CN112003645B - Synchronous reference signal extraction method and device - Google Patents

Synchronous reference signal extraction method and device Download PDF

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CN112003645B
CN112003645B CN202011179350.0A CN202011179350A CN112003645B CN 112003645 B CN112003645 B CN 112003645B CN 202011179350 A CN202011179350 A CN 202011179350A CN 112003645 B CN112003645 B CN 112003645B
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branch data
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CN112003645A (en
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王玉皞
周辉林
陈铭均
王正海
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Nanchang University
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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
    • H04B7/19—Earth-synchronous stations
    • 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
    • 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
    • H04L27/2689—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation
    • H04L27/2695—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation with channel estimation, e.g. determination of delay spread, derivative or peak tracking

Abstract

A method and a device for extracting a synchronous reference signal are provided, the method comprises the following steps: generating a local synchronization signal; performing branch processing on the local synchronous signal by using a self-adaptive synthesis module to obtain a plurality of branch data, and performing synthesis processing on each branch data, wherein the synthesis processing is to perform product calculation on the current branch data and a synthesis coefficient corresponding to each branch data respectively and then sum the current branch data and the synthesis coefficient; determining a value of a synthesis coefficient when a mean square error of the branch data and the received signal after the synthesis processing is minimum; and processing the received signal according to the value of the synthesis coefficient to generate a synchronous reference signal corresponding to the received signal. The embodiment utilizes the known synchronous signals and the received signals of the synchronous segments to adaptively calculate the synthesis coefficient, and can adaptively extract high-quality reference signals from weak communication irradiation and scattering signals with complex structures and various signal parameters.

Description

Synchronous reference signal extraction method and device
Technical Field
The present invention relates to the field of information transmission technologies, and in particular, to a method and an apparatus for extracting a synchronization reference signal.
Background
In various military and civil distributed wireless information systems such as an air-space-ground integrated heterogeneous network, a tactical information network, an internet of things, a broadband wireless communication network, a satellite communication network, an observation and monitoring information network, a vehicle networking network and the like, in the working process of the system, wireless communication is a radio frequency sensor which needs to work, and the system can send out data communication signals. In the whole distributed wireless information system layer, data communication signals are transmitted more, the transmitting time of the signals is randomly occupied by each node, and all the nodes are traversed randomly according to a certain statistical period length. In the airspace, because the transmitter of the distributed wireless information system can randomly traverse all the nodes, in the process, the irradiation signal and the scattering signal of data communication can irradiate the target from different angles in all directions. During the irradiation, the target scatters and modulates the signal, and the modulated information carries important target-related information.
As shown in fig. 4, during the communication between the ground station a and the drone D, the direct illumination signal from the ground station a may be overlaid on the airplanes B, C and D, while the illumination signal from the ground station a may be scattered by the airplanes B and C, and the scattered signal may be illuminated on the airplane D, during which the airplane D may detect the object in the air and measure its parameters using the illumination signal and the scattered signal from the ground station a during the communication.
In order to detect the target in the air and measure the parameters thereof, as shown in the above figure, firstly, a reference signal needs to be extracted, and a series of processing (including time-frequency two-dimensional processing, clutter suppression and the like) is adopted to highlight the signal parameter change of the received signal compared with the reference signal; further adopting measures such as constant false alarm detection and the like to detect the change; then, the variation of the parameter is measured; and finally, combining the state of the system on the basis of measuring the target parameters to finish the track tracking of the target.
In the above processing process, the key step is to extract the reference signal, and in the conventional reference signal extraction, synchronization, demodulation, decoding and verification are required to be performed on the target received signal, and after the verification is successful, the operations of encoding, modulating, framing and the like are performed on the acquired message in reverse direction, so that the reference signal is restored. The traditional treatment method has the following weaknesses: firstly, accurately restoring a message transmitted by a transmitting terminal; secondly, the restored reference signal is completely a reference signal locally reproduced by the airplane D, and cannot represent modulation information of a propagation environment, so that target modulation information and propagation environment modulation information are blurred, and the target parameter measurement performance is deteriorated; and thirdly, in the nodes of non-communication objects, the reference signals cannot be restored, so that target detection and parameter measurement cannot be carried out.
Disclosure of Invention
In view of the above, it is necessary to provide a method and an apparatus for extracting a synchronization reference signal to solve the problem in the prior art that the reference signal cannot be accurately extracted in the communication process.
A synchronization reference signal extraction method, comprising:
generating a local synchronizing signal according to a pre-stored generator polynomial and parameters, or circularly reading out a pre-stored random signal according to a sequence to generate a local synchronizing signal;
performing branch processing on the local synchronous signal by using a self-adaptive synthesis module to obtain a plurality of branch data, and performing synthesis processing on each branch data, wherein the synthesis processing is to perform product calculation on the current branch data and a synthesis coefficient corresponding to each branch data respectively and then sum the current branch data and the synthesis coefficient;
determining a value of a synthesis coefficient when a mean square error of the branch data and the received signal after the synthesis processing is minimum;
processing the received signal according to the value of the synthesis coefficient to generate a synchronous reference signal corresponding to the received signal;
the adaptive synthesis module comprises a plurality of branch modules, each branch module comprises a delay unit and a synthesis unit which are connected in series, the delay unit is used for carrying out delay processing on the local synchronous signal to generate a plurality of branch data, the synthesis unit comprises a multiplier and a synthesis coefficient memory, the multiplier is used for carrying out synthesis processing on each branch data, and the synthesis coefficient memory is used for storing synthesis coefficients.
Further, in the above method for extracting a synchronization reference signal, the step of determining a value of a synthesis coefficient at which a mean square error between the branch data and the received signal after the synthesis processing is minimum includes:
the step of determining a value of a synthesis coefficient at which a mean square error between the branch data after the synthesis processing and the received signal is minimum includes:
establishing a minimum mean square error equation of the branch data and the received signal after the synthesis processing:
Figure 66261DEST_PATH_IMAGE001
；
wherein the content of the first and second substances,
Figure 334431DEST_PATH_IMAGE002
，
Figure 388975DEST_PATH_IMAGE003
is shown as
Figure 352908DEST_PATH_IMAGE004
Number of bit branchesAccording to the above-mentioned technical scheme,
Figure 860112DEST_PATH_IMAGE005
，
Figure 931973DEST_PATH_IMAGE006
which indicates the length of the synchronization signal,
Figure 106603DEST_PATH_IMAGE007
is shown as
Figure 972928DEST_PATH_IMAGE008
The synthesis coefficients of the individual branches, M representing the total number of branches,
Figure 967429DEST_PATH_IMAGE009
indicating received signals
Figure 577401DEST_PATH_IMAGE010
The number of bits is,
Figure 606537DEST_PATH_IMAGE011
2, expressing 2 norm operation;
and determining the value of the synthesis coefficient when the mean square error is minimum according to the error equation.
Further, in the above method for extracting a synchronization reference signal, a calculation formula of the synthesis coefficient is:
Figure 643763DEST_PATH_IMAGE012
；
wherein the content of the first and second substances,
Figure 391140DEST_PATH_IMAGE013
，
Figure 539224DEST_PATH_IMAGE014
，
Figure 422867DEST_PATH_IMAGE015
，
Figure 896573DEST_PATH_IMAGE016
representing a circular downshifting of a column vector
Figure 865666DEST_PATH_IMAGE017
The number of bits is,
Figure 83021DEST_PATH_IMAGE018
representing the conjugate transpose of a matrix or vector,
Figure 821170DEST_PATH_IMAGE019
。
further, in the above method for extracting synchronization reference signal, the synchronization reference signalrefThe calculation formula of (2) is as follows:
Figure 200199DEST_PATH_IMAGE020
；
wherein the content of the first and second substances,
Figure 671236DEST_PATH_IMAGE021
，
Figure 426702DEST_PATH_IMAGE022
，
Figure 284937DEST_PATH_IMAGE023
，
Figure 100446DEST_PATH_IMAGE024
which represents a non-negative integer that is,
Figure 44132DEST_PATH_IMAGE025
to
Figure 337710DEST_PATH_IMAGE026
Denotes the synthesis coefficient of each branch, M denotes the total number of branches,
Figure 50451DEST_PATH_IMAGE027
representing the received signal.
The embodiment of the present invention further provides a device for extracting a synchronization reference signal, including:
the synchronous signal module is used for generating a local synchronous signal according to a pre-stored generator polynomial and parameters or circularly reading out a pre-stored random signal according to a sequence to generate a local synchronous signal;
the self-adaptive synthesis module is used for performing branch processing on the local synchronous signal to obtain a plurality of branch data and performing synthesis processing on each branch data, wherein the synthesis processing is to perform product calculation on the current branch data and a synthesis coefficient corresponding to each branch data and then sum the current branch data and the synthesis coefficient;
the synthesis coefficient resolving module is used for determining the value of the synthesis coefficient when the mean square error of the branch data and the received signal after the synthesis processing is minimum;
a reference signal generating module, configured to process the received signal according to the value of the synthesis coefficient to generate a synchronous reference signal corresponding to the received signal;
the adaptive synthesis module comprises a plurality of branch modules, each branch module comprises a delay unit and a synthesis unit which are connected in series, the delay unit is used for carrying out delay processing on the local synchronous signal to generate a plurality of branch data, the synthesis unit comprises a multiplier and a synthesis coefficient memory, the multiplier is used for carrying out synthesis processing on each branch data, and the synthesis coefficient memory is used for storing synthesis coefficients.
The method utilizes the known synchronous signals and the received signals of the synchronous section to calculate the synthesis coefficient in a self-adaptive manner, can extract high-quality reference signals from weak communication irradiation and scattering signals with complex structures and various signal parameters in a self-adaptive manner, provides the high-quality reference signals for coherent passive detection, coherent active detection and coherent external source detection, improves the detection capability and target parameter measurement capability of low signal-to-noise ratio signals, improves the detection efficiency of targets, and can realize airborne, shipborne, spaceborne and foundation concealed target detection, monitoring and early warning. Meanwhile, the hidden situation perception capability of the wireless information system is obviously improved, the defects of the capabilities of airborne, shipborne, spaceborne, foundation active detection, passive detection and external source detection are overcome, and the method has wide military and civil application prospects.
Drawings
Fig. 1 is a flowchart of a synchronization reference signal extraction method according to a first embodiment of the present invention;
FIG. 2 is a flowchart illustrating the adaptive synthesis module performing branch processing on the local synchronization signal according to the first embodiment of the present invention;
FIG. 3 is a block diagram of a synchronization reference signal extraction apparatus according to a first embodiment of the present invention;
fig. 4 is a process example of a conventional communication.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
These and other aspects of embodiments of the invention will be apparent with reference to the following description and attached drawings. In the description and drawings, particular embodiments of the invention have been disclosed in detail as being indicative of some of the ways in which the principles of the embodiments of the invention may be practiced, but it is understood that the scope of the embodiments of the invention is not limited correspondingly. On the contrary, the embodiments of the invention include all changes, modifications and equivalents coming within the spirit and terms of the claims appended hereto.
Referring to fig. 1, a method for extracting a synchronization reference signal according to a first embodiment of the present invention includes steps S11-S14.
In step S11, a local synchronization signal is generated.
In a communication system, a typical one-frame communication transmission signal contains a synchronization segment, a control segment, a payload segment, and a protection segment. At the transmitting end, the synchronizing signal is known to all devices in the whole network and is used for synchronizing information such as sampling time, carrier waves and the like of each receiving device, the control section and the payload section are generated by controlling random messages to be transmitted and transmitting parameters of the transmitting end, and the two sections of signals are random for the receiving end.
The local synchronization signal is generated in the coarse synchronization segment according to a pre-stored generator polynomial and a pre-stored parameter, for example: g =1+ X2+X3+X6+X8+X9+X10The register initial value is 0, and a synchronization signal is generated. Or a synchronization signal may also be generated by cyclically reading out a pre-stored random signal in order. The synchronization signal is: x is the number of0，x1，…，xn-1。
Step S12, using an adaptive synthesis module to perform branch processing on the local synchronization signal to obtain multiple branch data, and performing synthesis processing on each branch data, where the synthesis processing is to perform product calculation on current branch data and a synthesis coefficient corresponding to each branch data, and then sum the current branch data and the synthesis coefficient.
Step S13 is to determine a value of a combining coefficient at which a mean square error between the branch data and the received signal after the combining process is minimum.
Specifically, the adaptive synthesis module comprises a plurality of branch modules, each branch module comprises a delay unit and a synthesis unit which are connected in series, the delay unit is used for carrying out delay processing on local synchronization to generate a plurality of branch data, each synthesis unit comprises a multiplier and a synthesis coefficient memory, the multiplier is used for carrying out synthesis processing on each branch data, the synthesis coefficient memory is used for storing synthesis coefficients, and each synthesis coefficient memory is used for storing a synthesis coefficient.
Wherein the number of branching modulesMThe maximum time ambiguity range and the sampling interval time of the system are determined, specifically,
Figure 36861DEST_PATH_IMAGE028
，
Figure 467843DEST_PATH_IMAGE029
representing the maximum time-ambiguity range of the system,
Figure 565112DEST_PATH_IMAGE030
which represents the time interval of sampling of the system,
Figure 132359DEST_PATH_IMAGE031
indicating a ceiling operation. The
Figure 24092DEST_PATH_IMAGE032
The delay amounts of the delay units of the parallel branch modules are respectively
Figure 207949DEST_PATH_IMAGE033
. As shown in FIG. 2, each register is initialized with zeros, and each bit data of each sync signal is input to
Figure 843329DEST_PATH_IMAGE034
The parallel branch modules obtain M branch data after data delay post-processing, and the M branch data of each synchronous signal are respectively multiplied by each synthesis coefficient and summed to obtain
Figure 530662DEST_PATH_IMAGE035
：
Figure 858876DEST_PATH_IMAGE036
（1）；
Wherein the content of the first and second substances,
Figure 733291DEST_PATH_IMAGE037
represents the second of the synchronization signal
Figure 706450DEST_PATH_IMAGE038
The number of the branches is one,
Figure 982711DEST_PATH_IMAGE039
，
Figure 481825DEST_PATH_IMAGE040
which indicates the length of the synchronization signal,
Figure 109116DEST_PATH_IMAGE041
is shown as
Figure 86299DEST_PATH_IMAGE042
The synthesis coefficient of each branch, M represents the total number of branches.
The synthesis coefficient of the above formula (1)
Figure 748225DEST_PATH_IMAGE043
Is an unknown number, the specific value of which is according to
Figure 152661DEST_PATH_IMAGE044
And the mean square error of the received signal. Specifically, the synthesis coefficient satisfying the minimum mean square error is calculated so that the above
Figure 267248DEST_PATH_IMAGE045
Mean square error of result of multiplying subsynchronous signal data bit and synthesis coefficient and buffer
Figure 48122DEST_PATH_IMAGE046
And minimum. The minimum mean square error equation of the branch data and the received signal after the synthesis processing is as follows:
Figure 564554DEST_PATH_IMAGE047
（2）；
wherein the content of the first and second substances,
Figure 405471DEST_PATH_IMAGE048
indicating received signals
Figure 7354DEST_PATH_IMAGE049
The number of bits is,
Figure 591919DEST_PATH_IMAGE050
representing a 2-norm operation.
Further, the value of one of the synthesis coefficients satisfying the above equation may be calculated according to the following calculation formula:
Figure 962857DEST_PATH_IMAGE051
（3）；
wherein the content of the first and second substances,
Figure 709096DEST_PATH_IMAGE052
，
Figure 532696DEST_PATH_IMAGE053
，
Figure 655373DEST_PATH_IMAGE054
，
Figure 883747DEST_PATH_IMAGE055
representing a circular downshifting of a column vector
Figure 66467DEST_PATH_IMAGE056
The number of bits is,
Figure 642942DEST_PATH_IMAGE057
representing the conjugate transpose of a matrix or vector,
Figure 569309DEST_PATH_IMAGE058
。
step S14, processing the received signal according to the value of the synthesis coefficient to generate a synchronization reference signal corresponding to the received signal.
According to the synthesis coefficient
Figure 649261DEST_PATH_IMAGE059
And obtaining a reference signal ref corresponding to the received signal, wherein the calculation formula is as follows:
Figure 268461DEST_PATH_IMAGE060
；
wherein the content of the first and second substances,
Figure 66653DEST_PATH_IMAGE061
，
Figure 265553DEST_PATH_IMAGE062
，
Figure 731169DEST_PATH_IMAGE063
r represents the following
Figure 521271DEST_PATH_IMAGE065
To the first
Figure 541179DEST_PATH_IMAGE067
A vector of received signal sample values,
Figure 809350DEST_PATH_IMAGE068
which represents a non-negative integer that is,
Figure 863893DEST_PATH_IMAGE025
to
Figure 559317DEST_PATH_IMAGE026
Denotes the synthesis coefficient of each branch, M denotes the total number of branches,
Figure 332101DEST_PATH_IMAGE027
representing the received signal.
In the frame structure of the communication signal, only the signal of the synchronization segment is known, the embodiment utilizes the known synchronization signal and the actual received signal of the synchronization segment to adaptively calculate the synthesis coefficient, and can adaptively extract the high-quality reference signal from the weak, complex-structure and diverse-signal-parameter communication irradiation and scattering signals, and all segments contained in the corresponding communication signal, such as the synchronization segment and the payload segment, provide the high-quality reference signal for coherent passive detection, coherent active detection and coherent external source detection, so that the detection system is favorable for utilizing the communication signals of all segments to accumulate energy, improve the detection capability of the low signal-to-noise ratio signal and the target parameter measurement capability, improve the detection efficiency of the target, and can realize airborne, naval, satellite-borne and foundation-concealed target detection, monitoring and early warning. Meanwhile, the hidden situation perception capability of the wireless information system is obviously improved, the defects of the capabilities of airborne, shipborne, spaceborne, foundation active detection, passive detection and external source detection are overcome, and the method has wide military and civil application prospects.
Referring to fig. 3, a synchronization reference signal extracting apparatus according to a second embodiment of the present invention includes:
a synchronizing signal module 10, configured to generate a local synchronizing signal according to a pre-stored generator polynomial and a parameter, or cyclically read out a pre-stored random signal in sequence to generate a local synchronizing signal;
the adaptive synthesis module 20 is configured to perform branch processing on the local synchronization signal to obtain a plurality of branch data, and perform synthesis processing on each branch data, where the synthesis processing is to perform product calculation on current branch data and a synthesis coefficient corresponding to each branch data, and then sum the current branch data and the synthesis coefficient;
a synthesis coefficient calculation module 30, configured to determine a value of a synthesis coefficient when a mean square error between the branch data and the received signal after the synthesis processing is minimum;
and the reference signal generating module 40 is configured to process the received signal according to the value of the synthesis coefficient to generate a synchronous reference signal corresponding to the received signal.
The synchronous reference signal extraction device comprises a synchronous signal module, a self-adaptive synthesis module, a synthesis coefficient resolving module and a reference signal generation module, wherein the synchronous signal module generates a local synchronous signal of a receiving node; the self-adaptive synthesis module is used for self-adaptively synthesizing the multi-path received signals; the synthesis coefficient resolving module resolves the synthesis coefficient based on the principle of minimum mean square error; the reference signal generation module generates a reference signal using the synthesis coefficients satisfying the minimum mean square error.
The logic and/or steps represented in the flowcharts or otherwise described herein, e.g., an ordered listing of executable instructions that can be considered to implement logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device.
More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.
It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (5)

1. A method for extracting a synchronization reference signal, comprising:
generating a local synchronizing signal according to a pre-stored generator polynomial and parameters, or circularly reading out a pre-stored random signal according to a sequence to generate a local synchronizing signal;
performing branch processing on the local synchronous signal by using a self-adaptive synthesis module to obtain a plurality of branch data, and performing synthesis processing on each branch data, wherein the synthesis processing is to perform product calculation on the current branch data and a synthesis coefficient corresponding to each branch data respectively and then sum the current branch data and the synthesis coefficient;
determining a value of a synthesis coefficient when a mean square error of the branch data and the received signal after the synthesis processing is minimum;
processing the received signal according to the value of the synthesis coefficient to generate a synchronous reference signal corresponding to the received signal;
the adaptive synthesis module comprises a plurality of branch modules, each branch module comprises a delay unit and a synthesis unit which are connected in series, the delay unit is used for carrying out delay processing on the local synchronous signal to generate a plurality of branch data, the synthesis unit comprises a multiplier and a synthesis coefficient memory, the multiplier is used for carrying out synthesis processing on each branch data, and the synthesis coefficient memory is used for storing synthesis coefficients.
2. The method of claim 1, wherein the step of determining the value of the combining coefficient at which the mean square error of the branch data after the combining process with the received signal is minimum comprises:
establishing a minimum mean square error equation of the branch data and the received signal after the synthesis processing:
Figure 33839DEST_PATH_IMAGE001
；
wherein the content of the first and second substances,
Figure 4069DEST_PATH_IMAGE002
，
Figure 545909DEST_PATH_IMAGE003
is shown as
Figure 45024DEST_PATH_IMAGE004
The bit of the branch data is taken out,
Figure 672314DEST_PATH_IMAGE005
，
Figure 180656DEST_PATH_IMAGE006
which indicates the length of the synchronization signal,
Figure 577002DEST_PATH_IMAGE007
is shown as
Figure 247018DEST_PATH_IMAGE008
The synthesis coefficients of the individual branches, M representing the total number of branches,
Figure 364534DEST_PATH_IMAGE009
indicating received signals
Figure 145408DEST_PATH_IMAGE010
The number of bits is,
Figure 661840DEST_PATH_IMAGE011
2, expressing 2 norm operation;
and determining the value of the synthesis coefficient when the mean square error is minimum according to the error equation.
3. The method of claim 2, wherein the minimum mean square error equation is calculated by the formula of the synthesis coefficient:
Figure 502757DEST_PATH_IMAGE012
；
wherein the content of the first and second substances,
Figure 104640DEST_PATH_IMAGE013
，
Figure 689205DEST_PATH_IMAGE014
，
Figure 60143DEST_PATH_IMAGE015
representing a circular downshifting of a column vector
Figure 71962DEST_PATH_IMAGE016
The number of bits is,
Figure 895561DEST_PATH_IMAGE017
representing the conjugate transpose of a matrix or vector,
Figure 283817DEST_PATH_IMAGE018
。
4. the method of claim 1, wherein the synchronous reference signal ref is calculated by the formula:
Figure 509262DEST_PATH_IMAGE019
；
wherein the content of the first and second substances,
Figure 691982DEST_PATH_IMAGE020
，
Figure 268457DEST_PATH_IMAGE021
，
Figure 460404DEST_PATH_IMAGE022
r represents the following
Figure 805934DEST_PATH_IMAGE023
To the first
Figure 416345DEST_PATH_IMAGE024
A vector of vector sample values formed from a plurality of received signals,
Figure 214537DEST_PATH_IMAGE025
which represents a non-negative integer that is,
Figure 944596DEST_PATH_IMAGE026
to
Figure 879054DEST_PATH_IMAGE027
Denotes the synthesis coefficient of each branch, M denotes the total number of branches,
Figure 669155DEST_PATH_IMAGE028
representing the received signal.
5. A synchronization reference signal extraction apparatus, comprising:
the synchronous signal module is used for generating a local synchronous signal according to a pre-stored generator polynomial and parameters or circularly reading out a pre-stored random signal according to a sequence to generate a local synchronous signal;
the self-adaptive synthesis module is used for performing branch processing on the local synchronous signal to obtain a plurality of branch data and performing synthesis processing on each branch data, wherein the synthesis processing is to perform product calculation on the current branch data and a synthesis coefficient corresponding to each branch data and then sum the current branch data and the synthesis coefficient;
the synthesis coefficient resolving module is used for determining the value of the synthesis coefficient when the mean square error of the branch data and the received signal after the synthesis processing is minimum;
a reference signal generating module, configured to process the received signal according to the value of the synthesis coefficient to generate a synchronous reference signal corresponding to the received signal;
the adaptive synthesis module comprises a plurality of branch modules, each branch module comprises a delay unit and a synthesis unit which are connected in series, the delay unit is used for carrying out delay processing on the local synchronous signal to generate a plurality of branch data, the synthesis unit comprises a multiplier and a synthesis coefficient memory, the multiplier is used for carrying out synthesis processing on each branch data, and the synthesis coefficient memory is used for storing synthesis coefficients.
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