CN111181890B - Method and device for synchronizing signals and server - Google Patents
Method and device for synchronizing signals and server Download PDFInfo
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- CN111181890B CN111181890B CN201911425980.9A CN201911425980A CN111181890B CN 111181890 B CN111181890 B CN 111181890B CN 201911425980 A CN201911425980 A CN 201911425980A CN 111181890 B CN111181890 B CN 111181890B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
- H04L27/2657—Carrier synchronisation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1851—Systems using a satellite or space-based relay
- H04B7/18519—Operations control, administration or maintenance
Abstract
The embodiment of the invention provides a method, a device and a server for synchronizing signals, which comprise the following steps: determining a first peak-to-average power ratio of a received signal according to a preset signal; if the first peak-to-average power ratio is larger than a preset first threshold value, performing frequency offset compensation on the received signal; determining a second peak-to-average power ratio of the received signal after frequency offset compensation according to a preset signal; and if the second peak-to-average power ratio is larger than a preset second threshold value, determining that the received signal is synchronous with the preset signal. In the method, a double threshold value is set for the determined average power ratio of the first peak value to the second peak value, signal synchronization is preliminarily determined through the first preset threshold value, then signal synchronization is finally determined through the second preset threshold value, the initial signal synchronization capability of the terminal can be improved under the conditions of large Doppler frequency and low signal-to-noise ratio of the received signals, and the success rate of capturing the initial synchronization signals is further improved.
Description
Technical Field
The present invention relates to the field of synchronization signal technology, and in particular, to a method, an apparatus, and a server for synchronizing a signal.
Background
In the related art, aiming at a traditional ground mobile communication system, a direct cross-correlation or a segmented cross-correlation algorithm is usually adopted to capture an initial synchronization signal; however, the low orbit satellite broadband mobile communication system has the problems of large doppler frequency offset and low signal-to-noise ratio, and in this case, the conventional correlation algorithm is still adopted to capture the initial synchronization signal, so that the performance is poor and the success rate of capturing the initial synchronization signal is low.
Disclosure of Invention
In view of this, an object of the present invention is to provide a method, an apparatus, and a server for synchronizing a signal, which can improve initial synchronization capability of a terminal under the conditions of a large doppler frequency offset and a low signal-to-noise ratio of a received signal, and further improve a success rate of acquiring an initial synchronization signal.
In a first aspect, an embodiment of the present invention provides a method for synchronizing signals, where the method includes:
determining a first peak-to-average power ratio of a received signal according to a preset signal;
if the first peak-to-average power ratio is larger than a preset first threshold value, performing frequency offset compensation on the received signal;
determining a second peak-to-average power ratio of the received signal after frequency offset compensation according to a preset signal;
and if the second peak-to-average power ratio is larger than a preset second threshold value, determining that the received signal is synchronous with the preset signal.
Further, the preset signal includes a low sampling rate preset signal; the step of determining a first peak-to-average power ratio of the received signal based on a predetermined signal comprises:
down-sampling the received signal to obtain a low-sampling signal;
performing correlation calculation on the low sampling rate preset signal and the low sampling signal to obtain a first correlation value of each point in the low sampling signal;
and obtaining the average power ratio of the first peak value of the low sampling signal according to the average value of the first correlation value of the current point and the first correlation value of the point before the current point.
Further, the step of performing frequency offset compensation on the received signal includes:
carrying out frequency offset estimation on a low sampling signal corresponding to a received signal to obtain a frequency offset value;
and performing frequency offset compensation on the received signal according to the frequency offset value.
Further, the method further comprises:
determining the signal-to-noise ratio of the received signal according to the first peak average power ratio and the frequency offset value;
and determining a second threshold value according to the signal-to-noise ratio.
Further, the preset signal includes a high sampling rate preset signal; the step of determining the second peak-to-average power ratio of the received signal after the frequency offset compensation according to the preset signal includes:
performing correlation calculation on the high-sampling preset signal and the received signal after frequency offset compensation to obtain a second correlation value of each point in the received signal after frequency offset compensation;
and obtaining a second peak-to-average power ratio of the received signal after frequency offset compensation according to the second correlation value of the current point and the average value of the second correlation values of points before the current point.
Furthermore, a plurality of preset signals are provided, and each preset signal carries a signal identifier; the step of determining synchronization of the received signal and the preset signal includes:
acquiring a signal identifier carried by each preset signal;
and determining the synchronous position of the received signal according to the signal identifier carried by each preset signal.
In a second aspect, an embodiment of the present invention provides an apparatus for synchronizing signals, where the apparatus includes:
the first ratio determining module is used for determining a first peak-to-average power ratio of the received signal according to a preset signal;
the frequency offset compensation module is used for performing frequency offset compensation on the received signal if the first peak-to-average power ratio is greater than a preset first threshold;
a second ratio determining module, configured to determine, according to the preset signal, a second peak-to-average power ratio of the received signal after the frequency offset compensation;
and the synchronous signal module is used for determining that the received signal is synchronous with the preset signal if the second peak-to-average power ratio is greater than a preset second threshold.
Further, the first ratio determining module further includes:
the down-sampling unit is used for down-sampling the received signal to obtain a low-sampling signal;
the first correlation value determining unit is used for performing correlation calculation on the preset signal and the low sampling signal to obtain a first correlation value of each point in the low sampling signal;
and the first ratio determining unit is used for obtaining a first peak-to-average power ratio of the received signal according to the average value of the first correlation value of the current point and the first correlation value of the point before the current point.
In a third aspect, an embodiment of the present invention provides a server, including a processor and a memory, where the memory stores machine executable instructions capable of being executed by the processor, and the processor executes the machine executable instructions to implement the method for synchronizing signals according to any one of the embodiments of the first aspect.
In a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium, on which a computer program is stored, where the computer program is executed by a processing device to perform the steps of the method for synchronizing signals according to any one of the embodiments of the first aspect.
The embodiment of the invention brings the following beneficial effects:
in the method, if a first peak-to-average power ratio of a received signal determined by a preset signal is greater than a preset first threshold, performing frequency offset compensation on the received signal; if the second peak-to-average power ratio of the frequency offset compensated received signal determined by the preset signal is greater than the preset second threshold, it may be determined that the received signal is synchronized with the preset signal. In the method, a double-threshold value is set for the determined average power ratio of the first peak value to the second peak value, signal synchronization is preliminarily determined through the first preset threshold value, then signal synchronization is finally determined through the second preset threshold value, the initial signal synchronization capability of the terminal can be improved under the conditions of large Doppler frequency and low signal-to-noise ratio of the received signals, and the success rate of capturing the initial synchronization signals is further improved.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a flowchart of a method for synchronizing signals according to an embodiment of the present invention;
fig. 2 is a flowchart of a method for determining a first peak-to-average power ratio according to an embodiment of the present invention;
FIG. 3 is a flowchart of a second method for determining a peak-to-average power ratio according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of an apparatus for synchronizing signals according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a server according to an embodiment of the present invention.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the related art, aiming at a traditional ground mobile communication system, a direct cross-correlation or a segmented cross-correlation algorithm is usually adopted to capture an initial synchronization signal; however, the low-orbit satellite broadband mobile communication system has the problems of large doppler frequency offset and low signal-to-noise ratio, and under such a condition, a synchronization signal acquisition method of the traditional ground mobile communication system, such as a direct cross-correlation or a segmented cross-correlation algorithm, is still adopted, and under such a severe environment, the result performance is poor, and the success rate of acquiring the initial synchronization signal is low. Based on this, the method, the device and the server for synchronizing the signals provided by the embodiments of the present invention can improve the initial synchronization capability of the terminal under the conditions of large doppler frequency offset and low signal-to-noise ratio of the received signals, thereby improving the success rate of capturing the initial synchronization signals.
For the convenience of understanding the present embodiment, a method for synchronizing signals disclosed in the embodiments of the present invention will be described in detail first.
The first embodiment is as follows:
the present embodiment provides a method for synchronizing signals, as shown in fig. 1, the method includes the following steps:
step S102, determining a first peak-to-average power ratio of a received signal according to a preset signal;
the preset signal may be a local signal generated by a system terminal, and in order to synchronize the received signal with the local signal, the preset signal and the received signal may be first subjected to correlation analysis, and a result of the correlation analysis of the received signal may be calculated to obtain a first peak-to-average power ratio. The received signal may be a continuous signal sent by a mobile communication system, wherein the mobile communication system may be a low-orbit satellite broadband mobile communication system, a conventional terrestrial mobile communication system, or the like. The peak-to-average power ratio generally refers to a ratio of peak power to average power, and in this embodiment, may refer to a ratio of peak power to average power of each signal point of the received signal, or may refer to a ratio of peak power to average power of each point in a correlation analysis result of the received signal.
Step S104, if the first peak average power ratio is larger than a preset first threshold value, performing frequency offset compensation on the received signal;
the preset first threshold is generally set according to the preset signal and the received signal, and for the same terminal, because the preset signal and the received signal are relatively stable, the size of the threshold is also relatively fixed, and the size of the first threshold can be set to be one. When the first peak-to-average power ratio at a certain point in the received signal is greater than the preset first threshold, it can be considered that the received signal has completed preliminary signal synchronization with the preset signal from the point, and the synchronization result generally indicates rough signal synchronization. Since the received signal usually generates severe frequency selective fading and frequency offset in high-speed data transmission in a wireless environment, frequency offset compensation needs to be performed on the received signal to complete accurate signal synchronization. The method of frequency offset compensation firstly performs frequency offset estimation on the received signal, and performs frequency offset compensation according to the estimated frequency offset.
Step S106, determining a second peak-to-average power ratio of the received signal after frequency offset compensation according to a preset signal;
the signal after the frequency offset compensation is synchronized more accurately relative to the initial received signal. Similarly, the preset signal and the received signal after the frequency offset compensation may be subjected to correlation analysis, and a ratio of the peak power to the average power of each point in the correlation analysis result of the received signal is calculated to obtain a second peak-to-average power ratio.
Step S108, if the second peak-to-average power ratio is greater than a preset second threshold, it is determined that the received signal is synchronized with the preset signal.
The preset second threshold may be determined according to an attribute of the received signal, such as a frequency offset value, a first peak-to-average power ratio, a signal-to-noise ratio, and the like of the received signal. When the second peak-to-average power ratio of a certain point in the received signal is greater than the preset second threshold, it is stated that from this point, it can be determined that the received signal is synchronized with the preset signal, which indicates that the terminal successfully accesses the network by initializing the synchronization signal.
In the method for synchronizing signals provided by the embodiment of the invention, if a first peak-to-average power ratio of a received signal determined by a preset signal is greater than a preset first threshold, frequency offset compensation is performed on the received signal; if the second peak-to-average power ratio of the frequency offset compensated received signal determined by the preset signal is greater than the preset second threshold, it may be determined that the received signal is synchronized with the preset signal. In the method, a double-threshold value is set for the determined average power ratio of the first peak value to the second peak value, signal synchronization is preliminarily determined through the first preset threshold value, and signal synchronization is finally determined through the second preset threshold value, so that the initial signal synchronization capability of the terminal can be improved under the conditions of large Doppler frequency offset and low signal-to-noise ratio of the received signals, and the success rate of capturing the initial synchronization signals is further improved.
Further, referring to the flowchart of the method for determining the first peak-to-average power ratio shown in fig. 2, the preset signal includes a low sampling rate preset signal. A specific implementation procedure for determining a first peak-to-average power ratio of a received signal according to a preset signal, as shown in fig. 2, includes the following steps:
step S202, down-sampling the received signal to obtain a low-sampling signal;
because the signal received by the system is a high-sampling received signal, in order to reduce the calculation amount, the received signal can be down-sampled in the process of primary signal synchronization to obtain a low-sampling signal, so that the subsequent correlation calculation of the received signal is facilitated.
Step S204, performing correlation calculation on the low-sampling preset signal and the low-sampling signal to obtain a first correlation value of each point in the low-sampling signal;
the correlation calculation may be a piecewise cross-correlation algorithm calculation, for example, the low-sampling preset signal includes 100 points, the low-sampling signal is a signal that is continuously received, every other point of the low-sampling signal is segmented, each segment includes 100 points, and as the signal is continuously received, the low-sampling preset signal is respectively cross-correlated with each segmented signal to obtain a correlation value, and the correlation value corresponds to a first point in the segmented signal, so that a first correlation value of each point in the low-sampling signal can be obtained.
Step S206, a first peak-to-average power ratio of the low-sampling signal is obtained according to an average value of the first correlation value of the current point and the first correlation value of a point before the current point.
Since the received signal is a continuous reception process, there are usually several points before the current point, so the first peak-to-average power ratio of each point can be directly calculated. The current point is a point included in the received signal during the continuous reception, and as the received signal is continuously received, the average value of the first correlation values of the points before the current point also continuously changes as the signal is received. The upper first peak-to-average power ratio may be a ratio of a first correlation value of the current point and an average of first correlation values of points previous to the current point.
For example, the current point is a second point of the received signal, and the first peak-to-average power ratio of the point may be a ratio of the first correlation value of the point to the first correlation value of the first point; then calculating a first peak-to-average power ratio of a third point of the received signal, a first correlation value of the third point, and a ratio of an average value of the first correlation values of the first point and the second point; the first peak to average power ratio for each point is continuously calculated as the signal is received.
In the method, the correlation calculation is performed by utilizing the low-sampling preset signal and the low-sampling receiving signal, so that compared with the method of directly performing the correlation calculation on the receiving signal, the calculation resource is saved, and a certain calculation amount is reduced.
Further, the step of performing frequency offset compensation on the received signal includes: carrying out frequency offset estimation on a low-sampling signal corresponding to a received signal to obtain a frequency offset value; and performing frequency offset compensation on the received signal according to the frequency offset value.
In order to reduce the calculation amount, firstly, a frequency offset rough estimation algorithm is utilized to carry out frequency offset rough estimation on a low-sampling signal of a received signal, and a frequency offset value of the signal can be obtained; in order to make the received signal more accurate, the frequency offset compensation can be performed on the received high sampling rate signal according to the obtained frequency offset value.
Further, the method further comprises: determining the signal-to-noise ratio of the received signal according to the first peak average power ratio and the frequency offset value; and determining a second threshold value according to the signal-to-noise ratio.
The frequency deviation usually causes signal-to-noise ratio loss to the signal, so that table lookup can be performed to estimate the signal-to-noise ratio of the received signal by using a standard prefabricated PAPR, frequency offset value and signal-to-noise ratio corresponding table through the calculated average power ratio to the first peak value and frequency offset value; the second threshold value may also be adjusted by table lookup according to a signal-to-noise ratio of the received signal by presetting the signal-to-noise ratio and the threshold value using a standard, and generally, the larger the signal-to-noise ratio is, the larger the adjustment of the second threshold value will be.
Further, referring to the flowchart of the second method for determining the peak-to-average power ratio shown in fig. 3, the preset signal includes a high-sampling-rate preset signal. According to the preset signal, a specific implementation process of determining the second peak-to-average power ratio of the received signal after frequency offset compensation is determined, as shown in fig. 3, the method includes the following steps:
step S302, performing correlation calculation on the high sampling rate preset signal and the received signal after frequency offset compensation to obtain a second correlation value of each point in the received signal after frequency offset compensation;
the received signal after the frequency offset compensation is a high sampling rate signal, the correlation calculation can be a direct cross-correlation algorithm, a sliding window is set for the received signal after the frequency offset compensation, and a second correlation value of each point in the sliding window can be calculated; the high sampling rate preset signal and the high sampling rate receiving signal are used for correlation calculation, and the synchronization accuracy can be increased.
Step S304, according to the average value of the second correlation value of the current point and the second correlation value of the point before the current point, the second peak average power ratio of the receiving signal after the frequency offset compensation is obtained.
The specific calculation method of the second peak-to-average power ratio is the same as the calculation method of the first peak-to-average power ratio in step S206, and for a brief description, reference may be made to the relevant content in step S206, which is not repeated herein.
Furthermore, the number of the preset signals is multiple, and each preset signal carries a signal identifier; the step of determining synchronization of the received signal and the preset signal includes: acquiring a signal identifier carried by each preset signal; and determining the synchronous position of the received signal according to the fact that each preset signal carries a signal identifier.
The number of the preset signals may be three, and the signal point of each preset signal is subjected to correlation calculation with the signal point of the received signal, so that the obtained peak-to-average power ratio may also carry an identifier corresponding to the signal identifier carried in the preset signal. When the received signals and the preset signals are finally determined to be synchronous, the carried identification in the second peak average power ratio larger than the preset second threshold value is extracted, meanwhile, the identification carried by each preset signal is obtained, the initial synchronous position of the received signals can be determined by comparing the identification of the second peak average power ratio, and further, the success of signal synchronization is determined.
Example two:
corresponding to the above method embodiment, an embodiment of the present invention provides an apparatus for synchronizing signals, as shown in fig. 4, the apparatus includes:
a first ratio determining module 41, configured to determine a first peak-to-average power ratio of the received signal according to a preset signal;
a frequency offset compensation module 42, configured to perform frequency offset compensation on the received signal if the first peak-to-average power ratio is greater than a preset first threshold;
a second ratio determining module 43, configured to determine, according to the preset signal, a second peak-to-average power ratio of the received signal after the frequency offset compensation;
a synchronization signal module 44, configured to determine that the received signal is synchronized with the preset signal if the second peak-to-average power ratio is greater than a preset second threshold.
Further, the preset signal includes a low sampling rate preset signal; the first ratio determining module further includes: the down-sampling unit is used for down-sampling the received signal to obtain a low-sampling signal; the first correlation value determining unit is used for carrying out correlation calculation on the low sampling rate preset signal and the low sampling signal to obtain a first correlation value of each point in the low sampling signal; and the first ratio determining unit is used for obtaining the first peak-to-average power ratio of the low-sampling-rate signal according to the average value of the first correlation value of the current point and the first correlation value of the point before the current point.
Further, the frequency offset compensation module is further configured to perform frequency offset estimation on a low-sampling signal corresponding to the received signal to obtain a frequency offset value; and performing frequency offset compensation on the received signal according to the frequency offset value.
Further, the above apparatus is further configured to: determining the signal-to-noise ratio of the received signal according to the first peak average power ratio and the frequency offset value; and determining a second threshold value according to the signal-to-noise ratio.
Further, the preset signal includes a high sampling rate preset signal; the second ratio determining module is further configured to: performing correlation calculation on the high-sampling-rate preset signal and the received signal subjected to frequency offset compensation to obtain a second correlation value of each point in the received signal subjected to frequency offset compensation; and aiming at the second correlation values of all points except the first point, obtaining a second peak-to-average power ratio of the received signal after frequency offset compensation according to the average value of the second correlation value of the current point and the second correlation value of the point before the current point.
Furthermore, the number of the preset signals is multiple, and each preset signal carries a signal identifier;
further, the synchronization signal module is further configured to: acquiring a signal identifier carried by each preset signal; and determining the synchronous position of the received signal according to the signal identifier carried by each preset signal.
In the apparatus for synchronizing signals according to the embodiments of the present invention, if a first peak-to-average power ratio of a received signal determined by a preset signal is greater than a preset first threshold, frequency offset compensation is performed on the received signal; if the second peak-to-average power ratio of the frequency offset compensated received signal determined by the preset signal is greater than the preset second threshold, it may be determined that the received signal is synchronized with the preset signal. In the method, a double-threshold value is set for the determined average power ratio of the first peak value to the second peak value, signal synchronization is preliminarily determined through the first preset threshold value, then signal synchronization is finally determined through the second preset threshold value, the initial signal synchronization capability of the terminal can be improved under the conditions of large Doppler frequency and low signal-to-noise ratio of the received signals, and the success rate of capturing the initial synchronization signals is further improved.
The implementation principle and the technical effect of the apparatus for synchronizing signals provided by the embodiments of the present invention are the same as those of the method embodiments of synchronizing signals described above, and for the sake of brief description, reference may be made to the corresponding contents in the method embodiments of synchronizing signals described above for the portions of the embodiments of synchronizing signals that are not mentioned.
An embodiment of the present invention further provides a server, as shown in fig. 5, which includes a processor and a memory, where the memory stores machine executable instructions capable of being executed by the processor, and the processor executes the machine executable instructions to implement the method for synchronizing signals.
Further, the server shown in fig. 5 further includes a bus 132 and a communication interface 133, and the processor 130, the communication interface 133 and the memory 131 are connected through the bus 132.
The Memory 131 may include a high-speed Random Access Memory (RAM) and may also include a non-volatile Memory (non-volatile Memory), such as at least one disk Memory. The communication connection between the network element of the system and at least one other network element is realized through at least one communication interface 133 (which may be wired or wireless), and the internet, a wide area network, a local network, a metropolitan area network, and the like can be used. Bus 132 may be an ISA bus, PCI bus, EISA bus, or the like. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, only one double-headed arrow is shown in FIG. 5, but this does not indicate only one bus or one type of bus.
The processor 130 may be an integrated circuit chip having signal processing capabilities. In implementation, the steps of the above method may be performed by instructions in the form of hardware integrated logic circuits or software in the processor 130. The Processor 130 may be a general-purpose Processor, and includes a Central Processing Unit (CPU), a Network Processor (NP), and the like; the device can also be a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field-Programmable Gate Array (FPGA), or other Programmable logic devices, discrete Gate or transistor logic devices, discrete hardware components. The various methods, steps and logic blocks disclosed in the embodiments of the present invention may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of the method disclosed in connection with the embodiments of the present invention may be directly implemented by a hardware decoding processor, or implemented by a combination of hardware and software modules in the decoding processor. The software module may be located in ram, flash memory, rom, prom, or eprom, registers, etc. storage media as is well known in the art. The storage medium is located in the memory 131, and the processor 130 reads the information in the memory 131, and completes the steps of the method of the foregoing embodiment in combination with the hardware thereof.
The embodiment of the present invention further provides a machine-readable storage medium, where the machine-readable storage medium stores machine-executable instructions, and when the machine-executable instructions are called and executed by a processor, the machine-executable instructions cause the processor to implement the method for synchronizing signals.
The computer program product of the method, the apparatus, and the system for synchronizing signals provided in the embodiments of the present invention includes a computer readable storage medium storing a program code, where instructions included in the program code may be used to execute the method described in the foregoing method embodiments, and specific implementation may refer to the method embodiments, and will not be described herein again.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the system and the apparatus described above may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In addition, in the description of the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases for those skilled in the art.
The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention or a part thereof which substantially contributes to the prior art may be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that the following embodiments are merely illustrative of the present invention, and not restrictive, and the scope of the present invention is not limited thereto: those skilled in the art can still make modifications or changes to the embodiments described in the foregoing embodiments, or make equivalent substitutions for some features, within the scope of the disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the embodiments of the present invention, and they should be construed as being included therein. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (8)
1. A method of synchronizing signals, the method comprising:
determining a first peak-to-average power ratio of a received signal according to a preset signal;
if the first peak value average power ratio is larger than a preset first threshold value, carrying out frequency offset compensation on the received signal; performing preliminary signal synchronization with the preset signal from a received signal corresponding to the first peak-to-average power ratio larger than the first threshold; performing frequency offset compensation on the received signal which is subjected to preliminary signal synchronization with the preset signal;
determining a second peak-to-average power ratio of the received signal after frequency offset compensation according to the preset signal;
if the second peak-to-average power ratio is greater than a preset second threshold, determining that the received signal is synchronous with the preset signal;
the preset signal comprises a low sampling rate preset signal; the step of determining a first peak-to-average power ratio of the received signal based on a predetermined signal comprises:
down-sampling the received signal to obtain a low-sampling signal;
performing correlation calculation on the low sampling rate preset signal and the low sampling signal to obtain a first correlation value of each point in the low sampling signal;
and obtaining a first peak-to-average power ratio of the low-sampling signal according to the average value of the first correlation value of the current point and the first correlation value of the point before the current point.
2. The method of claim 1, wherein the step of compensating for the frequency offset of the received signal comprises:
performing frequency offset estimation on a low-sampling signal corresponding to the received signal to obtain a frequency offset value;
and performing frequency offset compensation on the received signal according to the frequency offset value.
3. The method of claim 2, further comprising:
determining the signal-to-noise ratio of the received signal according to the first peak-to-average power ratio and the frequency offset value;
and determining the second threshold value according to the signal-to-noise ratio.
4. The method of claim 3, wherein the preset signal comprises a high sample rate preset signal;
determining a second peak-to-average power ratio of the received signal after frequency offset compensation according to the preset signal, including:
performing correlation calculation on the high-sampling-rate preset signal and the received signal after frequency offset compensation to obtain a second correlation value of each point in the received signal after frequency offset compensation;
and obtaining a second peak-to-average power ratio of the received signal after frequency offset compensation according to the average value of the second correlation value of the current point and the second correlation value of the point before the current point.
5. The method according to claim 1, wherein the predetermined signal is plural, and each predetermined signal carries a signal identifier;
the step of determining that the received signal and the preset signal are synchronized comprises:
acquiring a signal identifier carried by each preset signal;
and determining the synchronous position of the received signal according to the signal identifier carried by each preset signal.
6. An apparatus for synchronizing signals, the apparatus comprising:
the first ratio determining module is used for determining a first peak-to-average power ratio of the received signal according to a preset signal;
the frequency offset compensation module is used for performing frequency offset compensation on the received signal if the first peak-to-average power ratio is greater than a preset first threshold; performing preliminary signal synchronization with the preset signal from a received signal corresponding to the first peak-to-average power ratio larger than the first threshold; performing frequency offset compensation on the received signal which is subjected to preliminary signal synchronization with the preset signal;
a second ratio determining module, configured to determine, according to the preset signal, a second peak-to-average power ratio of the received signal after the frequency offset compensation;
a synchronization signal module, configured to determine that the received signal is synchronized with the preset signal if the second peak-to-average power ratio is greater than a preset second threshold;
the first ratio determination module further comprises:
the down-sampling unit is used for down-sampling the received signal to obtain a low-sampling signal;
the first correlation value determining unit is used for performing correlation calculation on the preset signal and the low-sampling signal to obtain a first correlation value of each point in the low-sampling signal;
and the first ratio determining unit is used for obtaining a first peak-to-average power ratio of the received signal according to the average value of the first correlation value of the current point and the first correlation value of the point before the current point.
7. A server comprising a processor and a memory, the memory storing machine executable instructions executable by the processor, the processor executing the machine executable instructions to implement the method of synchronizing signals of any one of claims 1 to 5.
8. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processing device, carries out the steps of the method of synchronizing signals according to any one of claims 1 to 5.
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