.
The radio signal is a data frame modulated by Orthogonal Frequency Division Multiplexing (OFDM). Fig. 3 shows a structure of the data frame, please refer to fig. 3, and fig. 3 shows a schematic diagram of a physical layer header in the data frame of a synchronization method for wireless signals according to the present application. As shown in fig. 3, the physical layer header of the data frame includes three parts: a Short Training Field (STF), a Long Training Field (LTF), and a SIGNAL. The STF is used for timing estimation and coarse frequency offset estimation, and the LTF is used for fine frequency offset estimation and channel estimation. And after the receiving end receives the wireless signal, converting the wireless signal into a digital signal through a digital-to-analog converter, wherein the digital signal comprises a plurality of sampling points.
And the receiving end carries out synchronous calculation according to the STF. The method of the synchronous calculation includes, but is not limited to, an autocorrelation operation, a cross-correlation operation, or a recursive algorithm, for example: the wireless signal self-characteristic is used for operation, and according to the characteristic that the first half data of the short training sequence is the conjugate of the second half data multiplied by "-j", a method of circular sliding correlation addition is adopted for frame synchronization, and the local training sequence and the received signal can also be used for correlation operation.
It should be noted that, in the present application, synchronization calculation is continuously performed on a wireless signal before synchronization is determined to be correct, so as to prevent missing a sampling point of a target synchronization position when false alarm synchronization occurs. In the prior art, after the synchronous calculation result meets the synchronous success standard, the synchronous calculation is terminated, and the sampling point of the target synchronous position is easily missed.
Step 202, if the synchronization calculation result meets the synchronization success standard, verifying the synchronization correctness of the wireless signal.
Because the rule of the synchronization calculation is generally simpler and has lower complexity, the synchronization calculation result of the interference signal can also meet the synchronization success standard after some interference signals are calculated by the synchronization rule. Therefore, after the synchronization calculation result meets the synchronization success standard, the synchronization correctness of the wireless signal needs to be verified to prevent the mis-synchronization.
Specifically, the synchronization success criteria include, but are not limited to, that the first synchronization calculation result of the current sampling point exceeds a preset threshold or other conditions. Preferably, the present embodiment uses the result of the first synchronization calculation of the current sampling point exceeding the preset threshold as the synchronization success criterion. Wherein the value of the synchronization calculation comprises a combination of one or more of a signal power, a calculation of signal autocorrelation, or a calculation of signal cross-correlation.
The present implementation compares each value of the synchronization calculation result with the preset threshold. And when the first synchronous calculation result exceeds a preset threshold, the first synchronous calculation result meets the synchronous success standard.
Optionally, after the synchronization calculation result meets the synchronization success criterion, the method further includes: and updating the preset threshold according to the maximum value of the synchronous calculation result in a first synchronization process, wherein the first synchronization process refers to a calculation process within a preset time length after the first synchronization calculation result exceeds the preset threshold, and the maximum value of the synchronous calculation result in the first synchronization process is the maximum value of the synchronous calculation result within the preset time length.
And when the first synchronization calculation result meets the synchronization success standard, updating the preset threshold according to the maximum value of the synchronization calculation result in the first synchronization process.
Specifically, the updating the preset threshold according to the maximum value of the synchronous calculation result in the first synchronization process includes: taking the maximum value of the synchronous calculation result as the preset threshold; or after the maximum value of the synchronous calculation result is subjected to linear calculation, the maximum value is used as the preset threshold. Other calculation methods may be performed on the maximum value of the synchronization calculation result, which is not limited herein.
Specifically, the verifying the synchronization correctness of the current sampling point includes the following steps, please refer to fig. 4, and fig. 4 shows a specific schematic flowchart of step 202 in a synchronization method of a wireless signal provided by the present application.
Step 2021, obtaining characteristic information in the wireless signal, where the characteristic information includes preamble field information and channel estimation result.
And when the synchronization calculation result meets the synchronization success standard, the receiving end enters the next synchronization process, wherein the synchronization process comprises but is not limited to fine frequency synchronization, maximum path estimation, channel estimation, demodulation decoding and the like. In the synchronization process, the embodiment acquires a plurality of pieces of characteristic information in the current sampling point, and judges the synchronization correctness of the current sampling point. The characteristic information includes, but is not limited to, preamble field information, channel estimation result, Power Delay Profile (PDP), and the like. For example:
when the characteristic information is leading domain information, because the leading domain information contains a check value of the current data frame, if the leading domain information is checked correctly, the current sampling point is considered to be synchronous correctly, otherwise, the current sampling point is considered to be synchronous incorrectly.
Secondly, when the characteristic information is a PDP (plasma display Panel) spectrum, in wireless communication, as there are theoretically infinite signal paths between the receiving end and the transmitting end, the path directly connected between the receiving end and the transmitting end is shortest, and the signal intensity is strongest. If the signal energy of a certain path is far greater than that of other paths in the PDP spectrum, the current sampling point is considered to be correctly synchronized, otherwise, the current sampling point is considered to be wrongly synchronized.
And thirdly, when the characteristic information is a channel estimation result, if the channel estimation result conforms to an expected structure, the synchronization of the current sampling point is considered to be correct, otherwise, the synchronization of the current sampling point is considered to be wrong.
Step 2022, according to the comparison result between the feature information and the preset feature threshold, determining the synchronization correctness of the wireless signal.
And step 203, determining whether to terminate the synchronous calculation according to the verification result of the synchronous correctness.
Methods of calculating the synchronization position of a wireless signal include, but are not limited to, synchronization algorithms such as autocorrelation detection and recursive algorithms.
Specifically, the determining whether to terminate the synchronization calculation according to the verification result of the synchronization correctness includes the following steps, please refer to fig. 5, and fig. 5 shows a specific schematic flowchart of step 203 in a synchronization method of a wireless signal provided by the present application.
Step 2031, if the verification result of the first synchronization process is correct, selecting a target synchronization position according to the corresponding position of the maximum value of the synchronization calculation result in the first synchronization process, and terminating the synchronization calculation, where the target synchronization position is the correct starting position of the current data frame.
And if the verification result of the synchronization correctness in the first synchronization process is correct, the current sampling point is represented as the sampling point of the real signal. At this time, the target synchronization position can be selected according to the corresponding position of the maximum value of the synchronization calculation result in the first synchronization process. The target synchronization position may be a corresponding position of the maximum value of the synchronization calculation result or a position derived from the corresponding position of the maximum value of the synchronization calculation result. For example: referring to fig. 6, fig. 6 is a schematic diagram illustrating a synchronization calculation process in a synchronization method for wireless signals according to the present application. As shown in fig. 6, a 'and B' are the original waveforms of the wireless signal, and A, B, C, D and E are the curves: the variation curves of the result values corresponding to the original waveform at different times are calculated synchronously. A is the synchronous calculation result corresponding to the starting position of the wireless signal and A' is the starting position of the wireless signal. B is the maximum value of the synchronous calculation result, B' is the corresponding position of the maximum value of the synchronous calculation result in the wireless signal, and E is the calculation node of which the calculation result exceeds the preset threshold. A to C are calculation processes within a preset time length, namely a first synchronization process. And taking the maximum value of the synchronous calculation result in the preset time length as the maximum value of the synchronous calculation result in the first synchronous process, namely B. And the synchronization correctness process for verifying the first synchronization process is arranged between the C and the D. Between a 'and B' is a short training sequence STF for the radio signal. When the short training sequence STF is finished, the synchronous calculation result reaches the maximum value. When the verification result of the first synchronization process is correct, the corresponding position of the maximum value of the synchronization calculation result may be used as the target synchronization position, i.e. B in fig. 3. A position near the corresponding position of the maximum value of the synchronization calculation result may also be taken as the target synchronization position, for example: and (2) taking a certain position after the synchronous calculation result starts to decline as the end point of the first synchronous process (because the corresponding position of the maximum value of the synchronous calculation result is inaccurate due to calculation delay in the synchronous calculation process, a preset value can be set according to priori knowledge or experimental data, and the position corresponding to the maximum value of the synchronous calculation result is added with the preset value to be taken as a target synchronous position so as to reduce the error of the corresponding position of the maximum value of the synchronous calculation result). The start position of the short training sequence STF may also be used as the target synchronization position, i.e., a' may be used as the target synchronization position. The specific process of acquiring the corresponding position of the maximum value of the synchronous calculation result is as follows: performing correlation or energy detection according to the training sequence of the wireless signal to obtain synchronous calculation results such as correlation values or energy value data; and when the synchronous calculation result exceeds a preset threshold, searching and outputting maximum value data of the synchronous calculation result curve after the synchronous calculation result exceeds the preset threshold and the position of the maximum value data, namely the point B.
When the synchronization calculation process of the wireless signal proceeds to the point D, the synchronization of the wireless signal is regarded as completed, and the synchronization calculation may be terminated. And recovering the data content of the transmitting end according to the target synchronous position.
And in the first synchronization process between A and C, the threshold of the calculation result is a preset threshold. And after the first synchronization process is finished, updating the preset threshold according to the maximum value of the synchronization calculation result in the first synchronization process. And if the second synchronous calculation result of the subsequent sampling point exceeds the updated preset threshold, updating the last updated preset threshold according to the maximum value of the synchronous calculation result in the second synchronous process. And determining whether to terminate the synchronization calculation according to a verification result of the synchronization correctness of the second synchronization process.
Step 2032, if the verification result of the first synchronization process is incorrect, restoring the preset threshold to the initial state.
And if the verification result of the first synchronization process is wrong, the current sampling point is represented as the sampling point of the interference signal, and the preset threshold needs to be restored to the initial state.
In this embodiment, the execution sequence of step 2031 and step 2032 is not limited.
In this embodiment, a synchronous calculation result is obtained by performing synchronous calculation on each sampling point of a received wireless signal; if the synchronous calculation result meets the synchronous success standard, verifying the synchronous correctness of the wireless signal; and determining whether to terminate the synchronous calculation according to the verification result of the synchronous correctness. By the method, the node for terminating the synchronous calculation is judged, the probability of missing the target synchronous position in the process of verifying the correctness of the false alarm synchronous result is reduced, and the synchronous omission ratio is greatly reduced.
Optionally, on the basis of the embodiment shown in fig. 2, after the synchronization calculation result meets the synchronization success criterion, the following steps are further included, please refer to fig. 7, and fig. 7 shows a schematic flowchart of another wireless signal synchronization method provided by the present application. Step 701, step 703 and step 704 in this embodiment are the same as step 201 to step 203 in the embodiment shown in fig. 2, and please refer to the related description of step 201 to step 203 in the embodiment shown in fig. 2, which is not repeated herein.
Step 701, performing synchronous calculation on each sampling point of the received wireless signal to obtain a synchronous calculation result.
Step 702, updating the preset threshold according to a maximum value of a synchronous calculation result in a first synchronous process, where the first synchronous process is a calculation process within a preset time length after the first synchronous calculation result exceeds the preset threshold, and the maximum value of the synchronous calculation result in the first synchronous process is the maximum value of the synchronous calculation result within the preset time length.
Step 703, verifying the synchronization correctness of the wireless signal.
Step 704, determining whether to terminate the synchronization calculation according to the verification result of the synchronization correctness.
In this embodiment, the preset threshold is updated according to the maximum value of the synchronization calculation result in the first synchronization process after the synchronization calculation result meets the synchronization success criterion. By the method, the self-adaptive threshold of signal synchronization is realized.
Optionally, on the basis of the embodiment shown in fig. 2, the synchronization method further includes the following steps, please refer to fig. 8, and fig. 8 shows a schematic flowchart of another wireless signal synchronization method provided in this application.
Step 801, performing synchronous calculation on each sampling point of the received wireless signal to obtain a synchronous calculation result.
Step 801 in this embodiment is the same as step 201 in the embodiment shown in fig. 2, and please refer to the related description of step 201 in the embodiment shown in fig. 2, which is not repeated herein.
Step 802, if the first synchronous calculation result of the current sampling point exceeds a preset threshold, updating the preset threshold according to the maximum value of the synchronous calculation result in the first synchronous process, wherein the first synchronous process is a calculation process after the first synchronous calculation result exceeds the preset threshold.
Step 803, in the process of verifying the synchronization correctness of the first synchronization process, if the second synchronization calculation result of the subsequent sampling point exceeds the updated preset threshold, updating the last updated preset threshold according to the maximum value of the synchronization calculation result in the second synchronization process; the second synchronization process refers to a calculation process after the second synchronization calculation result exceeds a preset threshold.
To prevent missing the synchronization position of the real data frame when verifying the false alarm synchronization. Therefore, in the embodiment, in the process of verifying the synchronization correctness of the first synchronization process, if the second synchronization calculation result of the subsequent sampling point exceeds the updated preset threshold, the verification of the synchronization correctness of the first synchronization process is stopped. And updating the last updated preset threshold according to the maximum value of the synchronous calculation result in the second synchronous process, and verifying the synchronous correctness of the second synchronous process. For example: as shown in fig. 1, the time interval corresponding to the synchronization correctness of the current sampling point is verified to be t3 to t5, and when the second synchronization calculation result corresponding to t4 exceeds the updated preset threshold, the verification of the synchronization correctness of the first synchronization process is stopped. And updating the last updated preset threshold according to the maximum value of the synchronous calculation result in the second synchronous process, and verifying the synchronous correctness in the second synchronous process.
By the mode, the self-adaptive threshold is realized in the whole synchronization process, and the synchronization missing detection is avoided.
Step 804, verifying the synchronization correctness of the second synchronization process, and determining whether to terminate the synchronization calculation according to the verification result of the synchronization correctness of the second synchronization process.
Specifically, the determining whether to terminate the synchronization calculation according to the verification result of the synchronization correctness of the second synchronization process includes the following steps, please refer to fig. 9, and fig. 9 shows a specific schematic flowchart of step 804 in the synchronization method for wireless signals provided by the present application.
Step 8041, if the verification result of the second synchronization process is correct, selecting a target synchronization position according to the corresponding position of the maximum value of the synchronization calculation result in the second synchronization process, and terminating the synchronization calculation.
When the verification result of the second synchronization process is correct, the corresponding position of the maximum value of the synchronization calculation result can be used as the target synchronization position. The position near the corresponding position of the maximum value of the synchronous calculation result can also be used as the target synchronous position (because the corresponding position of the maximum value of the synchronous calculation result is inaccurate due to calculation delay in the synchronous calculation process, a preset numerical value can be set according to priori knowledge or experimental data so as to reduce the error of the corresponding position of the maximum value of the synchronous calculation result). The start position of the short training sequence STF may also be used as the target synchronization position.
In step 8042, if the verification result of the second synchronization process is incorrect, the preset threshold is restored to the initial state.
And 805, repeatedly executing the step of updating the preset threshold according to the maximum value of the synchronous calculation result in the first synchronization process and subsequent steps if the first synchronous calculation result of the current sampling point exceeds the preset threshold.
In this embodiment, in the process of verifying the synchronization correctness of the wireless signal, if the second synchronization calculation result of the subsequent sampling point exceeds the updated preset threshold, the last updated preset threshold is updated according to the maximum value of the synchronization calculation result in the second synchronization process. And determining whether to terminate synchronous calculation according to the verification result of the synchronous correctness of the second synchronous process. By the mode, the node for stopping synchronous calculation is judged in combination with real-time updating of the self-adaptive threshold value, so that the probability of missing a target synchronous position in the process of verifying the correctness of a false alarm synchronous result is reduced, and the synchronous omission ratio is greatly reduced.
Optionally, on the basis of the embodiment shown in fig. 5, after the preset threshold is restored to the initial state, the method further includes the following steps, please refer to fig. 10, where fig. 10 shows a schematic flowchart of another wireless signal synchronization method provided by the present application.
Step 1001, performing synchronous calculation on each sampling point of the received wireless signal to obtain a synchronous calculation result.
Step 1001 in this embodiment is the same as step 201 in the embodiment shown in fig. 2, and please refer to the related description of step 201 in the embodiment shown in fig. 2, which is not repeated herein.
Step 1002, if the first synchronous calculation result of the current sampling point exceeds a preset threshold, updating the preset threshold according to the maximum value of the synchronous calculation result in a first synchronous process, wherein the first synchronous process is a calculation process after the first synchronous calculation result exceeds the preset threshold.
Step 1003, verifying the synchronization correctness of the wireless signal.
Step 1003 in this embodiment is the same as step 202 in the embodiment shown in fig. 2, and please refer to the related description of step 202 in the embodiment shown in fig. 2, which is not repeated herein.
And 1004, if the verification result of the first synchronization process is correct, selecting a target synchronization position according to the corresponding position of the maximum value of the synchronization calculation result in the first synchronization process, and terminating the synchronization calculation, wherein the target synchronization position is the correct initial position of the current data frame.
Step 1005, if the verification result of the first synchronization process is incorrect, restoring the preset threshold to the initial state.
Step 1004 and step 1005 in this embodiment are the same as step 2031 and step 2032 in the embodiment shown in fig. 5, and please refer to the related description of step 2031 and step 2032 in the embodiment shown in fig. 5, which is not described herein again.
And 1006, repeatedly executing the step of updating the preset threshold according to the maximum value of the synchronous calculation result in the first synchronization process and subsequent steps if the first synchronous calculation result of the current sampling point exceeds the preset threshold.
In this embodiment, the step of updating the preset threshold and the subsequent steps according to the maximum value of the synchronous calculation result in the first synchronization process by repeatedly executing the step of updating the preset threshold if the first synchronous calculation result of the current sampling point exceeds the preset threshold. By the method, the node for terminating the synchronous calculation is judged, so that the probability of missing the target synchronous position in the process of verifying the correctness of the false alarm synchronous result is reduced, and the synchronous omission ratio is greatly reduced.
Fig. 11 shows a schematic diagram of a wireless signal synchronization apparatus 11 provided in the present application, and fig. 11 shows a schematic diagram of a wireless signal synchronization apparatus provided in the present application, and the wireless signal synchronization apparatus shown in fig. 11 includes:
the calculating unit 111 is configured to perform synchronous calculation on each sampling point of the received wireless signal to obtain a synchronous calculation result;
a verification unit 112, configured to verify a synchronization correctness of the wireless signal if the synchronization calculation result meets a synchronization success criterion;
a judging unit 113, configured to determine whether to terminate the synchronization calculation according to a verification result of the synchronization correctness.
According to the wireless signal synchronization device, each sampling point of a received wireless signal is subjected to synchronous calculation to obtain a synchronous calculation result; if the synchronous calculation result meets the synchronous success standard, verifying the synchronous correctness of the wireless signal; and determining whether to terminate the synchronous calculation according to the verification result of the synchronous correctness. By the method, the node for terminating the synchronous calculation is judged, the probability of missing the target synchronous position in the process of verifying the correctness of the false alarm synchronous result is reduced, and the synchronous omission ratio is greatly reduced.
It should be understood that, the sequence numbers of the steps in the foregoing embodiments do not imply an execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.
Fig. 12 shows a schematic diagram of a terminal device according to an embodiment of the present application. As shown in fig. 12, a terminal device 12 of this embodiment includes: a processor 120, a memory 121 and a computer program 122, such as a synchronization program for wireless signals, stored in the memory 121 and executable on the processor 120. The processor 120, when executing the computer program 122, implements the steps in the above-mentioned embodiment of a method for synchronizing wireless signals, such as the steps 201 to 203 shown in fig. 2. Alternatively, the processor 120, when executing the computer program 122, implements the functions of the units in the above-mentioned device embodiments, such as the units 111 to 113 shown in fig. 11.
Illustratively, the computer program 122 may be divided into one or more units, which are stored in the memory 121 and executed by the processor 120 to accomplish the present application. The one or more units may be a series of computer program instruction segments capable of performing specific functions, which are used to describe the execution process of the computer program 122 in the terminal device 12. For example, the computer program 122 may be divided into an acquisition unit and a calculation unit, each unit having the following specific functions:
the calculating unit is used for synchronously calculating each sampling point of the received wireless signal to obtain a synchronous calculation result;
the verification unit is used for verifying the synchronization correctness of the wireless signal if the synchronization calculation result meets the synchronization success standard;
and the judging unit is used for determining whether to terminate the synchronous calculation according to the verification result of the synchronous correctness.
The terminal device 12 may be a computing device such as a mobile terminal, a desktop computer, a notebook, a palm computer, and a cloud server. The terminal device may include, but is not limited to, a processor 120 and a memory 121. Those skilled in the art will appreciate that fig. 12 is merely an example of one type of terminal device 12 and is not intended to limit one type of terminal device 12 and may include more or fewer components than shown, or some components may be combined, or different components, for example, the one type of terminal device may also include input output devices, network access devices, buses, etc.
The Processor 120 may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic, discrete hardware components, etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The storage 121 may be an internal storage unit of the terminal device 12, such as a hard disk or a memory of the terminal device 12. The memory 121 may also be an external storage device of the terminal device 12, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), and the like, provided on the terminal device 12. Further, the memory 121 may also include both an internal storage unit and an external storage device of the terminal device 12. The memory 121 is used for storing the computer program and other programs and data required by the kind of terminal equipment. The memory 121 may also be used to temporarily store data that has been output or is to be output.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-mentioned division of the functional units and modules is illustrated, and in practical applications, the above-mentioned function distribution may be performed by different functional units and modules according to needs, that is, the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-mentioned functions. Each functional unit and module in the embodiments may be integrated in one processing unit, or each unit may exist alone physically, or two or more units are integrated in one unit, and the integrated unit may be implemented in a form of hardware, or in a form of software functional unit. In addition, specific names of the functional units and modules are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working processes of the units and modules in the system may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or illustrated in a certain embodiment.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
In the embodiments provided in the present application, it should be understood that the disclosed terminal device and method may be implemented in other ways. For example, the above-described terminal device embodiments are merely illustrative, and for example, the division of the modules or units is only one logical function division, and there may be other divisions when actually implemented, for example, a plurality of units or components may be combined or may be integrated into another system, or some features may be omitted or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, all or part of the flow in the method of the embodiments described above can be realized by a computer program, which can be stored in a computer-readable storage medium and can realize the steps of the embodiments of the methods described above when the computer program is executed by a processor. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, usb disk, removable hard disk, magnetic disk, optical disk, computer Memory, Read-Only Memory (ROM), Random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution medium, and the like. It should be noted that the computer readable medium may contain content that is subject to appropriate increase or decrease as required by legislation and patent practice in jurisdictions, for example, in some jurisdictions, computer readable media does not include electrical carrier signals and telecommunications signals as is required by legislation and patent practice.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.
Claims (10)
1. A method for synchronizing a wireless signal, the method comprising:
performing synchronous calculation on each sampling point of the received wireless signal to obtain a synchronous calculation result;
if the synchronous calculation result meets the synchronous success standard, verifying the synchronous correctness of the wireless signal;
and determining whether to terminate the synchronous calculation according to the verification result of the synchronous correctness.
2. The synchronization method of claim 1, wherein the synchronization success criteria comprise: the first synchronous calculation result of the current sampling point exceeds a preset threshold;
if the synchronization calculation result meets the synchronization success standard, the method further comprises the following steps: and updating the preset threshold according to the maximum value of the synchronous calculation result in a first synchronization process, wherein the first synchronization process refers to a calculation process within a preset time length after the first synchronization calculation result exceeds the preset threshold, and the maximum value of the synchronous calculation result in the first synchronization process is the maximum value of the synchronous calculation result within the preset time length.
3. The synchronization method according to claim 2, wherein the determining whether to terminate the synchronization calculation according to the verification result of the synchronization correctness comprises:
if the verification result of the first synchronization process is correct, selecting a target synchronization position according to the corresponding position of the maximum value of the synchronization calculation result in the first synchronization process, and terminating the synchronization calculation, wherein the target synchronization position is the correct initial position of the current data frame;
and if the verification result of the first synchronization process is wrong, restoring the preset threshold to the initial state.
4. The synchronization method of claim 2, wherein the verifying the synchronization correctness of the wireless signal comprises:
in the process of verifying the synchronization correctness of the first synchronization process, if a second synchronization calculation result of a subsequent sampling point exceeds the updated preset threshold, updating the last updated preset threshold according to the maximum value of the synchronization calculation result in the second synchronization process; the second synchronization process refers to a calculation process after a second synchronization calculation result exceeds a preset threshold;
and verifying the synchronization correctness of the second synchronization process, and determining whether to terminate the synchronization calculation according to the verification result of the synchronization correctness of the second synchronization process.
5. The synchronization method according to claim 4, wherein the determining whether to terminate the synchronization calculation according to the verification result of the synchronization correctness of the second synchronization process comprises:
if the verification result of the second synchronization process is correct, selecting a target synchronization position according to the corresponding position of the maximum value of the synchronization calculation result in the second synchronization process, and terminating the synchronization calculation;
and if the verification result of the second synchronization process is wrong, restoring the preset threshold to the initial state.
6. The synchronization method according to claim 3 or 5, further comprising, after the restoring the preset threshold to the initial state:
and repeatedly executing the step of updating the preset threshold according to the maximum value of the synchronous calculation result in the first synchronization process and the subsequent steps if the first synchronous calculation result of the current sampling point exceeds the preset threshold.
7. The synchronization method of claim 1, wherein the verifying the synchronization correctness of the wireless signal comprises:
acquiring characteristic information in the wireless signal, wherein the characteristic information comprises preamble domain information and a channel estimation result;
and judging the synchronization correctness of the wireless signal according to the comparison result of the characteristic information and a preset characteristic threshold value.
8. An apparatus for synchronizing a wireless signal, the apparatus comprising:
the calculating unit is used for synchronously calculating each sampling point of the received wireless signal to obtain a synchronous calculation result;
the verification unit is used for verifying the synchronization correctness of the wireless signal if the synchronization calculation result meets the synchronization success standard;
and the judging unit is used for determining whether to terminate the synchronous calculation according to the verification result of the synchronous correctness.
9. A terminal device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that the processor implements the steps of the method according to any of claims 1 to 7 when executing the computer program.
10. A computer-readable storage medium, in which a computer program is stored which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 7.
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